170 results on '"Singh, RG"'
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2. Change detection of bare areas in the Xolobeni region, South Africa using Landsat NDVI.
- Author
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Singh, RG, primary, Engelbrecht, J, additional, and Kemp, J, additional
- Published
- 2015
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3. Association of PKD1 sequence variants with pathophysiology of ADPKD in Indian patients
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Raj, Sonam, primary, Singh, RG, additional, and Das, Parimal, additional
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- 2014
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4. 003 Urine MCP-1 to diagnose acute renal allograft rejection – a pilot study
- Author
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Behura, SK, primary, Sharatchandra, LK, additional, Ghosh, B, additional, Soni, A, additional, Singh, S, additional, Singh, RG, additional, Prakash, J, additional, and Singh, PB, additional
- Published
- 2010
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5. P8 Antiphospholipid antibody syndrome: a study of 76 patients
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Singh, NK, primary, Singh, MN, additional, Agrawal, A, additional, Pandey, LK, additional, Singh, RG, additional, and Shukla, J, additional
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- 2007
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6. P6 Clinicopathological study and treatment outcome in 31 patients of lupus nephritis
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Singh, MN, primary, Singh, NK, additional, Agrawal, A, additional, Pandey, LK, additional, Singh, RG, additional, and Shukla, J, additional
- Published
- 2007
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7. Urinary MCP-1 as diagnostic and prognostic marker in patients with lupus nephritis flare.
- Author
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Singh, RG, Usha, Rathore, SS, Behura, SK, and Singh, NK
- Subjects
- *
LUPUS nephritis , *BIOPSY , *CREATININE , *KIDNEY disease treatments , *ENZYMES , *MACROPHAGES , *PATIENTS - Abstract
Aim of the study: This study aimed to assess correlation of urinary monocytic chemoattractant protein-1 (UMCP-1) with severity of lupus nephritis and its role as predictor of outcome. Method: Twenty patients with lupus nephritis flare were included in the study. Ten patients in each group of stable systemic lupus erythematosus and non-renal flare were taken as controls. Biopsy was done to define lupus nephritis stage. UMCP-1 levels were measured in all patients at the time of entry and at four and eight weeks of follow-up. Results: Mild, moderate and severe lupus nephritis flare was noted in one, five and 15 patients, respectively. UMCP-1 levels were high in patients with severe lupus nephritis flare (2.74 ± 0.95 ng/mg creatinine) as compared to patients with moderate (1.43 ± 0.46 ng/mg creatinine) and mild lupus nephritis flare (0.76 ± 0.57 ng/mg creatinine) (P = 0.0093). Baseline mean UMCP-1 levels in lupus nephritis flare, non-renal flare and stable SLE patients were 2.32 ± 1.06, 0.171 ± 0.03 and 0.213 ± 0.026 ng/mg creatinine, respectively. The difference among the three groups was very significant (P < 0.001). Also, mean UMCP-1 levels correlated significantly with severity of lupus nephritis class (P = 0.0358). During follow-up, 15 patients achieved complete or partial remission, and in these patients mean UMCP-1 levels had significant decline at eight weeks (P < 0.0001). However, mean UMCP-1 levels in the remaining five non-responders did not show significant changes at four and eight weeks (P = 0.4858). Conclusion: Mean UMCP-1 levels were significantly higher in the lupus nephritis flare group as compared to non-renal flare and stable patients. Baseline mean UMCP-1 levels significantly correlated with both lupus nephritis class and severity of lupus nephritis flare, hence UMCP-1 could be used as a non-invasive marker for the judgement of lupus flare and lupus nephritis class. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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8. P14 Clinico-pathological study and treatment outcome in 51 patients of lupus nephritis with a follow-up of 2 to 4 year
- Author
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Singh, NK, Kumar, V, Singh, MN, Agarwal, A, Usha, and Singh, RG
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- 2008
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9. Efficacy of a yeast postbiotic on cold/flu symptoms in healthy children: A randomized-controlled trial.
- Author
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Singh RG, Garcia-Campayo V, Green JB, Paton N, Saunders JD, Al-Wahsh H, Crowley DC, Lewis ED, Evans M, and Moulin M
- Subjects
- Humans, Child, Female, Male, Child, Preschool, Ontario, Treatment Outcome, Double-Blind Method, Probiotics therapeutic use, Probiotics administration & dosage, Severity of Illness Index, Saccharomyces cerevisiae, Common Cold drug therapy, Influenza, Human prevention & control
- Abstract
Background: Children attending school/daycare are at high risk of acute respiratory tract infections. EpiCor
TM postbiotic, derived from yeast fermentate, has been demonstrated to improve immune function in adults, reducing the incidence of cold/flu-like or allergy symptoms. As such, studies are warranted in children as available pharmaceutical options have unwanted side effects., Methods: Two-hundred and fifty-six children aged 4-12 years attending school/daycare were randomized to either EpiCor or Placebo for 84 days during the 2022-2023 flu season in Ontario, Canada. The Canadian Acute Respiratory Illness and Flu Scale (CARIFS) and study diary assessed the incidence and severity of cold/flu symptoms and the use of cold/flu medications. Adverse events were recorded., Results: Total CARIFS severity scores, 'sore throat' and 'muscle aches or pains' symptom scores in the EpiCor group were significantly lower compared to Placebo during incidences of cold/flu (P ≤ 0.05). Participants taking Placebo were 1.73 times more likely to use cold/flu medication compared to those receiving EpiCor (P = 0.04). The incidence of cold/flu symptoms was not significantly different between groups. EpiCor was found to be safe and well-tolerated., Conclusions: EpiCor supplementation resulted in significantly lower cold/flu symptom severity and less cold/flu medication usage than Placebo demonstrating a beneficial effect on immune function in children., Impact: Children are at high risk of acquiring cold/flu infections and safe and efficacious mitigating regimens are lacking. Children supplemented daily with 500 mg EpiCorTM postbiotic derived from yeast fermentate had significantly lower overall cold/flu symptom severity, and severity of sore throat and muscle aches or pains over the 84-day supplementation period. EpiCor supplementation resulted in decreased use of traditional cold/flu medication. Daily supplementation with 500 mg of EpiCor for 84 days was safe and well tolerated by healthy children aged 4-12 years attending school or daycare., Competing Interests: Competing interests: V.G.C, J.G, N.P, J.D.S. are employees of Cargill Limited c/o Cargill Inc., R.S, M.M, D.C.C, H.A, E.D.L are employees of KGK Science Inc., M.E is a faculty member at Western University. All authors declare no competing interests. Ethical and regulatory approval: This randomized, double-blind, placebo-controlled, parallel study was conducted at KGK Science Inc. (London, Ontario, Canada) from September 2022 to April 2023. The study was reviewed by the Natural and Non-Prescription Health Products Directorate (NNHPD), Health Canada, Ottawa, Ontario and approved on March 03, 2022. Ethics approval was granted on June 17, 2022, by the Institutional Review Board Services (Aurora, Ontario, Canada; Pro00063328). The trial followed CONSORT guidelines for randomized controlled trials20 (Supplementary Table 2) and written informed consent was obtained from all participants prior to the initiation of any study procedures. The study was registered with Clinicaltrials.gov (NCT05492370). Informed consent: Each participant and their parent(s) or legal guardian gave written informed consent to participate in the study., (© 2024. The Author(s).)- Published
- 2024
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10. Endocytic Uptake of Self-Assembled Iridium(III) Nanoaggregates for Holistic Treatment of Metastatic 3D Triple-Negative Breast Tumor Spheroids.
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Chaudhary A, Kumar A, Swain N, Chaudhary K, Sonker H, Dewan S, Patil RA, and Singh RG
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Triple-negative breast cancer (TNBC) presents a formidable challenge due to its aggressive behavior and limited array of treatment options available. This study focuses on employing nanoaggregate material of organometallic Ir(III) complexes for treating TNBC cell line MDA-MB-231. In this approach, Ir(III) complexes with enhanced cellular permeability are strategically designed and achieved through the incorporation of COOMe groups into their structure. The lead compound, IrL
1 , exhibits promiscuous nanoscale aggregation in RPMI cell culture media, characterized by a stable hydrodynamic effective diameter ranging from 190 to 202 nm over 48 h. With excellent photo-responsive contrast-enhanced cell imaging properties IrL1 exhibits an outstanding IC50, 48h value of 36.05± 0.03 nm when irradiated with 390 nm light in MDA-MB-231 (IC50, 48 h of Cisplatin is 5.29 µµ). In cell, investigation confirms that IrL1 nanoaggregates internalization via energy-dependent endocytosis undergo ferroptosis and ROS mediated cell death in MDA-MB-231 cells. Further, these in vivo studies using NOD-SCID mice confirmed that IrL1 exhibits a tendency to ablate tumors inoculated in mice models at therapeutically relevant doses. Thus, this comprehensive approach holds promise for expanding the repertoire of organometallic Ir(III) nanoaggregates with adaptable characteristics, thereby advancing their clinical utility of nanomedicine in the holistic treatment of metastatic 3D triple-negative breast tumor spheroids., (© 2024 Wiley‐VCH GmbH.)- Published
- 2024
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11. Social Media Users' Engagement with Fear Appeal Elements in Government's Health Crisis Communication via State-Owned Media.
- Author
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Yao L, Ngai CSB, Singh RG, and Chen F
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- Humans, State Government, Persuasive Communication, United States, Fear, COVID-19 prevention & control, Social Media statistics & numerical data, Health Communication methods
- Abstract
Government health messaging is significant to the containment of public health crises. Such communication may benefit from using fear appeal, a message strategy for promoting health and preventing diseases. Yet little scholarly attention has been paid to how fear appeal is employed in government messaging to promote social media engagement through online actions including likes, shares, and comments. These actions play a meaningful role in addressing communication exigencies within the context of health crises. In this study, quantitative content analysis and corpus linguistics methods were employed to analyze fear appeal-related elements in COVID-19 messages sent by a state-owned media outlet on social media. The results show that when compared to messages without threat, messages conveying threat elicited significantly more comments, in which emotions and perceptions to threat and efficacy were exhibited, while messages containing both threat and efficacy generated more engagement in comparison to messages with threat alone. Moreover, while subdimensions under efficacy were positive predictors of engagement, those under threat were primarily found to have exerted negative effects. The findings provide insights into how fear appeal elements can be employed in government health crisis communication to engage the public.
- Published
- 2024
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12. Pyridine-2,6-Dicarboxamide Proligands and their Cu(II)/Zn(II) Complexes Targeting Staphylococcus Aureus for the Attenuation of In Vivo Dental Biofilm.
