24 results on '"Stephens MS"'
Search Results
2. User-Informed Medical Device Development: A Case Study for Pediatric Malnutrition Assessment
- Author
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Kristi Thaete MS, Kasey Rowzer MS, Karen Stephens MS, and Susan M. Abdel-Rahman PharmD
- Subjects
Pediatrics ,RJ1-570 - Abstract
Background . Mid-upper arm circumference (MUAC) has been extensively used to classify pediatric malnutrition. Recently, MUAC z score was recommended; however, the logistics of implementation were not addressed. This study examines the usability of a device that provides MUAC and corresponding z score range in a single device. Methods. This was a single-center study of nutrition services providers. The device was applied to children aged 2 months to 18 years admitted as inpatients or seen as outpatients. Surveys incorporated benchmarking questions, assessed the ease with which respondents could perform 6 critical tasks, and provided an open-ended question to elicit feedback. Users were surveyed monthly until saturation was reached. Survey data were analyzed in aggregate and cross-tabulated by the respondents’ experience with the device. Thematic analysis of the open-ended responses followed a structured approach. Results. Sixty device users responded to the survey 280 times. Respondents were female (100%) with a mean age of 45.2 ± 13.2 years and 9.6 ± 8.0 years in practice. Increasing device use was accompanied by significantly shortened measuring times ( P < .001) and shifts in ease of performance for 5 of 6 critical tasks ( P < .05). Open-ended response themes related largely to design and materials. These were used to iteratively refine the device. Conclusions . The active engagement of end users in the real-world testing of our nutritional assessment device allowed us to refine the innovation with special attention paid to the needs of dietitians. The result is a device the majority of dietitians found easy to use, efficient, convenient, and preferable to alternative measurement options.
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- 2019
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3. Examining the Intersection Between Suicidal Behaviors and Intimate Partner Violence Among a Sample of Males Receiving Services From the Veterans Health Administration
- Author
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Catherine Cerulli JD, PhD, Brady Stephens MS, and Robert Bossarte PhD
- Subjects
Medicine - Abstract
Veterans comprise 10% of the population, and suicide among Veterans has garnered national media and policy attention. Existing research suggests that intimate partner violence (IPV) is a risk factor for suicidal behaviors among some high-risk populations. This report offers a new perspective: the intersection between Veterans’ suicidal thoughts and IPV, both victimization and perpetration. The data were obtained from a northeast telephone survey of Veterans ( n = 296) using Veterans Health Administration services and yielded a 27% participation rate. Findings suggest male Veterans who are IPV involved have increased odds of suicidal thoughts and behaviors.
- Published
- 2014
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4. Estimates of the Demand for Freight Transport in the Nigerian Food Industry
- Author
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Stephens, MS and Ikeogu, CC
- Abstract
Previous work on the demand for freight transportation has focused on the rail-truck substitution problem, excluding the prior private versus public trade-off, often found in transportation decision-making. Moreover, those studies that actually examine this alternative selection problem fail to consider the interdependence between the transport type choice and the shipment size decision. The purpose of this paper is to analyze shippers’ behavior. Particular attention is paid to, first, the public-private trade-off and, second, the simultaneity of alternative selection and shipment size choice. In order to provide a quantitative evaluation, as an illustrative case, the theoretical model developed was tested on data gathered by means of a sample survey conducted to Nigerian enterprises belonging to the food industry. The empirical findings showed that, all else equal, public transport is favored over private transport and that the probability of selecting purchased transport increases with transport costs and travel time. Keywords: Nigerian food industry, freight transport, shipment, rail-truck
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- 2012
5. A Comparative Analysis of Analog and Digital Gantries in Nigeria’s Hydrocarbon Depot Management
- Author
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Ikeogu, CC, primary, Ugboaja, PC, additional, Stephens, MS, additional, and Ukpere, WI, additional
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- 2013
- Full Text
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6. Training for Abusive Caregivers
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Colleen Beall Msw, John M. Bolland, Forrest Scogin, Gretchen Stephens Ms, Nicholas Philip Grote Dsw, Lorin A. Baumhover, and Jerry Bynum Ms
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medicine.medical_specialty ,Anger management ,medicine.medical_treatment ,Psychological distress ,Elder abuse ,Mental health ,Intervention (counseling) ,medicine ,Geriatrics and Gerontology ,Training program ,Psychology ,Psychiatry ,Psychological abuse ,Psychosocial ,Social Sciences (miscellaneous) ,Clinical psychology - Abstract
This article proposes a model for elder abuse intervention based on a recently implemented caregiver training program. Caregivers at-risk for abuse were offered traiing through mental health centers on biopsychocosil issues in aging, problem-solving, stress and anger management, and utilization of community resources. Participants were compared with similar caregivers on measures of psychosocial well-being to examine the efficacy of training. Participants experienced some reduction in symptoms of psychological distress and caregiving burden over time while symptoms worsened or remained unchanged for non-participants. Suggestions are made for utilizing this approach in cases of founded abuse.
