137 results on '"Qamar F"'
Search Results
2. Comparative Analysis of Commercially Available Typhoid Point-of-Care Tests: Results of a Prospective and Hybrid Retrospective Multicenter Diagnostic Accuracy Study in Kenya and Pakistan
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Sapkota, J, Hasan, R, Onsare, R, Arafah, S, Kariuki, S, Shakoor, S, Qamar, F, Mundalo, S, Njeru, F, Too, R, Ndegwa, E, Andrews, JR, and Dittrich, S
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Microbiology (medical) ,Point-of-Care Systems ,Humans ,Pakistan ,Prospective Studies ,Typhoid Fever ,Salmonella typhi ,Kenya ,Antibodies, Bacterial ,Sensitivity and Specificity - Abstract
Blood and bone marrow cultures are considered the gold standard for the diagnosis of typhoid, but these methods require infrastructure and skilled staff that are not always available in low- and middle-income countries where typhoid is endemic. The objective of the study is to evaluate the sensitivity and specificity of nine commercially available Salmonella Typhi rapid diagnostic tests (RDTs) using blood culture as a reference standard in a multicenter study. This was a prospective and retrospective multicenter diagnostic accuracy study conducted in two geographically distant areas where typhoid is endemic (Pakistan and Kenya; NCT04801602). Nine RDTs were evaluated, including the Widal test. Point estimates for sensitivity and specificity were calculated using the Wilson method. Latent class analyses were performed using R to address the imperfect gold standard. A total of 531 serum samples were evaluated (264 blood culture positive; 267 blood culture negative). The sensitivity of RDTs varied widely (range, 0 to 78.8%), with the best overall performance shown by Enterocheck WB (72.7% sensitivity, 86.5% specificity). In latent class modeling, CTK IgG was found to have the highest sensitivity (79.1%), while the highest overall accuracy was observed with Enterocheck (73.8% sensitivity, 94.5% specificity). All commercially available Salmonella Typhi RDTs evaluated in the study had sensitivity and specificity values that fell below the required levels to be recommended for an accurate diagnosis. There were minimal differences in RDT performances between regions of endemicity. These findings highlight the clear need for new and more-accurate Salmonella Typhi tests.
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- 2022
3. Azithromycin and cefixime combination versus azithromycin alone for the out-patient treatment of clinically suspected or confirmed uncomplicated typhoid fever in South Asia: a randomised controlled trial protocol [version 2; peer review: 2 approved]
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Giri, A., Karkey, A., Dongol, S., Arjyal, A., Maharjan, A., Veeraraghavan, B., Paudyal, B., Dolecek, C., Gajurel, D., Phuong, D.N.T., Thanh, D.P., Qamar, F., Kang, G., Hien, H.V., John, J., Lawson, K., Wolbers, M., Hossain, M.S., Sharifuzzaman, M., Luangasanatip, N., Maharjan, N., Olliaro, P., Rupali, P., Shakya, R., Shakoor, S., Rijal, S., Qureshi, S., Baker, S., Joshi, S., Ahmed, T., Darton, T., Bao, T.N., Lubell, Y., Kestelyn, E., Thwaites, G., Parry, C.M., and Basnyat, B.
- Abstract
Background: Typhoid and paratyphoid fever (enteric fever) is a common cause of non-specific febrile infection in adults and children presenting to health care facilities in low resource settings such as the South Asia. A 7-day course of a single oral antimicrobial such as ciprofloxacin, cefixime, or azithromycin is commonly used for its treatment. Increasing antimicrobial resistance threatens the effectiveness of these treatment choices. We hypothesize that combined treatment with azithromycin (active mainly intracellularly) and cefixime (active mainly extracellularly) will be a better option for the treatment of clinically suspected and culture-confirmed typhoid fever in South Asia.\ud \ud Methods: This is a phase IV, international multi-center, multi-country, comparative participant-and observer-blind, 1:1 randomised clinical trial. Patients with suspected uncomplicated typhoid fever will be randomized to one of the two interventions: Arm A: azithromycin 20mg/kg/day oral dose once daily (maximum 1gm/day) and cefixime 20mg/kg/day oral dose in two divided doses (maximum 400mg bd) for 7 days, Arm B: azithromycin 20mg/kg/day oral dose once daily (max 1gm/day) for 7 days AND cefixime-matched placebo for 7 days. We will recruit 1500 patients across sites in Bangladesh, India, Nepal, and Pakistan. We will assess whether treatment outcomes are better with the combination after one week of treatment and at one- and three-months follow-up.\ud \ud Discussion: Combined treatment may limit the emergence of resistance if one of the components is active against resistant sub-populations not covered by the other antimicrobial activity. If the combined treatment is better than the single antimicrobial treatment, this will be an important result for patients across South Asia and other typhoid endemic areas.\ud \ud Clinicaltrials.gov registration: NCT04349826 (16/04/2020)
- Published
- 2021
4. 100.3 Young Adults on Dialysis Undergoing PCI for Myocardial Infarction: Insights From Houston Methodist Young MI PCI Registry
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Hatab, T., Khan, S., Chaaya, R. G. Bou, Samimi, S., Qamar, F., Kharsa, C., Zaid, S., Aoun, J., Nasir, K., Goel, S.S., Shah, A.R., and Kleiman, N.S.
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- 2024
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5. 100.2 The Houston Methodist Young MI-PCI Registry: Preliminary Insights
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Chaaya, R.G. Bou, Khan, S.U., Hatab, T., Samimi, S., Qamar, F., Kharsa, C., Zaid, S., Aoun, J., Nasir, K., Goel, S.S., Shah, A.R., and Kleiman, N.S.
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- 2024
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6. A double-blind placebo-controlled trial of azithromycin to reduce mortality and improve growth in high-risk young children with non-bloody diarrhoea in low resource settings: the Antibiotics for Children with Diarrhoea (ABCD) trial protocol
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Alam, T, Ahmed, D, Ahmed, T, Chisti, MJ, Rahman, MW, Asthana, AK, Bansal, PK, Chouhan, A, Deb, S, Dhingra, P, Dhingra, U, Dutta, A, Jaiswal, VK, Kumar, J, Pandey, A, Sazawal, S, Sharma, AK, McGrath, C, Nyabinda, C, Okello, M, Pavlinac, PB, Singa, B, Walson, JL, Bar-Zeev, N, Dube, Q, Freyne, B, Ndamala, C, Ndeketa, L, Badji, H, Booth, JP, Coulibaly, F, Haidara, F, Kotloff, K, Malle, D, Mehta, A, Sow, S, Tapia, M, Tennant, S, Hotwani, A, Kabir, F, Qamar, F, Qureshi, S, Shakoor, S, Thobani, R, Yousufzai, MT, Bakari, M, Duggan, C, Kibwana, U, Kisenge, R, Manji, K, Somji, S, Sudfeld, C, Ashorn, P, Bahl, R, De Costa, A, Simon, J, and Team, ABCD Study
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Male ,Pediatrics ,Time Factors ,Antibiotics ,Placebo-controlled study ,Medicine (miscellaneous) ,Organism Hydration Status ,Growth ,030204 cardiovascular system & hematology ,Azithromycin ,Randomised ,Study Protocol ,0302 clinical medicine ,Child Development ,Risk Factors ,Infant Mortality ,Multicenter Studies as Topic ,Pharmacology (medical) ,030212 general & internal medicine ,Infant Nutritional Physiological Phenomena ,Randomized Controlled Trials as Topic ,2. Zero hunger ,lcsh:R5-920 ,Dehydration ,Age Factors ,Dysentery ,Water-Electrolyte Balance ,Cholera ,Paediatric diarrhoea ,Infant Nutrition Disorders ,3. Good health ,Anti-Bacterial Agents ,Treatment Outcome ,Female ,lcsh:Medicine (General) ,medicine.drug ,Diarrhea ,medicine.medical_specialty ,medicine.drug_class ,Nutritional Status ,Placebo ,Risk Assessment ,03 medical and health sciences ,Antibiotic resistance ,Double-Blind Method ,medicine ,Asia, Western ,Humans ,Mortality ,Developing Countries ,Africa South of the Sahara ,business.industry ,Malnutrition ,Infant ,medicine.disease ,business - Abstract
Background Acute diarrhoea is a common cause of illness and death among children in low- to middle-income settings. World Health Organization guidelines for the clinical management of acute watery diarrhoea in children focus on oral rehydration, supplemental zinc and feeding advice. Routine use of antibiotics is not recommended except when diarrhoea is bloody or cholera is suspected. Young children who are undernourished or have a dehydrating diarrhoea are more susceptible to death at 90 days after onset of diarrhoea. Given the mortality risk associated with diarrhoea in children with malnutrition or dehydrating diarrhoea, expanding the use of antibiotics for this subset of children could be an important intervention to reduce diarrhoea-associated mortality and morbidity. We designed the Antibiotics for Childhood Diarrhoea (ABCD) trial to test this intervention. Methods ABCD is a double-blind, randomised trial recruiting 11,500 children aged 2–23 months presenting with acute non-bloody diarrhoea who are dehydrated and/or undernourished (i.e. have a high risk for mortality). Enrolled children in Bangladesh, India, Kenya, Malawi, Mali, Pakistan and Tanzania are randomised (1:1) to oral azithromycin 10 mg/kg or placebo once daily for 3 days and followed-up for 180 days. Primary efficacy endpoints are all-cause mortality during the 180 days post-enrolment and change in linear growth 90 days post-enrolment. Discussion Expanding the treatment of acute watery diarrhoea in high-risk children to include an antibiotic may offer an opportunity to reduce deaths. These benefits may result from direct antimicrobial effects on pathogens or other incompletely understood mechanisms including improved nutrition, alterations in immune responsiveness or improved enteric function. The expansion of indications for antibiotic use raises concerns about the emergence of antimicrobial resistance both within treated children and the communities in which they live. ABCD will monitor antimicrobial resistance. The ABCD trial has important policy implications. If the trial shows significant benefits of azithromycin use, this may provide evidence to support reconsideration of antibiotic indications in the present World Health Organization diarrhoea management guidelines. Conversely, if there is no evidence of benefit, these results will support the current avoidance of antibiotics except in dysentery or cholera, thereby avoiding inappropriate use of antibiotics and reaffirming the current guidelines. Trial registration Clinicaltrials.gov, NCT03130114. Registered on April 26 2017.