- Author
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Chaudhary K, Agrahari B, Biswas B, Chatterjee N, Chaudhary A, Kumar A, Sonker H, Dewan S, Saxena D, Akhir A, Malhotra N, Chopra S, Misra S, Matheswaran S, and Singh RG
- Subjects
- Animals, Rats, Coordination Complexes chemistry, Coordination Complexes pharmacology, Staphylococcal Infections drug therapy, Ligands, Rats, Sprague-Dawley, Biofilms drug effects, Staphylococcus aureus drug effects, Anti-Bacterial Agents pharmacology, Anti-Bacterial Agents chemistry, Zinc chemistry, Zinc pharmacology, Copper chemistry, Copper pharmacology, Microbial Sensitivity Tests, Pyridines chemistry, Pyridines pharmacology
- Abstract
In the pursuit to combat stubborn bacterial infections, particularly those stemming from gram-positive bacteria, this study is an attempt to craft a precision-driven platform characterized by unparalleled selectivity, specificity, and synergistic antimicrobial mechanisms. Leveraging remarkable potential of metalloantibiotics in antimicrobial applications, herein, this work rationally designs, synthesizes, and characterizes a new library of Pyridine-2,6-dicarboxamide ligands and their corresponding transition metal Cu(II)/Zn(II) complexes. The lead compound L
11 demonstrates robust antibacterial properties against Staphylococcus aureus (Minimum Inhibitory Concentration (MIC) = 2-16 µg mL-1 ), methicillin and vancomycin-resistant S. aureus (MIC = 2-4 µg mL-1 ) and exhibit superior antibacterial activity when compared to FDA-approved vancomycin, the drug of last resort. Additionally, the compound exhibits notable antimicrobial efficacy against resistant enterococcus strains (MIC = 2-8 µg mL-1 ). To unravel mechanistic profile, advanced imaging techniques including SEM and AFM are harnessed, collectively suggesting a mechanistic pathway involving cell wall disruption. Live/dead fluorescence studies further confirm efficacy of L11 and its complexes against S. aureus membranes. This translational exploration extends to a rat model, indicating promising in vivo therapeutic potential. Thus, this comprehensive research initiative has capabilities to transcends the confines of this laboratory, heralding a pivotal step toward combatting antibiotic-resistant pathogens and advancing the frontiers of metalloantibiotics-based therapy with a profound clinical implication., (© 2024 Wiley‐VCH GmbH.)- Published
- 2024
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13. Efficacy of Pea Protein Supplementation in Combination with a Resistance Training Program on Muscle Performance in a Sedentary Adult Population: A Randomized, Comparator-Controlled, Parallel Clinical Trial.
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Singh RG, Guérin-Deremaux L, Lefranc-Millot C, Perreau C, Crowley DC, Lewis ED, Evans M, and Moulin M
- Subjects
- Humans, Male, Female, Adult, Whey Proteins administration & dosage, Middle Aged, Young Adult, Body Composition, Hand Strength, Resistance Training, Dietary Supplements, Pea Proteins administration & dosage, Sedentary Behavior, Muscle Strength physiology, Muscle, Skeletal physiology
- Abstract
Animal-sourced whey protein (WPr) is the most popular protein supplement among consumers and has been shown to improve muscle mass and strength. However, due to allergies, dietary restrictions/personal choices, and growing demand, alternative protein sources are warranted. Sedentary adults were randomized to pea protein (PPr) or WPr in combination with a weekly resistance training program for 84 days. Changes in whole-body muscle strength (WBMS) including handgrip, lower body, and upper body strength, body composition, and product perception were assessed. The safety outcomes included adverse events, vital signs, clinical chemistry, and hematology. There were no significant differences in the change in WBMS, muscle mass, or product perception and likability scores between the PPr and WPr groups. The participants supplemented with PPr had a 16.1% improvement in WBMS following 84 days of supplementation ( p = 0.01), while those taking WPr had an improvement of 11.1% ( p = 0.06). Both study products were safe and well-tolerated in the enrolled population. Eighty-four days of PPr supplementation resulted in improvements in strength and muscle mass comparable to WPr when combined with a resistance training program in a population of healthy sedentary adults. PPr may be considered as a viable alternative to animal-sourced WPr without sacrificing muscular gains and product enjoyment.
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- 2024
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14. Zinc(II) Complexes of SIRTi1/2 Analogues Transmetallating with Copper Ions and Inducing ROS Mediated Paraptosis.
- Author
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Kumar A, Chaudhary A, Sonker H, Subhadarshini S, Jolly MK, and Singh RG
- Abstract
As the SIRT i analogue series (HL1-HL6) show potent antitumor activity in vitro, we synthesized their corresponding zinc(II) complexes (ZnL1-ZnL6) and investigated their potential as anticancer agents. The Zn(II) complexes showed substantially greater cytotoxicity than HL1-HL6 alone in several cancer cell-types. Notably, distinct structure-activity relationships confirmed the significance of tert -butyl (ZnL2) pharmacophore inclusion in their activity. ZnL2 complexes were found to transmetalate with copper ions inside cells, causing the formation of redox-active copper complexes that induced reactive oxygen species (ROS) production, mitochondrial membrane depolarization, ATP decay, and cell death. This is the first study to exhibit Zn(II) complexes that mediate their activity via transmetalation with copper ions to undergo paraptosis cell death pathway. To further confirm if the SIRT1/2 inhibitory property of SIRTi analogues is conserved, a docking simulation study is performed. The binding affinity and specific interactions of the Cu(II) complex obtained after transmetalation with ZnL2 were found to be higher for SIRT2 ( K
i = 0.06 μM) compared to SIRT1 ( Ki = 0.25 μM). Thus, the concurrent regulation of several biological targets using a single drug has been shown to have synergistic therapeutic effects, which are crucial for the effective treatment of cancer., Competing Interests: The authors declare no competing financial interest., (© 2024 The Authors. Published by American Chemical Society.)- Published
- 2024
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15. Concurrent Cu(II)-initiated Fenton-like reaction and glutathione depletion to escalate chemodynamic therapy.
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Kumar A, Chaudhary A, Agrahari B, Chaudhary K, Kumar P, and Singh RG
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- Cell Line, Tumor, Glutathione metabolism, Hydrogen Peroxide
- Abstract
Chemodynamic therapy is an evolving therapeutic strategy but there are certain limitations associated with its treatment. Herein, we present de novo synthesis and mechanistic evaluation of HL1-HL8 ligands and their corresponding Cu
II (L1)2 -CuII (L8)2 . The most active Cu(L2)2 (IC50 = 5.3 μM, MCF-7) complex exclusively depletes glutathione while simultaneously promoting ROS production. Cu(L2)2 also affects other macromolecules like the mitochondrial membrane and DNA while activating the unfolded protein response cascade.- Published
- 2023
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16. Exploring the Relationship Between Trust-Building Strategies and Public Engagement on Social Media During the COVID-19 Outbreak.
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Ngai CSB, Singh RG, Lu W, Yao L, and Koon AC
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- Humans, SARS-CoV-2, Trust, Disease Outbreaks, COVID-19 epidemiology, COVID-19 psychology, Social Media, Health Communication
- Abstract
Communication is critical in a new health emergency because it motivates the public to take preventive actions. Prior research has shown that strategies including source credibility, information transparency and uncertainty reduction actions could enhance trust in health communication on social media. Yet research on how the government in China used these trust-building strategies to engage the public during the outbreak of COVID-19 is limited. Therefore, our exploratory study developed an integrated framework for conducting quantitative content analysis to examine how the most popular government-owned newspaper in China, People's Daily , utilized a major social media platform, to engage the public. Our findings showed that accessibility to external links, provision of emotional support, and information on skills and resources were associated with increased public engagement with government COVID-19 posts. Insights gained can enable public health organizations and governments to focus on specific strategies to enhance public engagement.
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- 2023
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17. Effect of thermocycling on the mechanical properties, inorganic particle release and low temperature degradation of glazed high translucent monolithic 3Y-TZP dental restorations.
- Author
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Singh RG, Lyons KM, Waddell JN, and Li KC
- Subjects
- Materials Testing, Temperature, Cold Temperature, Surface Properties, Dental Materials, Yttrium chemistry, Ceramics chemistry, Zirconium chemistry, Flexural Strength
- Abstract
The influence of thermocycling on the surface deterioration of glazed monolithic high translucent 3Y-TZP dental restorations is still unclear. The purpose of this study therefore was to evaluate low temperature degradation (LTD), elemental release and surface degradation pattern after five years of simulated clinical time. A total of 123 specimens were prepared from second-generation high translucent 3Y-TZP as per ISO 6872:2015 standards (3 mm × 4 mm × 30 mm). They were classified as per glazing and thermocycling protocol; group CPT, DGT and IGT. Glaze materials were applied on one surface of the specimen and subjected to a thermocycling in artificial saliva, four-point bending test, inductively coupled plasma mass spectrometry (ICP-MS), scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX) and x-ray diffraction (XRD). Flexural strength, characteristic strength and Weibull modulus values were derived from four-point bending test. Descriptive fractographic analysis of surfaces was conducted to observe the surface degradation characteristics and point of failure. Control/no glaze with thermocycling (CPT = 621.5, 1σ = 117.0 MPa) presented higher flexural strength values compared to glaze I with thermocycling (442.4, 1σ = 45.4 MPa) and glaze II with thermocycling (534.3, 1σ = 46.3 MPa). Characteristic strength from Weibull analysis also observed higher values (669.2 MPa) for the control specimens. XRD analysis showed that monoclinic volume fraction (V
m = 11.0, 1σ = 0.7%) was highest in control specimens. Fractographic analysis suggested that there was no correlation between the point of failure initiation and mean flexural strength values. Glazing protected the high translucent 3Y-TZP surface against LTD during thermocycling but negatively impacted on the flexural strength., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2022 Elsevier Ltd. All rights reserved.)- Published
- 2022
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18. Impact of COVID-19 Vaccine Misinformation on Social Media Virality: Content Analysis of Message Themes and Writing Strategies.
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Ngai CSB, Singh RG, and Yao L
- Subjects
- COVID-19 Vaccines therapeutic use, Communication, Humans, Writing, COVID-19 prevention & control, Social Media
- Abstract
Background: Vaccines serve an integral role in containing pandemics, yet vaccine hesitancy is prevalent globally. One key reason for this hesitancy is the pervasiveness of misinformation on social media. Although considerable research attention has been drawn to how exposure to misinformation is closely associated with vaccine hesitancy, little scholarly attention has been given to the investigation or robust theorizing of the various content themes pertaining to antivaccine misinformation about COVID-19 and the writing strategies in which these content themes are manifested. Virality of such content on social media exhibited in the form of comments, shares, and reactions has practical implications for COVID-19 vaccine hesitancy., Objective: We investigated whether there were differences in the content themes and writing strategies used to disseminate antivaccine misinformation about COVID-19 and their impact on virality on social media., Methods: We constructed an antivaccine misinformation database from major social media platforms during September 2019-August 2021 to examine how misinformation exhibited in the form of content themes and how these themes manifested in writing were associated with virality in terms of likes, comments, and shares. Antivaccine misinformation was retrieved from two globally leading and widely cited fake news databases, COVID Global Misinformation Dashboard and International Fact-Checking Network Corona Virus Facts Alliance Database, which aim to track and debunk COVID-19 misinformation. We primarily focused on 140 Facebook posts, since most antivaccine misinformation posts on COVID-19 were found on Facebook. We then employed quantitative content analysis to examine the content themes (ie, safety concerns, conspiracy theories, efficacy concerns) and manifestation strategies of misinformation (ie, mimicking of news and scientific reports in terms of the format and language features, use of a conversational style, use of amplification) in these posts and their association with virality of misinformation in the form of likes, comments, and shares., Results: Our study revealed that safety concern was the most prominent content theme and a negative predictor of likes and shares. Regarding the writing strategies manifested in content themes, a conversational style and mimicking of news and scientific reports via the format and language features were frequently employed in COVID-19 antivaccine misinformation, with the latter being a positive predictor of likes., Conclusions: This study contributes to a richer research-informed understanding of which concerns about content theme and manifestation strategy need to be countered on antivaccine misinformation circulating on social media so that accurate information on COVID-19 vaccines can be disseminated to the public, ultimately reducing vaccine hesitancy. The liking of COVID-19 antivaccine posts that employ language features to mimic news or scientific reports is perturbing since a large audience can be reached on social media, potentially exacerbating the spread of misinformation and hampering global efforts to combat the virus., (©Cindy Sing Bik Ngai, Rita Gill Singh, Le Yao. Originally published in the Journal of Medical Internet Research (https://www.jmir.org), 06.07.2022.)