- Published
- 1989
7. Machine Learning Algorithm-Aided Determination of Predictors of Mortality from Diabetic Foot Sepsis at a Regional Hospital in South Africa During the COVID-19 Pandemic.
- Author
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Matsinhe C, Kagodora SB, Mukheli T, Mokoena TP, Malebati WK, Moeng MS, and Luvhengo TE
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- Humans, Male, Middle Aged, Female, South Africa epidemiology, Aged, Adult, SARS-CoV-2, Algorithms, Pandemics, Hospital Mortality, Retrospective Studies, COVID-19 mortality, COVID-19 complications, COVID-19 blood, Diabetic Foot mortality, Diabetic Foot surgery, Machine Learning, Amputation, Surgical statistics & numerical data, Amputation, Surgical mortality, Sepsis mortality, Sepsis blood
- Abstract
Background and Objectives : Diabetic foot sepsis (DFS) accounts for approximately 60% of hospital admissions in patients with diabetes mellitus (DM). Individuals with DM are at risk of severe COVID-19. This study investigated factors associated with major amputation and mortality in patients admitted with DFS during the COVID-19 pandemic. Materials and Methods : Demographic information, COVID-19 and HIV status, clinical findings, laboratory results, treatment and outcome from records of patients with diabetic foot sepsis, were collected and analysed. Supervised machine learning algorithms were used to compare their ability to predict mortality due to diabetic foot sepsis. Results : Overall, 114 records were found and 57.9% (66/114) were of male patients. The mean age of the patients was 55.7 (14) years and 47.4% (54/114) and 36% (41/114) tested positive for COVID-19 and HIV, respectively. The median c-reactive protein was 168 mg/dl, urea 7.8 mmol/L and creatinine 92 µmol/L. The mean potassium level was 4.8 ± 0.9 mmol, and glycosylated haemoglobin 11.2 ± 3%. The main outcomes included major amputation in 69.3% (79/114) and mortality of 37.7% (43/114) died. AI. The levels of potassium, urea, creatinine and HbA1c were significantly higher in the deceased. Conclusions : The COVID-19 pandemic led to an increase in the rate of major amputation and mortality in patients with DFS. The in-hospital mortality was higher in patients above 60 years of age who tested positive for COVID-19. The Random Forest algorithm of ML can be highly effective in predicting major amputation and death in patients with DFS.
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- 2024
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8. Holomics and Artificial Intelligence-Driven Precision Oncology for Medullary Thyroid Carcinoma: Addressing Challenges of a Rare and Aggressive Disease.