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- 2020
7. Typhoid and Paratyphoid Cost of Illness in Pakistan: Patient and Health Facility Costs from the Surveillance for Enteric Fever in Asia Project II
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Mejia, N, Qamar, F, Yousafzai, MT, Raza, J, Garrett, DO, Date, K, Abimbola, T, Pallas, SW, Mejia, N, Qamar, F, Yousafzai, MT, Raza, J, Garrett, DO, Date, K, Abimbola, T, and Pallas, SW
- Abstract
Background: The objective of this study was to estimate the cost of illness from enteric fever (typhoid and paratyphoid) at selected sites in Pakistan. Methods: We implemented a cost-of-illness study in 4 hospitals as part of the Surveillance for Enteric Fever in Asia Project (SEAP) II in Pakistan. From the patient and caregiver perspective, we collected direct medical, nonmedical, and indirect costs per case of enteric fever incurred since illness onset by phone after enrollment and 6 weeks later. From the health care provider perspective, we collected data on quantities and prices of resources used at 3 of the hospitals, to estimate the direct medical economic costs to treat a case of enteric fever. We collected costs in Pakistani rupees and converted them into 2018 US dollars. We multiplied the unit cost per procedure by the frequency of procedures in the surveillance case cohort to calculate the average cost per case. Results: We collected patient and caregiver information for 1029 patients with blood culture-confirmed enteric fever or with a nontraumatic terminal ileal perforation, with a median cost of illness per case of US $196.37 (IQR, US $72.89-496.40). The median direct medical and nonmedical costs represented 8.2% of the annual labor income. From the health care provider perspective, the estimated average direct medical cost per case was US $50.88 at Hospital A, US $52.24 at Hospital B, and US $11.73 at Hospital C. Conclusions: Enteric fever can impose a considerable economic burden in Pakistan. These new estimates of the cost of illness of enteric fever can improve evaluation and modeling of the costs and benefits of enteric fever prevention and control measures, including typhoid conjugate vaccines.
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- 2020
8. A Cluster-based, Spatial-sampling Method for Assessing Household Healthcare Utilization Patterns in Resource-limited Settings
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Yu, AT, Shakya, R, Adhikari, B, Tamrakar, D, Vaidya, K, Maples, S, Date, K, Bogoch, II, Bern, C, Qamar, F, Yousafzai, MT, Garrett, DO, Longley, AT, Hemlock, C, Luby, S, Aiemjoy, K, Andrews, JR, Yu, AT, Shakya, R, Adhikari, B, Tamrakar, D, Vaidya, K, Maples, S, Date, K, Bogoch, II, Bern, C, Qamar, F, Yousafzai, MT, Garrett, DO, Longley, AT, Hemlock, C, Luby, S, Aiemjoy, K, and Andrews, JR
- Abstract
Background: Implementation of population-based surveys is resource intensive and logistically demanding, especially in areas with rapidly changing demographics and incomplete or no enumeration of the underlying population and their residences. To remove the need for pre-enumeration and to simplify field logistics for the population healthcare utilization survey used for the Surveillance for Enteric Fever in Asia Project in Nepal, we incorporated a geographic information system-based geosurvey and field mapping system into a single-stage cluster sampling approach. Methods: A survey was administered to ascertain healthcare-seeking behavior in individuals with recent suspected enteric fever. Catchment areas were based on residential addresses of enteric fever patients using study facilities; clusters were randomly selected from digitally created grids using available satellite images and all households within clusters were offered enrollment. A tablet-compatible geosurvey and mapping system that allowed for data-syncing and use in areas without cellular data was created using the ArcGIS suite of software. Results: Between January 2017 and November 2018, we surveyed 25 521 households in Nepal (16 769 in urban Kathmandu and 8752 in periurban Kavrepalanchok), representing 84 202 individuals. Overall, the survey participation rate was 90.9%, with geographic heterogeneity in participation rates within each catchment area. Areas with higher average household wealth had lower participation rates. Conclusion: A geographic information system-based geosurvey and field mapping system allowed creation of a virtual household map at the same time as survey administration, enabling a single-stage cluster sampling method to assess healthcare utilization in Nepal for the Surveillance for Enteric Fever in Asia Project. This system removed the need for pre-enumeration of households in sampling areas, simplified logistics and could be replicated in future community surveys.
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- 2020
9. Healthcare Utilization Patterns for Acute Febrile Illness in Bangladesh, Nepal, and Pakistan: Results from the Surveillance for Enteric Fever in Asia Project
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Andrews, JR, Vaidya, K, Saha, S, Yousafzai, MT, Hemlock, C, Longley, A, Aiemjoy, K, Yu, AT, Bogoch, II, Tamrakar, D, Date, K, Saha, SK, Garrett, DO, Luby, SP, Qamar, F, Andrews, JR, Vaidya, K, Saha, S, Yousafzai, MT, Hemlock, C, Longley, A, Aiemjoy, K, Yu, AT, Bogoch, II, Tamrakar, D, Date, K, Saha, SK, Garrett, DO, Luby, SP, and Qamar, F
- Abstract
Background: Characterizing healthcare-seeking patterns for acute febrile illness is critical for generating population-based enteric fever incidence estimates from facility-based surveillance data. Methods: We used a hybrid model in the Surveillance for Enteric Fever in Asia Project (SEAP) to assess incidence of enteric fever at 6 study hospitals in 3 countries. We recruited individuals presenting to the hospitals and obtained blood cultures to evaluate for enteric fever. For this analysis, we undertook cluster random household surveys in Dhaka, Bangladesh (2 sites); Karachi, Pakistan; Kathmandu, Nepal; and Kavrepalanchok, Nepal between January 2017 and February 2019, to ascertain care-seeking behavior for individuals with 1) fever for ≥3 consecutive days within the past 8 weeks; or 2) fever resulting in hospitalization within the past year. We also collected data about disease severity and household demographics and assets. We used mixed-effect multivariable logistic regression models to identify determinants of healthcare seeking at study hospitals and determinants of culture-confirmed enteric fever. Results: We enrolled 31 841 households (53926 children) in Bangladesh, 25510 households (84196 children and adults) in Nepal, and 21310 households (108031 children and adults) in Pakistan. Children <5 years were most likely to be taken to the study hospitals for febrile illness at all sites. Household wealth was positively correlated with healthcare seeking in 4 of 5 study sites, and at least one marker of disease severity was positively associated with healthcare seeking in 3 of 5 catchment areas. Wealth and disease severity were variably predictive of blood culture-confirmed enteric fever. Conclusions: Age, household wealth, and disease severity are important determinants of healthcare seeking for acute febrile illness and enteric fever risk in these communities, and should be incorporated into estimation models for enteric fever incidence.