- Published
- 2022
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19. A Digital Asset Inheritance Model to Convey Online Persona Posthumously.
- Author
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Singh RG, Shrivastava A, and Ruj S
- Abstract
The astounding growth of the Internet has generated digital asset extensively. Users are concerned about asset management so that the asset can be conveyed successfully to the descendent posthumously. Very few works have addressed designing and modeling of digital asset inheritance (DAI) from a technical design perspective. They have several inherent limitations such as incorrect death confirmation, high participation of nominee, the possibility of failure to obtain recovery key, and are based on many unreasonable assumptions, thus inefficient to design in the real life. In this paper, we have formalized the different categories of digital assets and defined the various security goals, required functionalities, and necessary entities to build an asset inheritance model. We have also proposed a new protocol named digital asset inheritance protocol (DAIP) using certificateless encryption (CLE) and identity-based system (IBS) to convey the user's online persona efficiently to the descendent after his death. DAIP allows the nominee to successfully retrieve the asset after the user's demise, even if a nominee is uninformed regarding the asset. We, then, provide rigorous security proofs of various properties using real-ideal worlds paradigm. Finally, we have implemented DAIP model using PBC and pycryptodome library. The simulation results affirm that it can be practically efficient to implement., Competing Interests: Conflicts of interestNot applicable., (© The Author(s), under exclusive licence to Springer-Verlag GmbH, DE 2022.)
- Published
- 2022
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20. Association between Intrapancreatic Fat Deposition and the Leptin/Ghrelin Ratio in the Fasted and Postprandial States.
- Author
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Nguyen NN, Singh RG, and Petrov MS
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- Adult, Aged, Female, Humans, Magnetic Resonance Imaging, Middle Aged, Postprandial Period physiology, Fasting metabolism, Ghrelin metabolism, Leptin metabolism
- Abstract
Background: The clinical relevance of excess intrapancreatic fat deposition (IPFD) is increasingly appreciated. Leptin and ghrelin are key players in the regulation of food intake, energy balance, and body fat mass. The aim was to investigate the associations of the leptin/ghrelin ratio and its components with IPFD., Methods: All participants underwent magnetic resonance imaging on a 3T scanner to quantify IPFD. Both fasting and postprandial blood samples were analyzed for leptin and acylated ghrelin. Linear regression analysis was conducted, accounting for visceral/subcutaneous fat volume ratio, glycated hemoglobin, and other covariates., Results: A total of 94 participants (32 women) with a median age of 56 (interquartile range 44-66) years were studied. Their median IPFD was 9.6% (interquartile range 8.8-10.4%). In the fasted state, the leptin/ghrelin ratio (β = 0.354; 95% confidence interval 0.044-0.663; p = 0.025, in the most adjusted model) and leptin (β = 0.040; 95% confidence interval 1.003-1.078; p = 0.035, in the most adjusted model) were significantly associated with IPFD. Ghrelin in the fasted state was not significantly associated with IPFD. In the postprandial state, the leptin/ghrelin ratio, leptin, and ghrelin were not significantly associated with IPFD., Conclusion: Fasting circulating levels of leptin are directly associated with IPFD. Purposely designed mechanistic studies are warranted to determine how high leptin may contribute to excess IPFD., (© 2021 The Author(s). Published by S. Karger AG, Basel.)
- Published
- 2022
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21. Effect of Two Brands of Glaze Material on the Flexural Strength and Probability of Failure of High Translucent Monolithic Zirconia.
- Author
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Singh RG, Li KC, Lyons KM, and Waddell JN
- Abstract
(1) Background: The effect of glazing on the mechanical properties of monolithic high translucent zirconia is not well reported. Therefore, the purpose of this study was to evaluate the effect of glazing on the flexural strength of high translucent zirconia; (2) Methods: Ninety specimens were prepared from second-generation 3Y-TZP high translucent blocks and divided into three groups. Glaze materials were applied on one surface of the specimen and subjected to a four-point bending test and flexural stress and flexural displacement values were derived. Descriptive fractographic analysis of surfaces was conducted to observe the point of failure and fracture pattern.; (3) Results: Control-nonglazed (647.17, 1σ = 74.71 MPa) presented higher flexural strength values compared to glaze I (541.20, 1σ = 82.91 MPa) and glaze II (581.10, 1σ = 59.41 MPa). Characteristic strength (σ
Ɵ ) from Weibull analysis also observed higher (660.67 MPa) values for the control specimens. Confocal microscopy revealed that glazed surfaces were much rougher than control surfaces. Descriptive fractographic analysis revealed that there was no correlation between the point of failure initiation and flexural strength; (4) Conclusions: The test results demonstrated that glazing significantly decreased the flexural strength and flexural displacement of the zirconia specimens.- Published
- 2021
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22. Exploring drivers for public engagement in social media communication with medical social influencers in China.
- Author
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Ngai CSB, Singh RG, and Lu W
- Subjects
- China, Humans, Communication, Social Media, Stakeholder Participation
- Abstract
Social networking sites offer an important means for increasing the accessibility and enabling new forms of health communication between the public and medical social influencers (MSIs). MSIs have a social presence and are perceived as a credible source of health-related information. A research gap, however, exists in understanding the communication strategies employed by MSIs and the factors driving the public to engage in health communication with MSIs. This study, therefore, developed a new conceptual framework incorporating health communication, dialogic and interpersonal communication by employing quantitative content analysis to examine public engagement with MSI communication on the largest microblogging site in China, Sina Weibo. The analysis yielded insights into how the usefulness of health-related information provided alongside the interactive dialogue and affective practices played an active role in engaging the public. The public sought health-related information primarily to address issues of concern for well-being and a high level of engagement in terms of online shares, likes, and comments was found. The use of multimedia made the site more appealing, resulting in likes while the expression of emotions by MSIs generated likes and comments. The need to connect with other online users and have a sense of community was reflected in engagement through sharing useful MSI posts by the public. By identifying influential MSIs on social networking sites, health information providers such as organizations and the government can raise awareness of health issues to foster a healthy lifestyle and contribute to better living in the community., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2020
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23. Associations between ketone bodies and fasting plasma glucose in individuals with post-pancreatitis prediabetes.
- Author
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Bharmal SH, Pendharkar SA, Singh RG, Cameron-Smith D, and Petrov MS
- Subjects
- Adult, Aged, Biomarkers metabolism, Cross-Sectional Studies, Cytokines metabolism, Female, Humans, Insulin Resistance, Lipid Metabolism, Male, Middle Aged, Prediabetic State blood, Blood Glucose metabolism, Fasting blood, Ketone Bodies metabolism, Pancreatitis complications, Prediabetic State complications, Prediabetic State metabolism
- Abstract
Context: Levels of ketone bodies are altered in both acute pancreatitis and type 1 and type 2 diabetes. However, the role of ketone bodies in the pathogenesis of abnormal glucose metabolism after pancreatitis is largely unknown. Objective: To investigate the associations between ketone bodies and glucose homeostasis in individuals with post-pancreatitis prediabetes (PPP) versus normoglycaemia after pancreatitis (NAP). Methods: Fasting blood samples were analysed for acetoacetate, β -hydroxybutyrate, and markers of glucose metabolism at a median of 26 months after acute pancreatitis. A series of linear regression analyses were conducted adjusting for patient- and pancreatitis-related characteristics. Results: The study included 27 individuals with PPP and 52 with NAP. β -hydroxybutyrate was significantly associated with fasting plasma glucose ( p = .002) and explained 26.2% of its variance in PPP, but not in NAP ( p = .814; 0%). Acetoacetate was not significantly associated with fasting plasma glucose in both PPP ( p = .681) or NAP ( p = .661). Conclusions: An inverse association between β -hydroxybutyrate and fasting plasma glucose characterises PPP and this may have translational implications.
- Published
- 2020
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24. Grappling With the COVID-19 Health Crisis: Content Analysis of Communication Strategies and Their Effects on Public Engagement on Social Media.
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Ngai CSB, Singh RG, Lu W, and Koon AC
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- COVID-19, Humans, Pandemics, SARS-CoV-2, Betacoronavirus pathogenicity, Coronavirus pathogenicity, Coronavirus Infections epidemiology, Health Communication methods, Pneumonia, Viral epidemiology, Social Media trends
- Abstract
Background: The coronavirus disease (COVID-19) has posed an unprecedented challenge to governments worldwide. Effective government communication of COVID-19 information with the public is of crucial importance., Objective: We investigate how the most-read state-owned newspaper in China, People's Daily, used an online social networking site, Sina Weibo, to communicate about COVID-19 and whether this could engage the public. The objective of this study is to develop an integrated framework to examine the content, message style, and interactive features of COVID-19-related posts and determine their effects on public engagement in the largest social media network in China., Methods: Content analysis was employed to scrutinize 608 COVID-19 posts, and coding was performed on three main dimensions: content, message style, and interactive features. The content dimension was coded into six subdimensions: action, new evidence, reassurance, disease prevention, health care services, and uncertainty, and the style dimension was coded into the subdimensions of narrative and nonnarrative. As for interactive features, they were coded into links to external sources, use of hashtags, use of questions to solicit feedback, and use of multimedia. Public engagement was measured in the form of the number of shares, comments, and likes on the People's Daily's Sina Weibo account from January 20, 2020, to March 11, 2020, to reveal the association between different levels of public engagement and communication strategies. A one-way analysis of variance followed by a post-hoc Tukey test and negative binomial regression analysis were employed to generate the results., Results: We found that although the content frames of action, new evidence, and reassurance delivered in a nonnarrative style were predominant in COVID-19 communication by the government, posts related to new evidence and a nonnarrative style were strong negative predictors of the number of shares. In terms of generating a high number of shares, it was found that disease prevention posts delivered in a narrative style were able to achieve this purpose. Additionally, an interaction effect was found between content and style. The use of a narrative style in disease prevention posts had a significant positive effect on generating comments and likes by the Chinese public, while links to external sources fostered sharing., Conclusions: These results have implications for governments, health organizations, medical professionals, the media, and researchers on their epidemic communication to engage the public. Selecting suitable communication strategies may foster active liking and sharing of posts on social media, which in turn, might raise the public's awareness of COVID-19 and motivate them to take preventive measures. The sharing of COVID-19 posts is particularly important because this action can reach out to a large audience, potentially helping to contain the spread of the virus., (©Cindy Sing Bik Ngai, Rita Gill Singh, Wenze Lu, Alex Chun Koon. Originally published in the Journal of Medical Internet Research (http://www.jmir.org), 24.08.2020.)