- Author
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Luvhengo TE, Moeng MS, Sishuba NT, Makgoka M, Jonas L, Mamathuntsha TG, Mbambo T, Kagodora SB, and Dlamini Z
- Abstract
Background/Objective: Medullary thyroid carcinoma (MTC) is a rare yet aggressive form of thyroid cancer comprising a disproportionate share of thyroid cancer-related mortalities, despite its low prevalence. MTC differs from other differentiated thyroid malignancies due to its heterogeneous nature, presenting complexities in both hereditary and sporadic cases. Traditional management guidelines, which are designed primarily for papillary thyroid carcinoma (PTC), fall short in providing the individualized care required for patients with MTC. In recent years, the sheer volume of data generated from clinical evaluations, radiological imaging, pathological assessments, genetic mutations, and immunological profiles has made it humanly impossible for clinicians to simultaneously analyze and integrate these diverse data streams effectively. This data deluge necessitates the adoption of advanced technologies to assist in decision-making processes. Holomics, which is an integrated approach that combines various omics technologies, along with artificial intelligence (AI), emerges as a powerful solution to address these challenges. Methods: This article reviews how AI-driven precision oncology can enhance the diagnostic workup, staging, risk stratification, management, and follow-up care of patients with MTC by processing vast amounts of complex data quickly and accurately. Articles published in English language and indexed in Pubmed were searched. Results: AI algorithms can identify patterns and correlations that may not be apparent to human clinicians, thereby improving the precision of personalized treatment plans. Moreover, the implementation of AI in the management of MTC enables the collation and synthesis of clinical experiences from across the globe, facilitating a more comprehensive understanding of the disease and its treatment outcomes. Conclusions: The integration of holomics and AI in the management of patients with MTC represents a significant advancement in precision oncology. This innovative approach not only addresses the complexities of a rare and aggressive disease but also paves the way for global collaboration and equitable healthcare solutions, ultimately transforming the landscape of treatment and care of patients with MTC. By leveraging AI and holomics, we can strive toward making personalized healthcare accessible to every individual, regardless of their economic status, thereby improving overall survival rates and quality of life for MTC patients worldwide. This global approach aligns with the United Nations Sustainable Development Goal 3, which aims to ensure healthy lives and promote well-being at all ages.
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- 2024
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9. Small bowel mucormycosis: An unexpected case in a penetrating trauma survivor.
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Bhana M, Laher N, McGrath NG, and Moeng MS
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Introduction: Small bowel mucormycosis is a rare entity with few reports in the literature. Mortality rates secondary to necrosis and perforation remain above 85 %, with an increase in populations at risk noted., Presentation of Case: This is a case report of a survivor of penetrating trauma who sustained small bowel injuries and was managed with damage control surgery. He required relook laparotomies due to extensive contamination and subsequently developed progressive ischaemia and necrosis of areas of his small bowel - histology confirming mucormycosis. There were no apparent risk factors noted in this case. Early addition of Amphotericin B and prompt surgical management resulted in a positive outcome. The patient was discharged from the hospital successfully. No further complications were noted post-discharge., Discussion: Small bowel mucormycosis can be a challenging diagnosis and requires a high index of suspicion. The lack of traditional risk factors should not deter a surgeon from considering this diagnosis in trauma patients as the micro-invasive properties of this organism can result in unexpected gastrointestinal ischaemia. Favourable outcomes are associated with prompt surgical debridement, histopathological diagnosis, and appropriate antifungal therapy., Conclusion: Gastrointestinal Mucormycosis is a diagnosis that should be considered in trauma patients with unusual patterns of ischaemia. Prompt therapy can result in positive outcomes., Competing Interests: Conflict of interest statement The authors did not require any funding and have no conflicts of interest to declare., (Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2023
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10. The Role for Preperitoneal Pelvic Packing in Low-to-Middle-Income Countries: A 16-Year Experience at a Johannesburg Trauma Unit.
- Author
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Moeng MS, Viljoen F, and Makhadi S
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- Male, Humans, Female, Adult, Middle Aged, Retrospective Studies, Trauma Centers, Developing Countries, Hemostatic Techniques, Treatment Outcome, South Africa, Pelvis, Hemorrhage etiology, Hemorrhage therapy, Fractures, Bone surgery, Pelvic Bones injuries
- Abstract
Introduction: Preperitoneal pelvic packing for early pelvic haemorrhage control reduces mortality. Bleeding noted with pelvis fractures is predominantly due to associated venous complex injuries. More studies are advocating for angiography as first-line therapy for haemodynamic instability in pelvic fractures; however, these facilities are not in abundance in middle- and low-income countries. We hypothesized that PPP improves outcomes under these circumstances., Methods: Retrospective analysis of data from the patients charts over a period of 16 years from 01 January, 2005 to 31 December, 2020. All patients over the age of 18 years who presented with haemodynamic instability from a pelvic fracture and required PPP were included. The demographics, physiological parameter in emergency department, blood products transfused, morbidity and mortality were analysed., Results: There were 110 patients identified in the study period who underwent pelvic preperitoneal packing for refractory shock or ongoing bleeding. The majority (75.5%) of patients were men (n = 83). The median age was 38 years. The most common mechanism of injury was pedestrian vehicle collision (51%), followed by motor vehicle collisions (27.3%). The median ISS and NISS were 35 and 40, respectively. The median RTS in ED was 4.8(3-6.8). None of our patients rebleed after pack removal and no one needed repacking or adjunct angioembolization in our study group. The in-hospital mortality rate was 43.6% (n = 48) in patients who underwent preperitoneal pelvic packing. The operating room table mortality was 20% (n = 22/110), and the mortality rate of those who survived to ICU transfer was 29.5% (n = 26/88)., Conclusions: Pelvic preperitoneal packing has a role in the acute management of haemodynamically abnormal patients with pelvic fractures in our environment. In the absence of immediate angioembolization, preperitoneal packing can be lifesaving., (© 2023. The Author(s).)