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- 2020
10. Evaluación de las propiedades mecánicas de morteros fibrosos y bloques de suelo estabilizado y entrecruzado (ISSB) para viviendas de mampostería de bajo costo
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Qamar, F., Thomas, T., and Ali, M.
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Mortar ,Análisis de imágenes ,Ladrillo ,Propiedades mecánicas ,Fibre reinforcement ,Refuerzo de fibras ,Mechanical properties ,Brick ,Mortero ,Image analysis - Abstract
Walls of Interlocking Stabilised Soil Blocks (ISSBs) have been considered in low-cost houses around the world especially in developing countries. These were reported to be very weak in resisting the lateral load (e.g. wind or earthquake) without special considerations. In this paper, mechanical properties (compressive strength, elastic modulus, pre/post crack energy absorbed and toughness index) of ISSBs with three configurations and seven combinations of plain and fibrous mortar cubes are experimentally evaluated. Sisal fibre and rice straw (2% and 5%, by cement mass) were considered for fibrous mortar. Empirical equations were developed to predict elastic modulus. It was found that ISSBs had reasonable strength to be considered for masonry. The failure load and toughness index of 2% sisal fibre samples was improved by 10% and 16%, respectively, whereas 2.21 times enhancement was found in elastic modulus. Thus, 2% sisal fibre in plaster (i.e. reinforced coating) would likely improve the lateral resistance of interlocked masonry walling., Los muros de bloques de suelo estabilizados entrelazados (ISSB) se han utilizado en casas de bajo costo en todo el mundo, especialmente en países en desarrollo. Es conocido que estos muros presentaban debilidad frente a cargas laterales (por ejemplo, viento o terremoto) sin consideraciones especiales. En este trabajo se han evaluado las propiedades mecánicas (resistencia a compresión, módulo elástico, absorción de energía pre/post agrietamiento e índice de tenacidad) de ISSB con tres configuraciones y siete combinaciones de cubos de morteros liso y fibrosos. Para los morteros fibrosos se utilizó fibra de sisal y paja de arroz en proporciones del 2% y 5% con respecto a la masa de cemento. Se desarrollaron ecuaciones empíricas para predecir el módulo elástico. Los resultados mostraron que los ISSB poseen una fortaleza suficiente para poder ser utilizados en obras de albañilería. La carga de falla y el índice de tenacidad de las muestras de fibra de sisal al 2% se mejoraron en un 10% y un 16%, respectivamente, mientras que se encontró una mejora de 2.21 veces en el módulo de elasticidad. Por lo tanto, un 2% de fibra de sisal en yeso (es decir, revestimiento reforzado) probablemente mejoraría la resistencia lateral de las paredes.
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- 2019
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11. Adverse events following mass immunization with typhoid conjugate vaccine (Typbar TCV) at Hyderabad, Pakistan
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Karim, S., primary, Yousafzai, M.T., additional, Khaliq, A., additional, and Qamar, F., additional
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- 2020
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12. Understanding the Transboundary Karakoram-Pamir Landscape
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Ning, W., primary, Ismail, M., additional, Joshi, S., additional, Qamar, F. M., additional, Phuntsho, K., additional, Weikang, Y., additional, Khan, B., additional, Shaoliang, Y., additional, and Sharma, E., additional
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- 2014
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13. Assessment of mechanical properties of fibrous mortar and interlocking soil stabilised block (ISSB) for low-cost masonry housing
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Qamar, F., primary, Thomas, T., additional, and Ali, M., additional
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- 2019
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14. Impact of Climate Change on Vegetation Distribution and Net Primary Productivity of Forests of Himalayan River Basins: Brahmaputra, Koshi and Indus
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Chaitra, A., primary, Upgupta, S., additional, Bhatta, L. D., additional, Mathangi, J., additional, Anitha, D. S., additional, Sindhu, K., additional, Kumar, Vidya, additional, Agrawal, N. K., additional, Murthy, M. S. R., additional, Qamar, F., additional, Murthy, Indu K., additional, Sharma, J., additional, Chaturvedi, R. K., additional, Bala, G., additional, and Ravindranath, N. H., additional
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- 2018
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15. Multi-operational tuneable Q-switched mode-locking Er fibre laser
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Qamar, F Z, primary
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- 2017
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16. Awareness of Jaundice among Pharmacy Undergraduates at, Karachi, Pakistan
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Aisha Sana, Khalid R, Hmeed A, Fatima Qamar F, Azhar S, Amjad S, Owais Uea, Safila Naveed, Zamir M, Sufiyan S, and Hina Rehman
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Pediatrics ,medicine.medical_specialty ,business.industry ,medicine.medical_treatment ,Alternative medicine ,Pharmaceutical Science ,Exchange transfusion ,Pharmacy ,Disease ,Jaundice ,Diagnostic tools ,Omics ,medicine ,Etiology ,medicine.symptom ,business - Abstract
Jaundice is the most common condition that needs medical attention in newborns. About 80% of preterm and 50% of term infants develop jaundice in their early days of life. The purpose of this study is to check the awareness of this disease amongst the undergraduate students in our society. The main underlying reason for this study is to create awareness about the disease, its symptoms. Prior to fill these questinorrae the student got a brief lecture and understanding of the disease so they can link and understand the purpose well. A yellow coloration disease, jaundice is a medical condition due to hyperbilirubinaemia or increases the levels of bilirubin in the body. Depending on the position of jaundice, i.e. pre-hepatic, hepatic or post-hepatic, cause may vary. Common symptoms are dark coloured urine or pale coloured stool. Jaundice is caused due to abnormal destruction of red blood cells because bilirubin is made as a by-product in this process. CBC, LFT and different imaging techniques are used for the diagnosis of jaundice. Exchange transfusion, phototherapy, surgery and medications are usually considered as the treatment strategies. Our survey aimed to find out its awareness among the pharmacy undergraduates at Jinnah University for Women, Karachi, Pakistan. A random and cross-sectional method was to collect the data in the month of November- December, 2014. After our survey on awareness about jaundice at JUW, we find that 98.7% pharmacy undergraduates have awareness about the term jaundice, 70% pharmacy undergraduates have awareness about the Etiology of jaundice, 88.7% pharmacy undergraduates have knowledge about the symptoms of jaundice, 47.3% pharmacy undergraduates have knowledge about the pathophysiology of jaundice, 77.3% pharmacy undergraduates have knowledge about the diagnostic tools and techniques of jaundice and 63.3% pharmacy undergraduates have knowledge about the treatment strategies of jaundice.
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- 2015
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17. Multidrug-resistant tuberculosis in children: Special considerations
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Qamar, F., primary
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- 2016
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18. Optimization of Gain Flattening Filter to Achieve Flat Gain of EDFA for DWDM Chaotic Communication.
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Maqsood, S., Qamar, F., Khawar, M., Zafrullah, M., and Shahzad, A.
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CHAOTIC communication ,WAVELENGTH division multiplexing ,SEMICONDUCTOR lasers ,RATE equation model ,CHAOS synchronization - Abstract
In this paper the design of 8-channel Dense wavelength division multiplexing (DWDM) chaotic system is presented at frequencies ranging from 193.0 TIIz to 193.7 Thz. The chaotic signals are generated by. using semiconductor laser and mathematically modeled by laser rate equation. The Gain flattening! filter (OFF) is used with Erbium doped fiber amplifier (EDFA) in DWDM communication model for long distance transmission. The optimization of Gain| flattening filter is done in chaotic environment to achieve the flattened gain profile of EDFA. The synchronization of chaos at transmitter and receiver is| achieved to recover the received signal. Thus, our scheme combines two advantages i.e. efficient bandwidth utilization and security at the same time inj DWDM communication model. [ABSTRACT FROM AUTHOR]
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- 2018
19. Performance Analysis of Modulation Formats for Next Generation Passive Optical Networks.
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Qamar, F., Maqsood, S., Khawar, M., Zafrullah, M., and Shahzad, A.