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- 2020
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25. Trajectories of glycaemia following acute pancreatitis: a prospective longitudinal cohort study with 24 months follow-up.
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Bharmal SH, Cho J, Alarcon Ramos GC, Ko J, Stuart CE, Modesto AE, Singh RG, and Petrov MS
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- Adult, Aged, Cohort Studies, Female, Follow-Up Studies, Humans, Incidence, Longitudinal Studies, Male, Middle Aged, Prospective Studies, Time Factors, Waist Circumference physiology, Blood Glucose metabolism, Diabetes Mellitus epidemiology, Pancreatitis complications, Prediabetic State epidemiology
- Abstract
Background: New-onset diabetes is the most common sequela of acute pancreatitis (AP). Yet, prospective changes in glycaemia over time have never been investigated comprehensively in this study population. The primary aim was to determine the cumulative incidence of new-onset prediabetes and new-onset diabetes after AP over 24 months of follow-up in a prospective cohort study. The secondary aim was to identify trajectories of glycaemia during follow-up and their predictors at the time of hospitalisation., Methods: Patients with a prospective diagnosis of AP and no diabetes based on the American Diabetes Association criteria were followed up every 6 months up to 24 months after hospital discharge. Incidence of new-onset prediabetes/diabetes over each follow-up period was calculated. Group-based trajectory modelling was used to identify common changes in glycaemia. Multinomial regression analyses were conducted to investigate the associations between a wide array of routinely available demographic, anthropometric, laboratory, imaging, and clinical factors and membership in the trajectory groups., Results: A total of 152 patients without diabetes were followed up. The cumulative incidence of new-onset prediabetes and diabetes was 20% at 6 months after hospitalisation and 43% over 24 months of follow-up (p trend < 0.001). Three discrete trajectories of glycaemia were identified: normal-stable glycaemia (32%), moderate-stable glycaemia (60%), and high-increasing glycaemia (8%). Waist circumference was a significant predictor of moderate-stable glycaemia. None of the studied predictors were significantly associated with high-increasing glycaemia., Conclusions: This first prospective cohort study of changes in glycaemia (determined at structured time points in unselected AP patients) showed that at least one out of five patients develops new-onset prediabetes or diabetes at 6 months of follow-up and more than four out of ten-in the first 2 years. Changes in glycaemia after AP follow three discrete trajectories. This may inform prevention or early detection of critical changes in blood glucose metabolism following an attack of AP and, hence, reduce the burden of new-onset diabetes after acute pancreatitis.
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- 2020
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26. Implications of Tobacco Smoking and Alcohol Consumption on Ectopic Fat Deposition in Individuals After Pancreatitis.
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Stuart CE, Ko J, Modesto AE, Alarcon Ramos GC, Bharmal SH, Cho J, Singh RG, and Petrov MS
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- Adiposity, Adult, Aged, Cross-Sectional Studies, Humans, Magnetic Resonance Imaging methods, Male, Middle Aged, Pancreas diagnostic imaging, Pancreas metabolism, Pancreas pathology, Pancreatitis diagnostic imaging, Risk Assessment methods, Risk Factors, Adipose Tissue metabolism, Alcohol Drinking physiopathology, Pancreatitis metabolism, Tobacco Smoking physiopathology
- Abstract
Objectives: Tobacco smoking and alcohol consumption are established risk factors for pancreatitis. This study investigated the associations between tobacco smoking/alcohol consumption in people after an attack of pancreatitis and intrapancreatic fat deposition (IPFD), intrahepatic fat deposition (IHFD), and skeletal muscle (SMFD) fat deposition., Methods: In this cross-sectional study, magnetic resonance imaging was used to quantify IPFD, IHFD, and SMFD by 2 independent raters. A validated questionnaire was used to determine tobacco smoking and alcohol consumption., Results: A total of 119 individuals after an attack of pancreatitis were included. Average tobacco smoking contributed most to variance in IPFD (R = 6.5%) and least to variance in SMFD (R = 0.4%). Average alcohol consumption contributed most to variance in variance in IPFD (R = 2.8%) and least to IHFD (R = 1.1%). Packs/day contributed more than years of smoking to variance in IPFD (R = 4.9 and 0.2%, correspondingly), whereas years of drinking contributed more than average daily alcohol consumption (R = 3.9 and 3.2%, correspondingly)., Conclusions: Tobacco smoking and alcohol consumption contributed more to variance in IPFD than IHFD and SMFD. Smoking contributed more than drinking to variance in IPFD. The daily amount of tobacco smoked appeared to be more important than years of smoking for IPFD.
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- 2020
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27. Multidisciplinary Consensus Document on the Management of Uncontrolled Hypertension in India.
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Padmanabhan R, Singh RG, Unni G, Desai B, Hiremath SK, Jain V, Bhawal S, Gulati S, Shete M, Nair R, Prakash S, Kher V, and Bhattacharya B
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- Algorithms, Antihypertensive Agents adverse effects, Clinical Decision-Making, Comorbidity, Consensus, Decision Support Techniques, Disease Progression, Drug Resistance, Humans, Hypertension diagnosis, Hypertension epidemiology, Hypertension physiopathology, India epidemiology, Prevalence, Risk Factors, Treatment Outcome, Antihypertensive Agents therapeutic use, Blood Pressure drug effects, Hypertension therapy, Risk Reduction Behavior
- Abstract
Cardiovascular disease is predicted to be the largest cause of death and disability in India by 2020. Hypertension (HT), one of the main contributing factors, presents a significant public health burden. Inability to achieve adequate blood pressure (BP) control results in uncontrolled hypertension (UHT). The prevalence of UHT is high in India, with only about 9-20% of patients achieving target BP goals. Presently, there are no guidelines specific to UHT, which if left uncontrolled can lead to resistant HT, chronic kidney disease and other complications of HT. A multidisciplinary panel, comprising of specialists in cardiology, nephrology and internal medicine, was convened to address the diagnosis and management of UHT in the Indian population. The panel identified key points concerning UHT and discussed management recommendations in the Indian clinical setting.
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- 2020
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28. Psoas muscle size as a magnetic resonance imaging biomarker of progression of pancreatitis.
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Modesto AE, Stuart CE, Cho J, Ko J, Singh RG, and Petrov MS
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- Aged, Biomarkers, Cross-Sectional Studies, Disease Progression, Female, Humans, Male, Middle Aged, Organ Size, Pancreas pathology, Magnetic Resonance Imaging methods, Pancreatitis pathology, Psoas Muscles diagnostic imaging, Psoas Muscles pathology
- Abstract
Objective: Pancreatitis often represents a continuous inflammatory process, from the first episode of acute pancreatitis (FAP) to recurrent acute pancreatitis (RAP) to chronic pancreatitis (CP). Psoas muscle size is a validated surrogate for global skeletal mass, changes in which are associated with inflammation. The objective was to investigate psoas muscle size in individuals following FAP, RAP, and CP, as well as its associations with pro-inflammatory cytokines., Methods: Individuals following pancreatitis and healthy individuals were recruited. All participants underwent magnetic resonance imaging, from which psoas muscle volume was derived independently by two raters in a blinded fashion. Circulating levels of four major cytokines (interleukin-6, tumour necrosis factor-α, C-C motif chemokine ligand 2, and leptin) were measured. Five linear regression additive models were built to adjust for possible confounders (age, sex, body composition, physical activity, tobacco smoking, alcohol consumption, comorbidities, and endocrine and exocrine pancreatic functions)., Results: A total of 145 participants were enrolled. A significant downward trend in psoas muscle volume was observed between healthy controls and individuals following FAP, RAP, and CP in all adjusted models (p = 0.047, 0.005, 0.004, and < 0.001). Leptin was significantly associated with psoas muscle volume in all models (β = - 0.16, p = 0.030 in the most adjusted model). The other studied cytokines were not significantly associated with psoas muscle volume., Conclusions: Psoas muscle size is significantly reduced along the continuum from FAP to RAP to CP. Leptin appears to be one of the factors implicated in this. Further studies are warranted to investigate the relationship between skeletal muscle and inflammation of the pancreas., Key Points: • First acute pancreatitis, recurrent acute pancreatitis, and chronic pancreatitis were associated with progressively reduced psoas muscle size. • The findings were independent of age, sex, body fat composition, physical activity, tobacco smoking, alcohol consumption, comorbidities, and exocrine and endocrine functions of the pancreas. • The mechanism underlying the observed findings may involve hyperleptinaemia.
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- 2020
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29. Mutational screening of PKD1 and PKD2 in Indian ADPKD patients identified 95 genetic variants.
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Raj S, Singh RG, and Das P
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- Adult, Case-Control Studies, DNA Mutational Analysis, Female, Humans, India epidemiology, Male, Pedigree, Mutation, Polycystic Kidney, Autosomal Dominant epidemiology, Polycystic Kidney, Autosomal Dominant genetics, TRPP Cation Channels genetics
- Abstract
Background: Mutation screening of autosomal dominant polycystic kidney disease (ADPKD) cases imply the major involvement of PKD1 mutations in 85% of patients while rest of the cases harbor mutation in PKD2, DNAJB11 and GANAB. This essentially indicates that individual's genotype holds the key for disease susceptibility and its severity., Methods: For finding genetic variability underlying the disease pathophysiology, 84 Indian ADPKD cases, 31 family members (12 susceptible) and 122 age matched control were screened for PKD1 and PKD2 using Sanger sequencing, PCR-RFLP and ARMS-PCR., Results: Genetic screening of Indian ADPKD cases revealed total 67 variants in PKD1 and 28 variants in PKD2. Among the identified variants in PKD1 and PKD2 genes, 35.79% were novel variants and 64.2% recurrent. Further, subcategorization of PKD1 variants showed 14 truncation/frameshift, 21 nonsynonymous, 25 synonymous and 7 intronic variants. Moreover, we observed 40 families with PKD1 pathogenic variants, 7 families with PKD2 pathogenic variants, 9 families with PKD1 & PKD2 pathogenic variants, and 26 families with PKD1/PKD2/PKD1-PKD2 non-pathogenic genetic variants., Conclusion: Present study represented genetic background of Indian ADPKD cases which will be helpful in disease management as well as finding the genetically matched donor for kidney transplant., (Copyright © 2020 Elsevier B.V. All rights reserved.)
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- 2020
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30. Relationship between persuasive metadiscoursal devices in research article abstracts and their attention on social media.
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Ngai CS and Singh RG
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- Bibliometrics, Humans, Linguistics, Abstracting and Indexing methods, Attention, Persuasive Communication, Publications statistics & numerical data, Social Media
- Abstract
Research article abstracts often convince readers that the article is worth reading. Therefore, they rely not only on the quality of arguments or novelty of findings to persuade readers but also linguistic markers in the form of metadiscourse to assert a position on an issue, increase readability of a text, engage readers, and avoid objection to the writer's interpretations, thereby enhancing the credibility of the text. Given that research article abstracts are often published online and their newsworthiness would affect whether they would be ultimately read, Altmetric.com, which emerged in 2010, can help quantify the popularity of research article abstracts by counting views on social media and other platforms such as news and policy documents. Yet a study on how metadiscoursal devices are used to persuade readers, and how they are correlated with Altmetric Attention Score (AAS) provided by Altmetric.com, merits attention. In our study, we examined 241 abstracts from 50 top journals in 12 disciplines with the highest AAS from 2014-2018 and performed a quantitative analysis of the interactive and interactional metadiscourse markers exhibited in the abstracts. Overall, we found a positive correlation between the use of metadiscourse and AAS. Furthermore, we noticed that each discipline used distinct metadiscourse markers in abstracts with high AAS, which contributed to its respective discipline-specific conventions. It has been previously shown that the use of an array of interactive and interactional metadiscourse renders the abstract more worthy of attention. Being knowledgeable of rhetorical choices in relation to metadiscoursal devices will enable writers to construct more persuasive abstracts by making informed judgments about the appropriate use of metadiscourse to draw the attention of readers in their respective disciplines., Competing Interests: The authors have declared that no competing interests exist.
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- 2020
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31. Pancreatic Hormone Responses to Mixed Meal Test in New-onset Prediabetes/Diabetes After Non-necrotizing Acute Pancreatitis.
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Pendharkar SA, Singh RG, Bharmal SH, Drury M, and Petrov MS
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- Acute Disease, Blood Glucose, Humans, Insulin, Pancreatic Hormones, Diabetes Mellitus, Type 2, Insulin Resistance, Pancreatitis diagnosis, Pancreatitis etiology, Prediabetic State diagnosis
- Abstract
Aim: To investigate the pancreatic hormone responses to mixed meal test, in particular changes in insulin secretion, insulin sensitivity, and their interrelationship, in individuals with new-onset prediabetes or diabetes after non-necrotizing acute pancreatitis (NODAP) compared with healthy controls., Methods: Twenty-nine individuals with NODAP and 29 age-and sex-matched healthy controls were recruited. All participants (after fasting for at least 8 h) were given 12 oz. of BOOST drink and blood samples were collected before and after stimulation to measure insulin, C-peptide, glucagon, and pancreatic polypeptide. Indices of insulin sensitivity (HOMA-IS, 1/fasting insulin, Raynaud, and Matsuda) and insulin secretion (HOMA-β, Stumvoll, insulinogenic index 30' and 60') were calculated. Repeated measures analyses were conducted in the unadjusted and adjusted models., Results: Insulin and C-peptide levels were significantly higher in individuals with NODAP compared with controls during mixed meal test in both the unadjusted (P=0.001 for both) and adjusted (P=0.004 and P=0.006, respectively) models. HOMA-IS (P=0.005), 1/fasting insulin (P=0.018), Raynaud index (P=0.018), and Matsuda index (P=0.021) were significantly lower in individuals with NODAP, whereas HOMA-β (P=0.028) and Stumvoll index (P=0.013) were significantly higher. Glucagon and pancreatic polypeptide levels did not differ significantly between NODAP and controls during mixed meal test in both the unadjusted (P=0.345 and P=0.206, respectively) and adjusted (P=0.359 and P=0.158, respectively) models., Conclusions: Decreased insulin sensitivity, β-cell compensation, and no significant change in postprandial levels of glucagon and pancreatic polypeptide characterize NODAP. The above findings may help develop an evidence-based protocol with a view to optimize control of glucose homeostasis in NODAP.
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- 2020
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32. Relationship of pancreas volume to tobacco smoking and alcohol consumption following pancreatitis.
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Stuart CEA, Singh RG, Alarcon Ramos GC, Priya S, Ko J, DeSouza SV, Cho J, and Petrov MS
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- Adult, Aged, Cross-Sectional Studies, Female, Humans, Male, Middle Aged, Risk Factors, Alcohol Drinking adverse effects, Pancreas pathology, Pancreatitis pathology, Tobacco Smoking adverse effects
- Abstract
Background: Tobacco smoking and alcohol consumption are established risk factors for diseases of the pancreas. With the recent advances in imaging modalities (such as magnetic resonance (MR) imaging), opportunities have arisen to study pancreas size, in both health and disease. Studies investigating the relationship between tobacco smoking, alcohol consumption, and total pancreas volume (TPV) - a holistic measure of pancreatic exocrine reserve - are lacking. The aim of the present study was to investigate the associations between MR-derived TPV and tobacco smoking/alcohol consumption., Methods: This cross-sectional study recruited individuals with a history of pancreatitis and healthy controls. A validated questionnaire was used to ascertain current and lifetime tobacco smoking and alcohol consumption. TPV was quantified using MR images by two independent raters. Generalized additive models and linear regression analyses were conducted and adjusted for demographic, metabolic, and pancreatitis-related factors., Results: A total of 107 individuals following pancreatitis and 38 healthy controls were included. There was no statistically significant difference in TPV between any of the tobacco smoking/alcohol consumption categories of individuals following pancreatitis and healthy controls, in both unadjusted and adjusted analyses. In individuals following pancreatitis, multivariate linear regression found no association between TPV and 7 smoking- and alcohol-related variables. Sensitivity analyses constrained to individuals who did not abstain from either smoking or drinking following their first attack of pancreatitis did not yield statistical significance with TPV. In post-hoc analysis, age was significantly inversely associated with TPV in the most adjusted model (p = 0.016)., Conclusions: This is the first study to investigate the association between tobacco smoking, alcohol consumption, and MR-derived TPV following pancreatitis. It appears that age, but not tobacco smoking or alcohol consumption, is associated with a significantly reduced TPV., (Copyright © 2019 IAP and EPC. Published by Elsevier B.V. All rights reserved.)
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- 2020
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33. Elevated Circulating Levels of Motilin are Associated with Diabetes in Individuals after Acute Pancreatitis.
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Gold-Smith FD, Singh RG, and Petrov MS
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- Adult, Cross-Sectional Studies, Female, Gastroparesis blood, Gastroparesis etiology, Humans, Male, Middle Aged, Blood Glucose metabolism, Diabetes Mellitus blood, Diabetes Mellitus etiology, Motilin blood, Pancreatitis blood, Pancreatitis complications
- Abstract
Aim: The study aimed to investigate the associations between glycaemic control after acute pancreatitis and gastrointestinal motility, using plasma motilin concentration and gastroparesis cardinal symptom index score as proxies., Methods: This cross-sectional study recruited a total of 93 individuals after acute pancreatitis. Gastroparesis cardinal index scores, demographic and anthropometric factors, as well as pancreatitis-related factors were analysed. Fasting venous blood was collected to measure motilin, glycated haemoglobin, and fasting blood glucose. Linear regression analyses were conducted to investigate the associations between glycaemic control and gastrointestinal motility in unadjusted and adjusted models., Results: Motilin was significantly higher in individuals with diabetes across all adjusted models, with the highest ß-coefficient (95% confidence interval) of 588.89 (138.50, 1039.28); P=0.010. Fasting blood glucose was significantly associated with motilin across all models, with the highest ß-coefficient (95% confidence interval) of 156.30 (55.49, 257.10); P=0.002. Glycated haemoglobin was significantly associated with motilin in one adjusted model with ß-coefficient (95% confidence interval) of 18.78 (1.53, 36.02); P=0.033. Gastroparesis cardinal symptom index was not significantly associated with any measure of glycaemic control., Conclusions: Diabetes in individuals after acute pancreatitis appears to be characterised by elevated plasma motilin but not gastroparesis cardinal symptom index. The role of motilin in this setting warrants further investigations., Competing Interests: No conflict of interest has been declared by the authors., (© Georg Thieme Verlag KG Stuttgart · New York.)
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- 2020
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34. Serum lipid profile as a biomarker of intra-pancreatic fat deposition: A nested cross-sectional study.
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Singh RG, Nguyen NN, Cervantes A, Cho J, and Petrov MS
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- Abdominal Fat diagnostic imaging, Abdominal Fat metabolism, Adult, Aged, Biomarkers blood, Case-Control Studies, Cholesterol blood, Cross-Sectional Studies, Female, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Pancreas diagnostic imaging, Pancreas metabolism, Pancreatitis diagnostic imaging, Pancreatitis physiopathology, Predictive Value of Tests, Prognosis, Abdominal Fat physiopathology, Adiposity, Pancreas physiopathology, Pancreatitis blood, Triglycerides blood
- Abstract
Background and Aims: The relationship between intra-pancreatic fat deposition (IPFD) and lipid profile has been investigated in individuals with obesity and/or type 2 diabetes, but not in healthy non-obese individuals and those after acute pancreatitis. The aim of the study was to investigate the association between serum lipid profile and IPFD in the latter individuals and to determine the effect of abdominal fat distribution and other covariates., Methods and Results: A total of 90 individuals with a history of acute pancreatitis as well as 23 healthy non-obese individuals participated in the study. Magnetic resonance imaging was used to quantify IPFD and visceral-to-subcutaneous fat volume ratio, followed by fasting state measurement of high-density lipoprotein cholesterol (HDL-C), low-density lipoprotein cholesterol (LDL-C), total cholesterol (TC), TC/HDL-C ratio, and triglycerides. In healthy non-obese individuals, IPFD was not significantly associated with any of the studied markers. In individuals after acute pancreatitis, IPFD was significantly associated with triglycerides in both unadjusted (β = 0.360; 95% CI, 0.090-0.629; p = 0.009) and adjusted models, with a β-coefficient of 0.280 [(95% CI, 0.016-0.545); p = 0.038] in the most adjusted model. Also, IPFD was significantly associated with TC/HDL-C ratio in both unadjusted (β = 0.336; 95% CI, 0.045-0.626; p = 0.024) and adjusted models, with a β-coefficient of 0.375 [(95% CI, 0.090-0.660); p = 0.010] in the most adjusted model. Multiple regression yielded triglycerides, but not TC/HDL-C ratio, as a significant marker of IPFD in individuals after acute pancreatitis., Conclusions: Serum lipid profile is not associated with IPFD in healthy non-obese. Triglycerides, but not other components of lipid profile, is a promising biomarker for IPFD in individuals following acute pancreatitis., (Copyright © 2019 The Italian Society of Diabetology, the Italian Society for the Study of Atherosclerosis, the Italian Society of Human Nutrition, and the Department of Clinical Medicine and Surgery, Federico II University. Published by Elsevier B.V. All rights reserved.)
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- 2019
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35. Circulating levels of lipocalin-2 are associated with fatty pancreas but not fatty liver.
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Singh RG, Nguyen NN, Cervantes A, Kim JU, Stuart CE, and Petrov MS
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- Adult, Aged, Chemokine CCL2 blood, Cross-Sectional Studies, Fatty Liver blood, Female, Humans, Interleukin-6 blood, Male, Middle Aged, Tumor Necrosis Factor-alpha blood, Lipocalin-2 blood, Pancreatic Diseases blood
- Abstract
Lipocalin-2 (LCN-2), a peptide with diverse expression pattern, has been identified as a biomarker of various diseases as well as a factor contributing to inflammatory responses associated with excess adiposity and ensuing metabolic disorders. Although the inter-relationship between LCN-2 and excess adiposity is increasingly recognized, little is known about the inter-relationship between LCN-2 and ectopic fat deposition. The present study aimed to investigate the associations between LCN-2 and fatty pancreas as well as fatty liver. In addition, the associations between LCN-2 and pro-inflammatory cytokines were studied. Magnetic resonance imaging was used to quantify intra-pancreatic fat deposition and visceral-to-subcutaneous fat volume ratio whereas magnetic resonance spectroscopy was used to quantify liver fat deposition. Fasting venous blood was analyzed for LCN-2, C-C motif chemokine ligand 2, interleukin-6, leptin, tumor necrosis factor-α, glycated hemoglobin, glucose, and insulin. Binary logistic regression and linear regression analyses were conducted. Three statistical models were built to adjust for demographics, comorbidities, levels of glycated hemoglobin, insulin resistance, and abdominal fat distribution. A total of 79 individuals were studied, of whom 20 had fatty pancreas, 14 had fatty liver, and 4 had both. Lipocalin-2 was significantly associated with fatty pancreas in all the adjusted models (p = 0.014 in the most adjusted model) but was not significantly associated with fatty liver in any of the studied models. Lipocalin-2 was significantly associated with interleukin-6 and tumor necrosis factor-α, in both the unadjusted and adjusted models. Leptin and C-C motif chemokine ligand 2 were not significantly associated with LCN-2 in any of the studied models. These findings suggest that LCN-2 is a potential biomarker of fatty pancreas, independent of abdominal fat distribution, insulin resistance, and other covariates. The role of LCN-2 in intra-pancreatic fat deposition and related low-grade inflammation warrants further investigations., (Copyright © 2019 Elsevier Inc. All rights reserved.)