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PASSIVE optical networks ,OPTICAL communications ,OPTICAL fiber communication ,OPTICAL fibers ,BIT rate - Abstract
In this research paper comparison of efficient binary modulation formats like Chirped-NRZ, Chirped-RZ, RZ-50%, Duobinary and AMI is carried out for GPON networks. Their performance is evaluated in terms of bit rates versus fiber link length. Chirped-NRZ comes out to be optimal modulation format for high speed and long reach optical communication. Quality of the received signal is analyzed by considering parameters like Q-factor and BER. Three different data rates i.e. 10 Gbps, 40 Gbps and 100 Gbps are selected to evaluate the performance of optical communication system whereas optical fiber length is varied from 40 km to 140 km. Simulations are performed on licensed version of Optisystem v.14. [ABSTRACT FROM AUTHOR]
- Published
- 2018
20. Pharmacy: A Dignified Profession but yet Deserted; A Dilemma for Pharmacy Profession and Future Pharmacist
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Qamar F, Abbas SS, primary
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- 2015
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21. Prevalence and Consequences of Misuse of Antibiotics, Survey Based Study in Karachi
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Qamar F, Naveed S, primary and Ayub A, Maqsood A, additional
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- 2015
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22. RISK DETERMINANTS THAT ESCALATE CARDIO VASCULAR DISORDERS.
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Sajed, A. N., Qamar, F., and Ahmad, N.
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TOBACCO smoke pollution , *VASCULAR diseases , *RISK perception , *CARDIOVASCULAR diseases , *BLOOD sugar - Abstract
Notwithstanding credible advances in cardiovascular health progress contributed by scientific studies during the preceding few decades, cardiovascular disease (CVD) relics a large number of deaths in developing as well as developed countries. Out of total of 161 articles screened. 87 articles were excluded based on the preliminary scrutiny of abstract and titles and the study was restricted to remaining 74 articles to capture the most relevant literature. The risk factors of cardio vascular diseases have been recognized as modifiable and non-modifiable risk factors. Modifiable cardio-vascular risk factors involve tobacco usage, hypertension, elevated blood glucose, dyslipidemia, overweight, environmental tobacco smoke (ETS), unhealthy diet, alcohol intake, lack of physical activity. The non modifiable cardio vascular risks are age, sex, family history and racial locale. A public awareness of risk factors contributing cardio vascular disorders is imperative for health of individuals and suggested to investigate time and again during life. Risk factors identified in this research are sufficient markers of changes in heart health during aging process. In future, risk factors of cardio vascular diseases should be included in secondary classes' syllabi for the early awareness and prevention of cardiovascular diseases in new generation. Public awareness should be enhanced through print and electronic media. Annual, work place surveys are required to be conducted for early identification of cardio vascular disorders in workers of government and private institutions/sectors, an effort that should be done on the part of employers to retain healthy and high quality employees. [ABSTRACT FROM AUTHOR]
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- 2022
23. ANIMAL BLOOD UTILIZATION FOR BIOMETHANE PRODUCTION THROUGH PRETREATMENTS AT LAB SCALE.
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Iqbal, T., Khan, H., and Qamar, F.
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RENEWABLE energy sources ,INDUSTRIAL productivity ,SONICATION ,ENERGY consumption ,FOSSIL fuels ,BIOELECTROCHEMISTRY - Abstract
High levels of waste produced by slaughterhouses are harmful to the environment and are a possible source of numerous pathogens dissemination. There is no effective system so far to control the effluent discharge from the slaughtering processing. Daily energy demands rise, but energy sources, particularly fossil fuels, are becoming more and more depleted. Offering alternative energy sources like biogas is one way to solve these issues. The productivity of the industrial sector can be boosted through effective management, which also minimizes environmental issues. The purpose of this study is to generate biomethane using animal blood as a substrate exposed to different pretreatments (NaOH/Sonication, NaOH/Heat, Only Sonication, H2O2/ Sonication and blank substrate). Biomethane production was carried out by Anaerobic Digestion in a lab scale digester. Anaerobic digestion can convert organic materials of animal blood into biogas. Results elucidated that NaOH/Sonication pretreatment was the most efficient and showed the highest percentage of methane production (86%) followed by other pretreatments i.e., NaOH/Heat (85%), Only Sonication (83%), H2O2/ Sonication (82%) and blank substrate (76%). Chen and Hashimoto model of kinetics was found to be the most feasible model of kinetics for the current study. [ABSTRACT FROM AUTHOR]
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- 2022
24. Frequency, Etiology and Leading Causes of Pre-Senile Cataract: A Descriptive Study
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Uzma Ali Kant, Maria Zubair, Fuad A K Niazi, Qamar Farooq, Sumra Munir, and Seher Umer
- Subjects
Cataract, Pre-senile cataract, diabetes mellitus, corticosteroids. ,Medicine - Abstract
Background: Cataract is generally caused due to physical aging, but in some cases, there are chances that it may develop in early ages (Pre-senile cataract). Pre-senile cataract is believed not to be primary in nature and some underlying ocular/systemic/environmental factor is causing the lens opacification at an early age. This study aim was to determine frequency and risk factors of pre-senile cataract in our population Methods: this observational study at Outdoor Patient - Eye in Benazir Bhutto Hospital, Rawalpindi (BBH), for the period from December 2017 to June 2018. Cataract was diagnosed on slit lamp examination. Detail history, Ocular and systemic examination was done for all pre-senile cataract cases. Laboratory/radiological investigations were performed when and where required. Using the Excel spreadsheet, Statistical analysis of descriptive data was carried out. Results: A total of 11448 patients were examined, whereby cataract was found in 849 (7.41%) patients. Out of these 849, 165 (19.43%) cases were pre-senile cataract. Pre-senile cataract was most seen in age group 30-49 86 (52.13%) and among women 93 (56.36%). The identified causes were idiopathic 55 (33.3%), diabetes 45(27.3%) and Steroids and other drugs related 33 (20.0%). posterior sub-capsular cataract is 60(36.36%) was most identified type in the study among pre-senile cataract.
- Published
- 2021
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25. Nematicidal natural products from the aerial parts ofLantana camaraLinn.
- Author
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Qamar, F., primary, Begum, S., additional, Raza, S. M., additional, Wahab, A., additional, and Siddiqui, B. S., additional
- Published
- 2005
- Full Text
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26. Self-induced pulsations, Q-switching and mode-locking in Tm–silica fibre lasers
- Author
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Qamar *, F. Z., primary and King, T. A., additional
- Published
- 2005
- Full Text
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27. Change of diffused and scattered light with surface roughness of p-type porous Silicon.
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Alfeel, F., Awad, F., Alghoraibi, I., and Qamar, F.
- Subjects
LIGHT scattering ,SURFACE roughness ,POROUS silicon ,SPECTROPHOTOMETRY ,LIGHT intensity ,COMPARATIVE studies - Abstract
Porous silicon samples were prepared by electrochemical etching method for different etching times. The structural properties of porous silicon (PS) samples were determined from the Atomic Force Microscopy (AFM) measurements. The surface mean root square roughness (σ rms) changes as function of porosity were studied, and the influence of etching time on porosity and roughness was studied too. UV-Vis-NIR Spectrophotometer with integrating sphere accessory used to measure the specular reflectance (R
spec ) and scattered light (Dsca ) for all samples. Changes of scattered light intensity with σ rms were studied. Theoretical and measured values were compared and they were almost the same. [ABSTRACT FROM AUTHOR]- Published
- 2014
28. Determination of porous Silicon thermal conductivity using the "Mirage effect" method.
- Author
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Alfeel, F., Awad, F., and Qamar, F.