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- 2019
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36. Associations between intra-pancreatic fat deposition and circulating levels of cytokines.
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Singh RG, Nguyen NN, Cervantes A, Alarcon Ramos GC, Cho J, and Petrov MS
- Subjects
- Adult, Aged, Female, Humans, Magnetic Resonance Imaging, Male, Middle Aged, Obesity blood, Pancreas diagnostic imaging, Pancreatitis blood, Reproducibility of Results, Adiposity, Cytokines blood, Pancreas metabolism
- Abstract
While a plethora of studies have been conducted to investigate the associations between pro-inflammatory cytokines and obesity, the inter-relationship between pro-inflammatory cytokines and intra-pancreatic fat deposition (IPFD) has been poorly investigated. In the present study, circulating levels of C-C motif chemokine ligand 2 (CCL2), interleukin-6 (IL-6), leptin, and tumor necrosis factor-alpha (TNFα) were measured in 90 individuals after acute pancreatitis (AP) as well as 21 healthy non-obese individuals. Magnetic resonance imaging was used to quantify IPFD and visceral-to-subcutaneous fat volume ratio by two independent raters. Linear regression analyses were performed to investigate the associations between IPFD and each cytokine, adjusting for demographic, metabolic, and pancreatitis-related factors, as well as abdominal fat distribution. In healthy non-obese individuals, IPFD was not significantly associated with any of the studied cytokines in both the unadjusted and adjusted models. In individuals after AP, IPFD was significantly associated with leptin in the models adjusted for age and sex (β = 0.063 [95% confidence interval: 0.007, 0.119], P = 0.026); age, sex, visceral-to-subcutaneous fat volume ratio, glycated hemoglobin, and pancreatitis-related factors (β = 0.056 [95% confidence interval: 0.000, 0.111], P = 0.049). Also, IPFD was significantly associated with TNFα in the unadjusted model (β = 0.102 [95% confidence interval: 0.002, 0.202], P = 0.045) and the model adjusted for age, sex, visceral-to-subcutaneous fat volume ratio, glycated hemoglobin, and pancreatitis-related factors (β = 0.128 [95% confidence interval: 0.034, 0.223], P = 0.008). The associations between IPFD and IL-6, CCL2 were not statistically significant, in both the unadjusted and adjusted models. These findings indicate that leptin and TNFα are associated with IPFD independent of abdominal fat distribution and other covariates in individuals after AP. The role of IPFD in low-grade inflammation warrants further investigations., (Copyright © 2019 Elsevier Ltd. All rights reserved.)
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- 2019
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37. Pancreas shrinkage following recurrent acute pancreatitis: an MRI study.
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DeSouza SV, Priya S, Cho J, Singh RG, and Petrov MS
- Subjects
- Acute Disease, Adult, Aged, Cross-Sectional Studies, Disease Progression, Female, Follow-Up Studies, Humans, Male, Middle Aged, Prospective Studies, ROC Curve, Recurrence, Magnetic Resonance Imaging methods, Pancreas pathology, Pancreatitis diagnosis
- Abstract
Objective: Transition from the first attack of acute pancreatitis (AP) to chronic pancreatitis (CP) via recurrent AP is common. Total pancreas volume (TPV) and pancreas diameters are often reduced in advanced CP but have never been studied after AP. The objective of this study was to investigate pancreas size after clinical resolution of AP and its association with the number of AP attacks., Methods: Individuals with a history of AP were grouped based on the number of attacks (1, 2, ≥ 3 attacks). Healthy individuals were also recruited. All participants underwent magnetic resonance imaging, from which TPV and pancreas diameters (across the head, body, and tail) were measured independently by two raters in a blinded fashion. Generalised additive models (including age, sex, body mass index, and glycated haemoglobin levels) were used., Results: A total of 123 participants were studied. Total pancreas volume and tail diameter were significantly reduced in both unadjusted (TPV (p = 0.036), tail diameter (p = 0.009)) and adjusted (TPV (p = 0.026), tail diameter (p = 0.034)) models in individuals with ≥ 3 attacks, but not with 1 or 2 attacks, compared with healthy individuals. Head and body diameters did not differ significantly., Conclusions: Reduced TPV and tail diameter characterise individuals after ≥ 3 attacks of AP and may represent one of the earliest irreversible morphological changes in individuals after AP. A high-risk population for transition to CP might include individuals with at least 3 attacks of AP whereas those with less than 3 attacks might be at a low risk., Key Points: • A significant reduction in total pancreas volume was demonstrated in individuals after 3 or more attacks of acute pancreatitis (without conventional signs of chronic pancreatitis). • Pancreas tail diameter, but not head or body diameter, was reduced in individuals after 3 or more attacks of acute pancreatitis (without conventional signs of chronic pancreatitis). • The above findings were independent of age, sex, body mass index, and glycated haemoglobin levels.
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- 2019
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38. Intrapancreatic fat deposition and visceral fat volume are associated with the presence of diabetes after acute pancreatitis.
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Singh RG, Cervantes A, Kim JU, Nguyen NN, DeSouza SV, Dokpuang D, Lu J, and Petrov MS
- Subjects
- C-Reactive Protein analysis, Cross-Sectional Studies, Female, Humans, Intra-Abdominal Fat diagnostic imaging, Intra-Abdominal Fat pathology, Male, Middle Aged, New Zealand, Diabetes Mellitus diagnosis, Diabetes Mellitus etiology, Diabetes Mellitus immunology, Pancreas diagnostic imaging, Pancreas metabolism, Pancreas pathology, Pancreatitis complications, Pancreatitis immunology
- Abstract
Ectopic fat and abdominal adiposity phenotypes have never been studied holistically in individuals after acute pancreatitis (AP). The aim of the study was to investigate phenotypical differences in ectopic fat and abdominal fat between individuals after AP (with and without diabetes) and to determine the role of pancreatitis-related factors. Eighty-four individuals were studied cross-sectionally after a median of 21.5 mo since last episode of AP and were categorized into "diabetes" and "no diabetes" groups. Twenty-eight healthy volunteers were also recruited. With the use of magnetic resonance imaging, intrapancreatic fat percentage, liver fat percentage, visceral fat volume (VFV), subcutaneous fat volume, and visceral-to-subcutaneous (V/S) fat volume ratio were quantified. Analysis of variance was used to investigate the differences in these phenotypes between the groups. All analyses were adjusted for age and sex. Linear regression analysis was used to investigate the association between pancreatitis-related factors and the studied phenotypes. Intrapancreatic fat percentage was significantly higher in the diabetes group (10.2 ± 1.2%) compared with the no diabetes (9.2 ± 1.7%) and healthy volunteers (7.9 ± 1.9%) groups ( P < 0.001). VFV was significantly higher in the diabetes (2,715.3 ±1,077.6 cm
3 ) compared with no diabetes (1,983.2 ± 1,092.4 cm3 ) and healthy volunteer (1,126.2 ± 740.4 cm3 ) groups ( P < 0.001). V/S fat volume ratio was significantly higher in the diabetes (0.97 ± 0.27) compared with no diabetes (0.68 ± 0.42) and healthy volunteer (0.52 ± 0.34) groups ( P = 0.001). Biliary AP was associated with significantly higher intrapancreatic fat percentage (β = 0.67; 95% CI, 0.01, 1.33; P = 0.047). C-reactive protein levels during hospitalization for AP were associated with significantly higher VFV (β = 3.32; 95% CI, 1.68, 4.96; P < 0.001). In conclusion, individuals with diabetes after AP have higher intrapancreatic fat percentage, VFV, and V/S fat volume ratio. Levels of C-reactive protein during AP are significantly associated with VFV, whereas biliary AP is significantly associated with intrapancreatic fat percentage. NEW & NOTEWORTHY Individuals with diabetes after acute pancreatitis have significantly higher intrapancreatic fat percentage and visceral fat volume compared with individuals without diabetes after acute pancreatitis and healthy controls. C-reactive protein levels during hospitalization for acute pancreatitis and biliary etiology of acute pancreatitis are associated with significantly larger visceral fat and pancreatic fat depots, respectively.- Published
- 2019
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39. Relationship of Anthropometric Indices to Abdominal Body Composition: A Multi-Ethnic New Zealand Magnetic Resonance Imaging Study.
- Author
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Cervantes A, Singh RG, Kim JU, DeSouza SV, and Petrov MS
- Abstract
Background: Conventional anthropometric indices (body mass index (BMI) and waist circumference (WC)) have limitations, in part, due to ethnic differences in fat distribution. Assessment of abdominal body composition using magnetic resonance imaging (MRI) is increasingly used to gain deeper insights into the pathophysiology of diabetes mellitus, cardiovascular diseases and metabolic syndrome, but the knowledge of abdominal volumes in indigenous populations is scarce. This study aimed to assess abdominal fat distribution and total abdominal volume using MRI in a multi-ethnic cohort that includes Maori (the indigenous people of New Zealand) and Pacific Islanders (PI)., Methods: MRI was used to quantify subcutaneous adipose tissue (SAT) volume, visceral adipose tissue (VAT) volume and total abdominal (TAb) volume by two independent raters in a blinded fashion. WC and BMI were also measured. Multinomial regression was used to compare the volumes between ethnic groups. Linear regression was used to investigate the ethnicity-specific associations between anthropometric indices and abdominal volumes. Three statistical models were built to adjust for age, sex, prediabetes/diabetes status and other covariates., Results: A total of 87 individuals (37 Caucasians, 24 Maori/PI and 26 others) were studied. Maori/PI had a significantly higher VAT volume compared with Caucasians across all statistical models, with the highest odds ratio of 2.1 (95% confidence interval: 1.1 - 4.2; P = 0.026). SAT and TAb volumes did not differ significantly between the groups. WC explained up to 72.9% of variance in VAT volume among Maori/PI and up to 50.7% among Caucasians. BMI explained up to 67.6% of variance in VAT volume among Maori/PI and up to 52.1% among Caucasians., Conclusions: Greater visceral fat deposition among Maori/PI might go some way towards explaining the increased rates of metabolic disorders observed in this ethnic group. Conventional anthropometric indices do not correspond to the same abdominal volumes across different ethnic groups., Competing Interests: None.
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- 2019
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40. Glucose Counter-regulation After Acute Pancreatitis.
- Author
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Bharmal SH, Pendharkar S, Singh RG, Cho J, and Petrov MS
- Subjects
- Acute Disease, Aged, Cross-Sectional Studies, Female, Glucagon blood, Humans, Hydrocortisone blood, Insulin blood, Interleukin-6 blood, Linear Models, Male, Middle Aged, Pancreatic Hormones blood, Pancreatitis diagnosis, Blood Glucose metabolism, Homeostasis, Hyperglycemia blood, Pancreatitis blood
- Abstract
Objectives: Persistent hyperglycemia is a common sequela of acute pancreatitis (AP). The role of counter-regulatory hormones in maintaining glucose homeostasis has been largely studied during the course of AP, but not after clinical resolution of the disease. The objectives of this study were to investigate the associations between circulating levels of glucagon, cortisol, and human growth hormone and glucose homeostasis after AP as well as their associations with a comprehensive panel of pancreatic hormones, gut peptides, and proinflammatory cytokines., Methods: Participants with no history of pre-existing prediabetes or diabetes were categorized into hyperglycemia and normoglycemia after AP groups. Binary logistic regression and linear regression analyses were conducted., Results: Eighty-three individuals were included, of whom 19 had hyperglycemia. Glucagon, cortisol, and human growth hormone did not differ significantly between the groups. Glucagon explained up to 86% of the variance in glucagon-like peptide 1, whereas cortisol explained up to 89% of the variance in interleukin 6 in hyperglycemia after AP., Conclusions: Counter-regulatory hormones do not appear to play a direct role in the mechanisms underlying hyperglycemia after AP. However, significant associations between glucagon and glucagon-like peptide 1, as well as between cortisol and interleukin 6, suggest that that these hormones may be involved indirectly in the pathophysiology of hyperglycemia after AP.
- Published
- 2019
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41. Associations between gastrointestinal humoral factors and pancreatic proteolytic enzymes in alcohol-related versus non-alcohol-related pancreatitis.
- Author
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Bharmal SH, Pendharkar SA, Singh RG, and Petrov MS
- Subjects
- Adult, Aged, Case-Control Studies, Cross-Sectional Studies, Female, Humans, Male, Middle Aged, Pancreas drug effects, Pancreatitis chemically induced, Chymotrypsin blood, Ethanol adverse effects, Gastrointestinal Tract metabolism, Hormones blood, Pancreas metabolism, Pancreatitis blood, Trypsin blood
- Abstract
Background: Alcohol-related pancreatitis is common and the gastrointestinal tract plays an important role in the regulation of pancreatic exocrine function. While the relationship between pancreatic proteolytic enzymes and insulin (as well as other pancreatic hormones) has been investigated in detail, little is known about the relationship between pancreatic proteolytic enzymes and gastrointestinal humoral factors. The aim of this study was to study the associations between trypsin, chymotrypsin, and a panel of gastrointestinal humoral factors in patients after an episode of alcohol-related versus non-alcohol-related pancreatitis., Methods: Fasting venous blood samples were analyzed for trypsin, chymotrypsin, cholecystokinin, gastrin, ghrelin, gastrin-related peptide, neuropeptide Y, peptide YY, secretin, and vasoactive intestinal peptide. Linear regression analysis was used in three statistical models, adjusting for covariates (age, sex, ethnicity, smoking, exercise, body mass index, dysglycemia, recurrence of pancreatitis, duration of pancreatitis, and severity of pancreatitis)., Results: The study included 21 patients with alcohol-related pancreatitis and 72 with non-alcohol-related pancreatitis. Gastrin, cholecystokinin, and vasoactive intestinal peptide were significantly associated with chymotrypsin in all three statistical models and resulted in a 1.06, 1.98, and 2.74 times higher chymotrypsin level in alcohol-related pancreatitis, respectively. Ghrelin was significantly associated with trypsin in all three statistical models and resulted in a 2.64 times higher trypsin level in alcohol-related pancreatitis. Other associations did not demonstrate a consistent significant pattern., Conclusion: In alcohol-related pancreatitis, several gut-related peptides are significantly associated with pancreatic exocrine function. Further studies to investigate the effect of alcohol on the interaction between cholecystokinin (as well as gastrin, ghrelin, and vasoactive intestinal peptide) and pancreatic exocrine function are warranted., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2019
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42. Gut Hormone Responses to Mixed Meal Test in New-Onset Prediabetes/Diabetes After Acute Pancreatitis.
- Author
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Pendharkar SA, Singh RG, Cervantes A, DeSouza SV, Bharmal SH, and Petrov MS
- Subjects
- Adult, Aged, Blood Glucose, Diabetes Mellitus, Type 2 diagnostic imaging, Diabetes Mellitus, Type 2 etiology, Dipeptidyl Peptidase 4 blood, Female, Gastric Inhibitory Polypeptide blood, Glucagon blood, Glucagon-Like Peptide 1 blood, Humans, Insulin blood, Magnetic Resonance Imaging, Male, Meals, Middle Aged, Oxyntomodulin blood, Pancreatitis blood, Pancreatitis diagnostic imaging, Peptide YY blood, Prediabetic State diagnostic imaging, Prediabetic State etiology, Subcutaneous Fat diagnostic imaging, Diabetes Mellitus, Type 2 blood, Gastrointestinal Hormones blood, Pancreatitis complications, Postprandial Period physiology, Prediabetic State blood
- Abstract
The study was aimed to investigate gut hormone responses to mixed meal test in individuals with new-onset prediabetes or diabetes after acute pancreatitis (cases) compared with healthy controls, and the effect of body fat parameters. A total of 29 cases and 29 age- and sex-matched healthy controls were recruited. All participants were given standard mixed meal drink and blood samples were collected to measure dipeptidyl peptidase IV, gastric inhibitory peptide, glucagon like peptide-1, insulin, oxyntomodulin, and peptide YY. Body fat parameters were measured using magnetic resonance imaging. Repeated measures and linear regression analyses were conducted in unadjusted and adjusted models. Gastric inhibitory peptide levels were significantly higher whereas oxyntomodulin levels were significantly lower in cases compared with controls in both the unadjusted (p<0.001 and p<0.001, respectively) and adjusted (p<0.001 and p<0.001, respectively) models. In cases, liver fat % contributed up to 13.4% (vs. 2.9% in controls) to variance in circulating levels of gastric inhibitory peptide whereas body mass index - up to 20.8% (vs. 9.9% in controls) in circulating levels of oxyntomodulin. New-onset prediabetes/diabetes after acute pancreatitis is characterised by increased levels of gastric inhibitory peptide and decreased levels of oxyntomodulin. Further, liver fat % and body mass index appear to be the body fat parameters that contribute most significantly to gastric inhibitory peptide and oxyntomodulin levels, respectively., Competing Interests: The authors declare that they have no conflict of interest., (© Georg Thieme Verlag KG Stuttgart · New York.)
- Published
- 2019
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43. Comprehensive analysis of body composition and insulin traits associated with intra-pancreatic fat deposition in healthy individuals and people with new-onset prediabetes/diabetes after acute pancreatitis.
- Author
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Singh RG, Nguyen NN, DeSouza SV, Pendharkar SA, and Petrov MS
- Subjects
- Acute Disease, Adiposity physiology, Adult, Age of Onset, Cross-Sectional Studies, Diabetes Complications metabolism, Diabetes Complications pathology, Diabetes Mellitus epidemiology, Diabetes Mellitus pathology, Female, Healthy Volunteers, Humans, Intra-Abdominal Fat pathology, Longitudinal Studies, Magnetic Resonance Imaging, Male, Pancreas diagnostic imaging, Pancreas pathology, Pancreatitis diagnosis, Pancreatitis epidemiology, Pancreatitis pathology, Prediabetic State complications, Prediabetic State epidemiology, Prediabetic State pathology, Body Composition physiology, Diabetes Mellitus metabolism, Insulin Resistance, Lipid Metabolism physiology, Pancreas metabolism, Pancreatitis metabolism, Prediabetic State metabolism
- Abstract
Current knowledge of biomarkers of intra-pancreatic fat deposition (IFD) is limited. We aimed to analyse comprehensively body composition and insulin traits as biomarkers of IFD in healthy normoglycaemic individuals as well as in individuals with new-onset prediabetes or diabetes after acute pancreatitis (NODAP). A total of 29 healthy individuals and 34 individuals with NODAP took part in this cross-sectional study. The studied biomarkers belonged to the following domains: body composition (anthropometric and MRI-derived variables); indices of insulin secretion; indices of insulin sensitivity; incretins and related peptides; and pancreatitis-related factors. All MRI-derived variables (including IFD) were measured using ImageJ software. Univariate and step-wise regression analyses were conducted to determine variables that best explained variance in IFD. Visceral fat volume and oxyntomodulin were the best biomarkers of IFD in normoglycaemic healthy individuals, contributing to 64% variance. The Raynaud index was the best biomarker of IFD in individuals with NODAP, contributing to 20% variance. Longitudinal studies are warranted to investigate the cause and effect relationship between oxyntomodulin and IFD in healthy individuals, as well as insulin sensitivity and IFD in individuals with NODAP., (© 2018 John Wiley & Sons Ltd.)
- Published
- 2019
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44. Pro-inflammatory cytokine-induced lipolysis after an episode of acute pancreatitis.
- Author
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Pendharkar SA, Singh RG, and Petrov MS
- Subjects
- Acute Disease, Adult, Aged, Biomarkers blood, Cohort Studies, Cross-Sectional Studies, Diabetes Mellitus, Type 2 epidemiology, Diabetes Mellitus, Type 2 immunology, Diabetes Mellitus, Type 2 metabolism, Female, Hospitals, Municipal, Humans, Male, Middle Aged, New Zealand epidemiology, Pancreatitis blood, Pancreatitis immunology, Pancreatitis physiopathology, Recurrence, Risk Factors, Severity of Illness Index, Diabetes Mellitus, Type 2 etiology, Glycerol blood, Interleukin-6 blood, Lipolysis, Pancreatitis metabolism, Tumor Necrosis Factor-alpha blood, Up-Regulation
- Abstract
Context: Pro-inflammatory cytokine-stimulated lipolysis is one of the mechanisms underlying the pathogenesis of type 2 diabetes. However, whether it plays a role in the pathogenesis of post-pancreatitis diabetes mellitus (PPDM) remains unknown., Objective: To investigate the associations between markers of lipid metabolism and pro-inflammatory cytokines in individuals after acute pancreatitis (AP) in general, and in individuals with abnormal glucose metabolism (AGM) following AP in particular., Methods: Fasting blood samples were collected to measure markers of lipid metabolism (apolipoprotein-B, cholesterol, free fatty acids (FFA), glycerol, high and low-density lipoproteins, triglycerides) and cytokines (interleukin (IL)-6, monocyte chemoattractant protein (MCP)-1, and tumour necrosis factor (TNF) α). Linear regression analysis was conducted. Four statistical models were used to adjust for patient- and pancreatitis-related characteristics., Results: A total of 83 patients were recruited. IL-6 was significantly associated with glycerol in all models (p < .05), with glycerol levels increasing by 106% in individuals with AGM after AP (p <.05) compared to a 30.3% increase in individuals with normal glucose metabolism (NGM) (p >.05). TNFα was significantly associated with FFA (p = .015) in individuals with AGM after AP in the most adjusted model, with FFA levels increasing by 314% in these individuals compared to a 162% decrease in individuals with NGM after AP (p >.05)., Conclusions: Lipolysis appears to be an important pathogenetic mechanism in glucose derangements after diseases of the exocrine pancreas. IL-6 and TNFα are the driving forces behind lipolysis in individuals with AGM after AP. Modulation of lipolysis may be a promising therapeutic modality.