- Subjects
POROUS silicon ,THERMAL conductivity ,MIRAGES ,ELECTROCHEMISTRY ,PHOTOTHERMAL effect ,CHEMICAL sample preparation - Abstract
Mirage effect is contactless and non destructive method which has been used a lot to determine thermal properties of different kind of samples, transverse photothermal deflection PTD in skimming configuration with ccd camera and special programs is used to determine thermal conductivity of porous silicon ps film. Ps samples were prepared by electrochemical etching. Thermal conductivity with porosity changing was measured and the experiments result compared with theoretical results, and they were almost the same. [ABSTRACT FROM AUTHOR]
- Published
- 2014
29. Literature review of bridge structure's optimization and it's development over time
- Author
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Zaheer Qasim, Yonggang Tan, and Qamar Furqan
- Subjects
metaheuristic algorithm ,bridge structure ,bridge optimization ,critical review of bridge optimization ,Industrial engineering. Management engineering ,T55.4-60.8 ,Industrial directories ,T11.95-12.5 - Abstract
The structural development in bridge engineering along with efficiency have got much attention in few decades. Leading to the development, Optimization of structure established on mathematical analysis emerged mostly employed strategies for productive and sustainable design in the bridge engineering. Despite the widespread knowledge, there has yet to be a rigorous examination of recent structural optimization exploration development. Thus, the primary objectives of this paper are to critically review previous structural optimization research, provide a detailed examination of optimization goals and outline recent research field limitations and provide guidelines for future research proposal in the field of bridge engineering structural optimization. This article begins by outlining the relevance of efficiency and sustainability in the bridge construction, as well as the work done required for this review. Suitable papers are gathered and followed by a statistical analysis of the selected publications. Following that, the selected papers are evaluated in terms of the optimization targets as well as their spatial patterns. Structure's optimization four key steps, including modeling, optimization techniques, formulation of optimization concerns and computational tools, are also researched and examined in depth. Finally, research gaps in contemporary works are identified, as well as suggested guidance for future works.
- Published
- 2022
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30. Self pulsations and self Q-switching in Ho3+, Pr3+:ZBLAN fibre lasers at 2.87 μm.
- Author
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Qamar, F. Z. and King, T. A.
- Subjects
- *
BRILLOUIN scattering , *ELECTROMAGNETIC wave scattering , *LIGHT scattering , *ABSORPTION , *PHYSICS - Abstract
The temporal characteristics of the output of a single-clad Ho3+, Pr3+-co-doped ZBLAN fibre laser pumped by a Nd:YAG laser at 1064 nm has been found to exhibit a range of cw, self pulsation and self Q-switching output dynamics, dependent on the excitation and fibre conditions. An interpretation is considered based on stimulated Brillouin scattering and the effect of the excited state absorption (ESA). For long fibre (∼13 m) and for uni-directional pumping, the output was a continuous wave (cw), but for bi-directional pumping, a significant decrease in the stability of the output is observed and the output displayed well developed self pulsations. A train of self Q-switched pulses with mean pulse duration of 767 ns, a peak pulse power of about 2.8 W and an average power of 183 mW and with more than 80% pulse-to-pulse stability has been observed when pumped with 4.4 W into each end of the fibre. Self pulsation phenomena are also observed in unidirectional pumping for shorter fibre lengths of ∼9.2 m at high pump power and for 1.5 m fibre length at all pumps power. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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31. Nematicidal natural products from the aerial parts of Lantana camara Linn.
- Author
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Qamar, F., Begum, S., Raza, S. M., Wahab, A., and Siddiqui, B. S.
- Subjects
LANTANA camara ,NEMATOCIDES ,METHANOL ,SOUTHERN root-knot nematode ,PESTICIDES ,NATURAL products - Abstract
Lantanilic acid, camaric acid and oleanolic acid possessing nematicidal activity were isolated from the methanolic extract of the aerial parts of Lantana camara Linn. through bio-assay guided fractionation. These compounds exhibited 98%, 95% and 70% mortality respectively against root-knot nematode Meloidogyne incognita at 0.5% concentration. Conventional nematicide furadan showed 100% mortality at this concentration. [ABSTRACT FROM AUTHOR]
- Published
- 2005
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32. Assessing Human Factor in the Adoption of Computer-Based Information Systems as the Internal Corporate Social Responsibility
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Qamar Farooq, Peihua Fu, Shahzad Ahmad, Yanni Zhang, and Yunhong Hao
- Subjects
History of scholarship and learning. The humanities ,AZ20-999 ,Social Sciences - Abstract
Computerization in management information systems has thickly segregated employment and unemployment which are being discussed due to technological implementation at operational and strategic levels. In this article, we have evaluated the criticism and internal corporate social responsibility (CSR) challenges caused due to the espousal of computer-based information systems (CBIS) by the companies. Based on existing measures, a comprehensive questionnaire was designed and distributed to 120 employees of the companies having the adoption plan of CBIS. The hypothesized model of CBIS implementation intention disclosure and human factor was tested with correlation and regression analysis of the data received from 108 employees (90% response rate). Results show a positive relationship between technological trends and motivation of computer literate employees. We have established our study in the context of human capital management which is a sociobehavioral notion for meeting the internal CSR. Theoretical implications of this study have been progressively discussed simultaneously with the limitations therein. Our research has practical implications for corporate managers, human resource managers, and management information systems managers in manufacturing industries.
- Published
- 2019
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33. A Review of Management and Importance of E-Commerce Implementation in Service Delivery of Private Express Enterprises of China
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Qamar Farooq, Peihua Fu, Yunhong Hao, Tchamy Jonathan, and Yanni Zhang
- Subjects
History of scholarship and learning. The humanities ,AZ20-999 ,Social Sciences - Abstract
Express delivery is the growing industry that provides the means to facilitate people across the world by shipping goods and documents from one place to another. The profitability of sole companies is based on price, quality, reliability, and services. However, the impact of corporate value capture strategies on the overall sustainability of the value creation process is rarely discussed in the existing literature. This review article is aimed to develop a model to relate the effectiveness and efficiency of managerial processes with the quality of service delivery, employment, and customer retention. Extensive literature review establishes that Advancement in E-commerce Infrastructure strengthens the relationship of good management and customer retention. The present article further explains the mediation of automation in supply chain management in our model. This article has a theoretical contribution to the extant literature on e-commerce and supply chain management along with practical implication for taking care of contemporary techniques to automate the processes for success in Private Express Enterprise business, particularly for the managers, responsible for corporate performance.
- Published
- 2019
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34. Visual Outcome of Intravitreal Bevacizumab in Treatment of Diabetic Retinopathy
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Kanwal Zareen Abbasi, Warda Ali, Qamar Farooq, Ali Raza, and Ana Rizvi
- Subjects
Visual Outcome ,Intravitreal ,Bevacizumab ,Diabetic Retinopathy ,Medicine - Abstract
Background :To evaluate the efficacy of monthly intravitreal bevacizumab injections (1.25 mg/.05 ml) in improving or stabilizing visual acuity measured by Snellen’s visual acuity charts for diabetic retinopathy. Methods: This was a prospective Quasi experimental study of 59 diabetic patients having diabetic retinopathy with indication of intravitreal anti VEGF,Bevacizumab. Patients diagnosed of having fresh vitreous haemorrhage and diabetic macular edema were included. Maximum three intravitreal bevacizumab injections were given, each with a dose of 1.25mg in 0.05ml(at 0month, 1 month, 2 months) with final follow up at the period of 3 months. The criteria for improvement was a gain of at least one line on Snellen’s visual acuity chart, compared to the baseline while stabilization was considered if the visual acuity was unchanged relative to the baseline. Results: A total of 59 patients, 25 (49.1%) males and 34 (50.84%) females , having age range 40-65 years,were given intravitreal injection. Twenty six eyes (44.06%) with diabetic macular edema showed improvement while visual acuity was stabilized in 4 eyes (6.7%). In patient with vitreous hemorrhage, 27 eyes (45.76%) showed improvement while stabilization of visual acuity was noted in 2 eyes (3.3%). No patient with worsening of visual acuity was noted. Conclusion: Intravitreal Bevacizumab is very effective in improving the visual outcome in diabetic patients having macular edema and vitreous hemorrhage
- Published
- 2018
35. PERFORMANCE ANALYSIS OF 128-QAM DUAL POLARIZATION SYSTEM FOR LONG HAUL OPTICAL COMMUNICATION.
- Author
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Sarwar, A. S., Qamar, F., and Ahmad, M. S.
- Subjects
- *
OPTICAL communications , *DIGITAL signal processing , *OPTICAL engineering , *IEEE 802.16 (Standard) , *CODE division multiple access - Abstract
Highlights from the article: QAM modulation provides a better transmission performance because QAM constellation points are considerably more scattered in comparison to PSK constellation points. After decision polarization, QAM modulation is applied on the signal which is fed back to the transmitter. QAM sequence generator feeds the input into the M-ary pulse generator, which transforms the QAM signal into pulses. Binary signals are first converted into M-ary signals along with quadrature modulation then they are added to achieve desired M-ary QAM signal.
- Published
- 2018
36. Nematicidal Constituents of the Aerial Parts of Lantana camara
- Author
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Begum, S., Wahab, A., Siddiqui, B. S., and Qamar, F.
- Abstract
Two new constituents, lantanoside (
1 ) and lantanone (2 ), and the known compounds linaroside (3 ) and camarinic acid (4 ) were isolated from the aerial parts of Lantana camara. Compounds1 ,3 , and4 were tested for nematicidal activity against root-knot nematode Meloidogyne incognita and showed 90, 85, and 100% mortality, respectively, at 1.0% concentration. The results were comparable to those obtained with the conventional nematicide furadan (100% mortality at 1.0% concentration). Structures of the new compounds were elucidated by spectroscopic and chemical techniques.- Published
- 2000
37. Distribution and habitat mapping of key fauna species in selected areas of Western Himalaya, Pakistan
- Author
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Qamar, F. M., Ali, H., Salman Ashraf, Daud, A., Gillani, H., Mirza, H., and Rehman, H. U.
38. Refractive Errors Causing Amblyopia in Children
- Author
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Qamar Farooq
- Subjects
Myopia ,Hypermetropia ,Amblyopia ,Anisometropia. ,Medicine - Abstract
Background: To categorize the refractive errors of of school children into Myopia, Hypermetropia, Astigmatism and Anisometropia and to determine the rate of Amblyopia in these refractive errors for a more generalized use. Methods: In this cross stectional study visual acuity of eyes of the school children was checked . Those having visual acuity (VA) less than 6/6 in any eye were refracted and the glasses tried. Children unable to read 6/9 or above on Snellens test chart , or having a difference of two or more lines between the two eyes in spite of using prescribed glasses were scheduled for detailed ophthalmic examination to look for the cause of poor vision. Results: A total of 74133 children aging 5-14 years including males and females in equal proportions and comparable ages from 1383 schools were screened by using Snellens chart. 2523 (3.4%) children were found to be subnormal in their vision and 2504(3.378% of total study population) out of them were declared having refractive errors after complete ocular examination.1850 (2.5%) were myopic, 654 (0.88%) hypermetropics and 140 (0.189%) were amblyopics. Of the 140 cases of amblyopia in our study, the cause was anisometropia in 85(60.7%) cases, ametropia in 29 (20.7%) and mixed astigmatism in 26(18/5%) cases.Of the 1850 myopic, 1345(72.7%) were
- Published
- 2014
39. The Houston Methodist Young MI-PCI Registry: Preliminary Insights.
- Author
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Bou Chaaya, R.G., Khan, S.U., Hatab, T., Samimi, S., Qamar, F., Kharsa, C., Zaid, S., Aoun, J., Nasir, K., Goel, S.S., Shah, A.R., and Kleiman, N.S.
- Subjects
- *
METHODISTS - Published
- 2024
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- View/download PDF
40. Young Adults on Dialysis Undergoing PCI for Myocardial Infarction: Insights From Houston Methodist Young MI PCI Registry.
- Author
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Hatab, T., Khan, S., Bou Chaaya, R.G., Samimi, S., Qamar, F., Kharsa, C., Zaid, S., Aoun, J., Nasir, K., Goel, S.S., Shah, A.R., and Kleiman, N.S.
- Subjects
- *
YOUNG adults , *MYOCARDIAL infarction , *METHODISTS , *DIALYSIS (Chemistry) - Published
- 2024
- Full Text
- View/download PDF
41. The molecular epidemiology of bloodstream infections caused by non-Salmonella Gram-negative bacteria in a tertiary hospital in Nepal with focus on neonatal sepsis and Enterobacter species
- Author
-
Manandhar, S, van Doorn, HR, Qamar, F, Karkey, A, Baker , S, and Dixit, SM
- Subjects
Clinical medicine - Abstract
Bloodstream infections (BSIs) are common cause of morbidity and mortality among patients of all age groups. Of particular concern is the increasing emergence and spread of antimicrobial resistance (AMR) in many Gram-negative bacteria (GNB) that cause BSIs. The aim of this thesis was to determine some of the epidemiological features of BSIs in a tertiary hospital in Nepal providing a specific focus on the molecular aspects of AMR, virulence, and variations in Enterobacter spp., a clinically important GNB associated with BSIs. To better understand BSIs-causing non-Salmonella GNB and their AMR determinants in this setting, I conducted a retrospective surveillance study, accessing data from 2012 to 2018. I identified a high prevalence of multi-drug resistance (MDR) and several key AMR genes associated with predominant GNB pathogens. The neonatal intensive care unit (NICU) and the emergency room (ER) were the most prevalent hospital departments for BSIs. To gain an insight into the epidemiology of hospital-acquired (HA) BSIs and identify potential preventive measures, I conducted a further prospective study in the NICU. An increased isolation of Enterobacter spp. in the NICU during the study period suggested an outbreak, prompting an outbreak investigation of Enterobacter spp. isolates using whole genome sequencing (WGS). Identification of ER to having the highest burden of BSIs due to Enterobacter spp. demanded for an epidemiological research to understand the genomic determinants of virulence, AMR, and variations of Enterobacter spp.. To address this, I performed a comprehensive WGS analysis of Enterobacter spp. isolated in the ER. The conclusion of my work is that BSIs due to antimicrobial resistant non-Salmonella GNB is an expanding problem in our hospital, highlighting the need for a continued AMR surveillance. I found that Enterobacter spp. was an emerging MDR pathogen causing BSIs in this hospital. The complex transmission dynamics of Enterobacter spp. observed in ER warranted for a more comprehensive genomic investigation complemented with demographic and clinical data of patients to better disaggregate the epidemiology of BSIs in ER.
- Published
- 2022
42. Young adults with acute coronary syndrome undergoing percutaneous coronary intervention: Insights from the Houston Methodist Young ACS-PCI Registry.
- Author
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Khan SU, Bou Chaaya RG, Hatab T, Samimi S, Qamar F, Kharsa C, Arshad HB, Zaid S, Aoun J, Patel KV, Nasir K, Al-Kindi S, Zoghbi W, Goel SS, Shah AR, and Kleiman NS
- Abstract
Background: Limited data exist on the risk profile and prognosis of young patients undergoing percutaneous coronary intervention (PCI) for acute coronary syndrome (ACS). This study sheds light on the burden of cardiovascular risk factors and outcomes in this population., Methods: The Houston Methodist Young ACS-PCI registry is a retrospective analysis of young adults (18 to 50 years) undergoing PCI for ACS between 2010 and 2022. Outcomes of interest were major adverse cardiovascular events (MACE: all-cause mortality, myocardial infarction (MI), ischemic stroke) at one year., Results: Among 629 patients (median age, 46 years, 23.5% women, and 65.3% White adults), 69.2% had Non-ST-Segment Elevation MI. A total of 22.7% had prior MI, 26.2% prior PCI, and 9.2% had prior coronary artery bypass graft surgery. The prevalence of active smoking, dyslipidemia, hypertension, and diabetes was 69.4%, 82.2%, 80.4%, and 39.6%, respectively. Age-adjusted diabetes rates increased over time, while dyslipidemia, hypertension, and obesity rates remained unchanged. The femoral artery was the most common arterial access (85.2%), 72.7% had one vessel disease, 44.3% had the left anterior descending artery as the culprit vessel, and 78.5% of patients received one stent. At a median of 3.8 years, all-cause mortality was 28 deaths per 1000 person-years. At one year, 11.4% experienced MACE; racial and ethnic minority (Black, Hispanic, and Others), dialysis, prior MI, and stent diameter were independent predictors of MACE., Conclusions: The study highlights a notable burden of cardiovascular risk factors and cardiovascular outcomes in young adults with ACS undergoing PCI, underscoring the need for strategies to enhance risk assessment and guide interventions among young adults., 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 article., (Copyright © 2024 Elsevier Inc. All rights reserved.)