- Published
- 2018
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45. A discourse analysis of the macro-structure, metadiscoursal and microdiscoursal features in the abstracts of research articles across multiple science disciplines.
- Author
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Ngai SBC, Singh RG, and Koon AC
- Abstract
The abstract of a scientific research article convinces readers that the article deserves to be read. Abstracts can also determine the success of publications and grant applications. In recent years, there has been a trend of cross-disciplinary collaborations in the science community. Scientists have been increasingly expected to engage not only experts of their own disciplines, but also other disciplines with the scope of interest extending to non-experts, such as policy-makers and the general public. Thus, the macro-structure, metadiscoursal and microdiscoursal features exhibited in scientific article abstracts merit attention. In our study, we examined 500 abstracts of scientific research articles published in 50 high-impact journals across five science disciplines (Earth, Formal, Life, Physical and Social Sciences), and performed quantitative analysis of the move structure as well as use of boosters and linguistic features. We found significant interdisciplinary variations in the move structure, boosters and linguistic features employed by these science disciplines. We confirmed that each science discipline possesses a distinct set of macro-structural, metadiscoursal and formalization features, which contribute to its own unique discipline-specific convention. Understanding and observing the disciplinary rhetorical choices and communication conventions will allow scientists to align the abstracts of their studies with the expectations of the targeted audience., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2018
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- View/download PDF
46. Abdominal obesity and insulin resistance after an episode of acute pancreatitis.
- Author
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Singh RG, Pendharkar SA, Cervantes A, Cho J, Miranda-Soberanis V, and Petrov MS
- Subjects
- Acute Disease, Adult, Aged, Body Mass Index, Cross-Sectional Studies, Drug Combinations, Female, Humans, Intra-Abdominal Fat metabolism, Male, Middle Aged, Pancreatitis metabolism, ROC Curve, Regression Analysis, Waist Circumference, Glycerol blood, Insulin blood, Insulin Resistance, Obesity, Abdominal etiology, Pancreatitis complications
- Abstract
Background: Emerging evidence indicates that individuals after an episode of acute pancreatitis (AP) are at an increased risk of developing metabolic derangements. While the link between general obesity and insulin resistance (IR) is well established, only a few studies have investigated the association between abdominal obesity and IR. The aim of this study was to investigate the associations between abdominal obesity and several indices of IR in individuals after an episode of AP., Methods: Patients were eligible for this cross-sectional study if they were previously admitted with a primary diagnosis of AP based on the recent international guidelines. Fasting venous bloods were collected to measure glucose, insulin, free fatty acids, glycerol, adiponectin (AD), omentin (OM), and vaspin (VAS). The IR indices - HOMA-IR, Adipo-IR, insulin*glycerol (IG) index, HOMA-AD, HOMA-OM, and HOMA-VAS were calculated. Modified Poisson regression was conducted, with statistical model adjusting for patient-, metabolic-, and pancreatitis-related risk factors. Areas under ROC curve were calculated and Bland-Altman plots were created., Results: Of the 92 individuals recruited, 41 had abdominal obesity. HOMA-IR, IG index, HOMA-OM, and HOMA-VAS were significantly associated with abdominal obesity, both in unadjusted and adjusted models. Area under ROC curves for HOMA-IR, IG index, HOMA-OM, and HOMA-VAS were 0.698, 0.695, 0.756, and 0.735, respectively. There was a good agreement between observed HOMA-IR values and values obtained from HOMA-OM (P = 0.733) and HOMA-VAS (P = 0.595)., Conclusion: Individuals with abdominal obesity after AP have a significantly higher IR, independent of diabetes and other covariates. Visceral adipose tissue specific adipokines, omentin and vaspin, hold promise for future clinical investigation of tissue-specific IR., (Copyright © 2018 Editrice Gastroenterologica Italiana S.r.l. Published by Elsevier Ltd. All rights reserved.)
- Published
- 2018
- Full Text
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47. Quantitative determination of pancreas size using anatomical landmarks and its clinical relevance: A systematic literature review.
- Author
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Desouza SV, Yoon HD, Singh RG, and Petrov MS
- Subjects
- Case-Control Studies, Diabetes Mellitus pathology, Humans, Organ Size, Pancreatic Neoplasms pathology, Pancreatitis pathology, Reference Values, Pancreas pathology
- Abstract
There have been many reports of altered pancreas size in diseases of the endocrine and exocrine pancreas, but few attempts to quantify such changes. The aim of this study was to conduct a systematic literature review, documenting the methodology, and quantitative data in studies reporting on pancreas size. Three electronic databases (Embase, Scopus, and MEDLINE) were searched by two reviewers independently. Studies of humans were included if they compared pancreas size (reported as pancreas diameters, areas, and/or lengths) between diseased populations and controls. A total of 28 studies with 3,810 individuals were included. Among these, 22 measured pancreas diameters, seven measured pancreas areas, and one measured pancreas lengths. The most common landmark for the head of the pancreas was the confluence of the superior mesenteric and splenic veins (three out of nine studies, 33.3%); for the body it was the superior mesenteric artery (seven out of nine, 77.8%); for the tail it was the internal border of the left kidney (two out of six, 33.3%). Pancreas diameters and areas tended to be smaller in diabetes mellitus, the extent of reduction being greater in individuals with type 1 than type 2 diabetes. Pancreas diameters tended to be greater in acute pancreatitis and pancreatic cancer but not in chronic pancreatitis. Pancreas diameters are a clinically relevant measure for diseases of the endocrine and exocrine pancreas. Consensus guidelines need to be developed to standardize their measurements. Clin. Anat. 31:913-926, 2018. © 2018 Wiley Periodicals, Inc., (© 2018 Wiley Periodicals, Inc.)
- Published
- 2018
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48. Profile of Gut Hormones, Pancreatic Hormones and Pro-inflammatory Cytokines in New Zealand Maori.
- Author
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Cervantes A, Singh RG, Pendharkar SA, Bharmal SH, and Petrov MS
- Abstract
Background: Maori, indigenous people of New Zealand, have at least two times higher prevalence of obesity and diabetes in comparison with the general population in the country. Gut and pancreatic hormone profile differences as well as pro-inflammatory milieu may contribute to this disparity. The aim was to investigate the differences in gut hormones, pancreatic hormones and pro-inflammatory cytokines between Maori and non-Maori individuals., Methods: This was a cross-sectional study. Fasting blood samples were collected to measure cholecystokinin, ghrelin, gastric inhibitory peptide, glicentin, glucagon-like peptide-1 and -2, oxyntomodulin, secretin, amylin, C-peptide, glucagon, insulin, pancreatic polypeptide, somatostatin, interleukin-6, monocyte chemoattractant protein-1 and tumour necrosis factor-α. Binary logistic regression analysis was conducted in one unadjusted and four adjusted statistical models adjusting for patient-, metabolic- and pancreatitis-related factors., Results: A total of 8 Maori and 85 non-Maori individuals were included. Circulating levels of ghrelin, pancreatic polypeptide and interleukin-6 levels were significantly higher in Maori (P = 0.005, P = 0.003 and P = 0.011, respectively) in both unadjusted and all the four adjusted analyses. Other signaling molecules did not show consistently significant associations with ethnicity., Conclusion: Profile of gut hormones, pancreatic hormones and pro-inflammatory cytokines appears to differ between Maori and non-Maori individuals, independent of obesity, diabetes and other covariates. This may go some way to explain the increased propensity to obesity and diabetes in the Maori population., Competing Interests: Aya Cervantes, Ruma G. Singh, Sayali A. Pendharkar, Sakina H. Bharmal and Maxim S. Petrov declare that they have no conflict of interest.
- Published
- 2018
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49. Pancreas volume in health and disease: a systematic review and meta-analysis.
- Author
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DeSouza SV, Singh RG, Yoon HD, Murphy R, Plank LD, and Petrov MS
- Subjects
- Diabetes Complications complications, Healthy Volunteers, Humans, Magnetic Resonance Imaging, Organ Size, Overweight complications, Pancreas diagnostic imaging, Pancreatic Diseases etiology, Pancreatic Diseases pathology, Reference Values, Tomography, X-Ray Computed, Pancreas anatomy & histology, Pancreas pathology, Pancreatic Diseases diagnostic imaging
- Abstract
Introduction: The pancreas plays a central role in metabolism and is involved in the pathogenesis of several diseases. Pancreas volume is a holistic quantitative measure of pancreas size but the clinical relevance of pancreas volumetry is poorly understood. Areas covered: The aim was to systematically review studies in adults that used computed tomography or magnetic resonance imaging to measure pancreas volume in health and disease, to determine normal pancreas volume range, and to quantify changes in pancreas volume that are associated with disease. Expert commentary: The normal pancreas volume range in adults is 71-83 cm
3 , with no statistically significant difference between men and women. Type 2 diabetes and type 1 diabetes are associated with a progressively reduced pancreas volume. Overweight and obesity are associated with a progressively increased pancreas volume. There is a paucity of studies on pancreas volume in the setting of diseases of the exocrine pancreas, which should become a research priority in the future.- Published
- 2018
- Full Text
- View/download PDF
50. Clinical profile of dengue fever and coinfection with chikungunya.
- Author
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Singh J, Dinkar A, Singh RG, Siddiqui MS, Sinha N, and Singh SK
- Abstract
Objective: Arthropod-borne viral diseases are a major burden on the health-care system worldwide. Only a few studies have reported on coinfection of dengue fever (DF) with the chikungunya virus in North India. We investigated the seroprevalence and significance of the clinicobiochemical profile of dengue and chikungunya coinfection. Besides this, the authors try to emphasize rationalize platelets transfusion., Material and Methods: The present study was conducted at the Heritage Institute of Medical Science, Varanasi, India, from July to December 2016. A total of 1800 suspected cases with acute viral febrile illness (age >18 years) were investigated to exclude other causes of acute febrile illnesses. Of these, 121 patients (6.72%) were diagnosed as seropositive for dengue and chikungunya mono or coinfection using IgM ELISA and were included in the study., Results: The male gender was predominant. The majority were in the 20-30-year age group with cases peaking in November. There were 102 (84.29%) cases of dengue, 6 (4.95%) cases of chikungunya, and 13 (10.74%) cases positive for coinfection. Fever was present in all cases. Headache followed by nausea/vomiting and generalized weakness were the most common symptoms in patients with DF while body aches and joint pain were most common in those with chikungunya fever. Deranged liver function and leukopenia were the most common complications in dengue., Conclusion: Joint-related symptoms (pain and restricted movements) were statistically significant in chikungunya monoinfection. Two patients with DF were died. There was no significant added severity of clinical features and blood investigations in patients with coinfection with dengue and chikungunya compared to those with monoinfections., Competing Interests: There is no conflict of interest.
- Published
- 2018
- Full Text
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