- Published
- 2024
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43. Beyond Grit and Resilience: An AWS series on surgical culture change.
- Author
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Qamar F, Hernandez AE, Cannada LK, and McMullen C
- Published
- 2024
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44. Increased artemisinin production in Artemisia annua L. by co-overexpression of six key biosynthetic enzymes.
- Author
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Qamar F, Mishra A, Ashrafi K, Saifi M, Dash PK, Kumar S, and Abdin MZ
- Subjects
- Biosynthetic Pathways, Gene Expression Regulation, Plant, Plant Proteins genetics, Plant Proteins metabolism, Artemisinins metabolism, Artemisia annua genetics, Artemisia annua enzymology, Artemisia annua metabolism, Plants, Genetically Modified genetics
- Abstract
Malaria remains a global health issue, especially in resource-limited regions. Artemisinin, a key antimalarial compound from Artemisia annua, is crucial for treatment, but low natural yields hinder large-scale production. In this study, we employed advanced transgenic technology to co-overexpress six key biosynthetic enzymes-Isopentenyl Diphosphate Isomerase (IDI), Farnesyl Pyrophosphate Synthase (FPS), Amorpha 4,11-diene Synthase (ADS), cytochrome P450 monooxygenase (CYP71AV1), cytochrome P450 oxidoreductase (AACPR) and artemisinic aldehyde D11 reductase (DBR2)-in A. annua to significantly enhance artemisinin production. Our innovative approach utilized a co-expression strategy to optimize the artemisinin biosynthetic pathway, leading to a remarkable up to 200 % increase in artemisinin content in T1 transgenic plants compared to non-transgenic controls. The stability and efficacy of this transformation were confirmed in subsequent generations (T2), achieving a potential 232 % increase in artemisinin levels. Additionally, we optimized transgene expression to maintain plant growth and development, and performed untargeted metabolite analysis using GC-MS, which revealed significant changes in metabolite composition among T2 lines, indicating effective diversion of farnesyl diphosphate into the artemisinin pathway. This metabolic engineering breakthrough offers a promising and scalable solution for enhancing artemisinin production, representing a major advancement in the field of plant biotechnology and a potential strategy for more cost-effective malaria treatment., Competing Interests: Declaration of competing interest The authors have no relevant financial or non-financial interests to disclose., (Copyright © 2024 Elsevier B.V. All rights reserved.)
- Published
- 2024
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45. Impact of systolic dominant pulmonary venous flow morphology on outcomes after mitral transcatheter edge-to-edge repair.
- Author
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Samimi S, Hatab T, Bou Chaaya R, Kharsa C, Qamar F, Faza N, Little SH, Atkins MD, Reardon MJ, Kleiman NS, Nagueh SF, Zoghbi WA, Zaid S, and Goel SS
- Subjects
- Humans, Male, Female, Retrospective Studies, Aged, Treatment Outcome, Time Factors, Risk Factors, Aged, 80 and over, Echocardiography, Doppler, Pulsed, Pulmonary Circulation, Risk Assessment, Systole, Blood Flow Velocity, Mitral Valve physiopathology, Mitral Valve diagnostic imaging, Mitral Valve surgery, Mitral Valve Insufficiency physiopathology, Mitral Valve Insufficiency diagnostic imaging, Mitral Valve Insufficiency surgery, Pulmonary Veins physiopathology, Pulmonary Veins diagnostic imaging, Pulmonary Veins surgery, Cardiac Catheterization, Predictive Value of Tests
- Abstract
Background: The prognostic significance of intraprocedural pulsed-wave Doppler analysis of pulmonary venous flow (PVF) during mitral transcatheter edge-to-edge repair (TEER) remains understudied. We aimed to investigate the prognostic value of systolic dominant-PVF (SD-PVF) morphology post-TEER., Methods: In a retrospective analysis from December 2019 to December 2022, patients undergoing mitral TEER were categorized into SD-PVF and systolic blunting (SB)-PVF groups based on post-TEER morphology. The primary endpoint was a composite of all-cause mortality or heart failure hospitalization at 1 year. We investigated the association of PVF morphology post-TEER with the primary endpoint at 1 year using Cox regression and compared the prognostic accuracy of PVF variables through receiver operating characteristic (ROC) curve analysis., Results: Among 187 patients (mean age 76.4 ± 10.5 years, 51.3% primary etiology), residual mitral regurgitation (MR) ≤mild was observed in 147 (82.4%) patients and 105 (56.2%) had SD-PVF post-TEER. Patients with SD-PVF had a lower incidence of >2+ residual MR after clip deployment, at 30 days (2.1% vs. 13.1%; p = 0.005) and at 1 year (1.4% vs. 9%; p = 0.08). SD-PVF post-TEER was independently associated with the primary endpoint (HR = 0.59, 95% CI = 0.39-0.87; p = 0.009). ROC curve analysis of the prognostic accuracy of SD-PVF demonstrated an AUC of 0.64 (95% CI = 0.54-0.73), comparable to other quantitative measures of PVF., Conclusion: Assessing PVF morphology after clip deployment offers a simple prognostic tool for patients undergoing mitral TEER. Multicenter cohorts will be necessary to further investigate its prognostic value., (© 2024 Wiley Periodicals LLC.)
- Published
- 2024
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- View/download PDF
46. Outcomes of mitral transcatheter edge-to-edge repair in patients with mitral annular calcification: A meta-analysis.
- Author
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Samimi S, Hatab T, Kharsa C, Bou Chaaya RG, Qamar F, Khan SU, Aoun J, Zaid S, Faza N, Little SH, Atkins MD, Reardon MJ, Kleiman NS, Zoghbi WA, and Goel SS
- Abstract
Background: The impact of mitral annular calcification (MAC) on the clinical outcomes of patients undergoing mitral transcatheter edge-to-edge repair (MTEER) remains unclear. This meta-analysis aims to evaluate the clinical outcomes of MTEER among patients with moderate to severe MAC compared to those with mild or no MAC., Methods: We systematically searched PubMed, EMBASE, and Cochrane CENTRAL databases through March 31st, 2024, comparing clinical outcomes of MTEER among patients with moderate/severe (MAC+) versus no/mild MAC (MAC-). We assessed pooled estimates for procedural success, all-cause mortality, residual mitral regurgitation (MR) ≤ moderate, and New York Heart Association (NYHA) class III/IV status at one year., Results: Among five studies (2533 patients; mean age 76.4 ± 10.9 years, 39.8 % women), MAC+ patients were predominantly women (55.7 % vs 37.5 %, p < 0.001), older (87.9 ± 11.1 vs. 75.9 ± 9.1 years; mean difference (MD) = 3.99, p = 0.011) and had higher STS scores (7.7 ± 6.7 % vs. 4.9 ± 4.6 %; MD = 1.34, p < 0.001). MAC+ patients had comparable procedural success rates, residual MR < moderate, and NYHA III/IV at 1 year. However, all-cause mortality at 1 year was higher for MAC+ patients (Relative Risk = 1.56, 95 % CI = 1.06-2.29)., Conclusions: MTEER is a safe and feasible option for carefully selected patients with MAC and significant MR, offering durable MR reduction and functional status improvement. Significantly higher one-year mortality associated with MAC despite significant MR reduction suggests an increased risk unrelated to valvular dysfunction and highlights the need for further investigation into identifying patients who benefit the most from MTEER., Competing Interests: Declaration of competing interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Sachin S. Goel reports a relationship with Abbott that includes: speaking and lecture fees. Michael J. Reardon reports a relationship with Abbott that includes: consulting or advisory. Neil Kleiman reports a relationship with Abbott that includes: funding grants. Dr. Reardon discloses consultancy roles with Medtronic, Boston Scientific, Abbott, and W L Gore & Associates. Dr. Atkins is a consultant for W L Gore & Associates. Dr. Kleiman is a local principal investigator for trials sponsored by Boston Scientific, Medtronic, Abbott, and Edwards Lifesciences. Dr. Goel is a consultant for Medtronic, JC Medical, and W L Gore & Associates and is also on the Speakers Bureau for Abbott Structural Heart. If there are other authors, they declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Published by Elsevier Inc.)
- Published
- 2024
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- View/download PDF
47. Personalized azithromycin treatment rules for children with watery diarrhea using machine learning.
- Author
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Kim SS, Codi A, Platts-Mills JA, Pavlinac P, Manji K, Sudfeld C, Duggan CP, Dube Q, Bar-Zeev N, Kotloff K, Sow SO, Sazawal S, Singa BO, Walson J, Qamar F, Ahmed T, De Costa A, Benkeser D, and Rogawski McQuade ET
- Abstract
Introduction: We used machine learning to identify novel strategies to target azithromycin to the children with watery diarrhea who are most likely to benefit., Methods: Using data from a randomized trial of azithromycin for watery diarrhea, we developed personalized treatment rules given sets of diagnostic, child, and clinical characteristics, employing a robust ensemble machine learning-based procedure. For each rule, we estimated the proportion treated under the rule and the average benefits of treatment., Results: Among 6,692 children, treatment was recommended on average for approximately one third of children. The risk of diarrhea on day 3 was 10.1% lower (95% CI: 5.4, 14.9) with azithromycin compared to placebo among children recommended for treatment. For day 90 re-hospitalization and death, risk was 2.4% lower (95% CI: 0.6, 4.1) with azithromycin compared to placebo among those recommended for treatment. While pathogen diagnostics were strong determinants of azithromycin effects on diarrhea duration, host characteristics were more relevant for predicting benefits for re-hospitalization or death., Conclusion: The ability of host characteristics to predict which children benefit from azithromycin with respect to the most severe outcomes suggests appropriate targeting of antibiotic treatment among children with watery diarrhea may be possible without access to pathogen diagnostics.
- Published
- 2024
- Full Text
- View/download PDF
48. Meta-Analysis of Dedicated vs Off-Label Transcatheter Devices for Native Aortic Regurgitation.
- Author
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Samimi S, Hatab T, Kharsa C, Khan SU, Bou Chaaya RG, Qamar F, Aoun J, Zaid S, Faza N, Atkins MD, Little SH, Zoghbi WA, Reardon MJ, Kleiman NS, and Goel SS
- Abstract
Background: Transcatheter aortic valve replacement (TAVR) for high surgical risk patients with severe native aortic regurgitation (AR) presents unique challenges. Dedicated devices such as the JenaValve (JenaValve Technology) and J-Valve (JC Medical Inc) show promising results in addressing these challenges., Objectives: This study compares the safety and efficacy of dedicated vs off-label devices among high surgical risk patients with pure native AR., Methods: We systematically searched PubMed, EMBASE, and Cochrane Central Register of Controlled Trials through July 11, 2024, for studies on TAVR among patients with pure severe native AR. The primary endpoint was 30-day all-cause mortality. Secondary endpoints were device success, residual AR ≥ moderate, valve embolization/migration, pacemaker implantation, reintervention, and all-cause mortality at 1 year. Summary estimates were constructed using a random effects model., Results: A total of 34 studies encompassing 2,162 patients (mean age 75.4 ± 0.2, 42.8% women) were included in the meta-analysis. Patients undergoing TAVR with dedicated devices had a lower all-cause 30-day mortality rate (3% vs 9%; P < 0.01) and higher device success (93% vs 82%; P < 0.01) compared with off-label devices. The risk of AR ≥ moderate (2% vs 5%; P = 0.03), valve embolization/migration (2% vs 8%; P < 0.01), pacemaker implantation (11% vs 20%; P < 0.01), and reintervention (4% vs 10%; P < 0.01) at 30 days and all-cause mortality at 1 year (6% vs 24%; P < 0.01) were lower in the dedicated device group., Conclusions: Dedicated TAVR devices for native AR show superior device success and reduced mortality, residual AR, and reintervention rates compared with off-label devices. These findings support the use of dedicated devices as a safer alternative for high-risk patients., Competing Interests: Funding Support and Author Disclosures Dr Atkins is a consultant for W. L. Gore & Associates. Dr Reardon is a consultant for Medtronic, Boston Scientific, Abbott, and W. L. Gore & Associates. Dr Kleiman is a local principal investigator for trials sponsored by Boston Scientific, Medtronic, Abbott, and Edwards Lifesciences. Dr Goel is a consultant for Medtronic, JC Medical, Boston Scientific, and W. L. Gore & Associates; and also serves on the Speakers Bureau for Abbott Structural Heart. All other authors have reported that they have no relationships relevant to the contents of this paper to disclose., (Published by Elsevier Inc.)
- Published
- 2024
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49. Improving organoleptic and antioxidant properties by inhibition of novel miRstv_7 to target key genes of steviol glycosides biosynthetic pathway in Stevia rebaudiana Bertoni.
- Author
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Ashrafi K, Iqrar S, Qamar F, Saifi M, Quadri SN, and Abdin MZ
- Subjects
- Glucosides metabolism, Glucosides biosynthesis, Plants, Genetically Modified, Sweetening Agents pharmacology, Sweetening Agents metabolism, Gene Expression Regulation, Plant, Plant Leaves metabolism, Plant Leaves genetics, Glycosides biosynthesis, Glycosides metabolism, Stevia genetics, Stevia metabolism, Diterpenes, Kaurane metabolism, Antioxidants metabolism, MicroRNAs genetics, MicroRNAs metabolism, Biosynthetic Pathways genetics
- Abstract
Stevioside (5-10%) and rebaudioside-A (2-4%) are well-characterized diterpene glycosides found in leaves of Stevia rebaudiana known to have natural sweetening properties with zero glycaemic index. Stevioside has after-taste bitterness, whereas rebaudioside-A is sweet in taste. The ratio of rebaudioside-A to stevioside needs to be changed in order to increase the effectiveness and palatability of this natural sweetener. Plant-specific miRNAs play a significant role in the regulation of metabolic pathways for the biosynthesis of economically important secondary metabolites. In this study inhibition of miRNA through antisense technology was employed to antagonize the repressive action of miRstv_7 on its target mRNAs involved in the steviol glycosides (SGs) biosynthesis pathway. In transgenic plants expressing anti-miRstv_7, reduced expression level of endogenous miRstv_7 was observed than the non-transformed plants. As a result, enhanced expression of target genes, viz. KO (Kaurene oxidase), KAH (Kaurenoic acid-13-hydroxylase), and UGT76G1 (UDP-glycosyltransferase 76G1) led to a significant increase in the rebaudioside-A to stevioside ratio. Furthermore, metabolome analysis revealed a significant increase in total steviol glycosides content as well as total flavonoids content. Thus, our study can be utilized to generate more palatable varieties of Stevia with improved nutraceutical values including better organoleptic and antioxidant properties., (© 2024. The Author(s), under exclusive licence to Springer Nature B.V.)
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- 2024
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50. Regulatory trends in engineering bioactive-phytocompounds.
- Author
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Saifi M, Ashrafi K, Qamar F, and Abdin MZ
- Subjects
- Metabolic Engineering, Plants metabolism, Plants genetics, Secondary Metabolism, Phytochemicals metabolism
- Abstract
The secondary plant metabolites are of enormous importance because of their extensive medicinal, nutraceutical, and industrial applications. In plants, these secondary metabolites are often found in extremely small amounts, therefore, following the discovery of any prospective metabolite, the main constraining element is the ability to generate enough material for use in both industrial and therapeutic settings. In order to satisfy the rising demand for value-added metabolites, researchers prefer to use different molecular approaches for scalable and sustainable production of these phytocompounds. Here, we discuss the emerging regulatory trends in engineering these bioactive-phytocompounds and provide recommendation on successful employment of these state-of-the-art technologies for translation of these academic researches into novel process and products., Competing Interests: Declaration of Competing Interest The authors declare no conflict of interests., (Copyright © 2024 Elsevier B.V. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
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