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- 2023
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11. Multi-Omics and Management of Follicular Carcinoma of the Thyroid.
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Luvhengo TE, Bombil I, Mokhtari A, Moeng MS, Demetriou D, Sanders C, and Dlamini Z
- Abstract
Follicular thyroid carcinoma (FTC) is the second most common cancer of the thyroid gland, accounting for up to 20% of all primary malignant tumors in iodine-replete areas. The diagnostic work-up, staging, risk stratification, management, and follow-up strategies in patients who have FTC are modeled after those of papillary thyroid carcinoma (PTC), even though FTC is more aggressive. FTC has a greater propensity for haematogenous metastasis than PTC. Furthermore, FTC is a phenotypically and genotypically heterogeneous disease. The diagnosis and identification of markers of an aggressive FTC depend on the expertise and thoroughness of pathologists during histopathological analysis. An untreated or metastatic FTC is likely to de-differentiate and become poorly differentiated or undifferentiated and resistant to standard treatment. While thyroid lobectomy is adequate for the treatment of selected patients who have low-risk FTC, it is not advisable for patients whose tumor is larger than 4 cm in diameter or has extensive extra-thyroidal extension. Lobectomy is also not adequate for tumors that have aggressive mutations. Although the prognosis for over 80% of PTC and FTC is good, nearly 20% of the tumors behave aggressively. The introduction of radiomics, pathomics, genomics, transcriptomics, metabolomics, and liquid biopsy have led to improvements in the understanding of tumorigenesis, progression, treatment response, and prognostication of thyroid cancer. The article reviews the challenges that are encountered during the diagnostic work-up, staging, risk stratification, management, and follow-up of patients who have FTC. How the application of multi-omics can strengthen decision-making during the management of follicular carcinoma is also discussed.
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- 2023
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12. Development and Evaluation of Bluetooth Low-Energy Device for Electronic Encounter Metrics.
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Keenan KE, Aumentado J, Booth H, Briggman KA, Kraft M, Martin MN, Peralta RC, Robinson AY, Shalm K, Stephens MS, Townsend EA, and Nam SW
- Abstract
The coronavirus disease 2019 (COVID-19) pandemic led to the need for tracking of physical contacts and potential exposure to disease. Traditional contact tracing can be augmented by electronic tools called "electronic contact tracing" or "exposure notification.". Some methods were built to work with smartphones; however, smartphones are not prevalent in some high-contact areas (e.g., schools and nursing homes). We present the design and initial testing of low-cost, highly privacy preserving wearable exposure notification devices. Several devices were constructed based on existing hardware and operated independently of a smartphone. The method (devices and analyses) was not able to reliably use the received signal strength indicator (RSSI) as a proxy for distance between pairs of devices; the accuracy of RSSI as a proxy for distance decreased dramatically outside of the idealized conditions. However, even an imperfect device could be useful for research on how people use and move through spaces. With some improvement, these devices could be used to understand disease spread and human or animal interaction in indoor environments.
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- 2022
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13. Generalized Electrical Substitution Methods and Detectors for Absolute Optical Power Measurements.
- Author
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Woods SI, Neira JE, Proctor JE, Rice JP, Tomlin NA, White MG, Stephens MS, and Lehman JH
- Abstract
We have developed generalized methods for electrical substitution optical measurements, as well as cryogenic detectors which can be used to implement them. The new methods detailed here enable measurement of arbitrary periodic waveforms by an electrical substitution radiometer (ESR), which means that spectral and dynamic optical power can be absolutely calibrated directly by a primary standard detector. Cryogenic ESRs are not often used directly by researchers for optical calibrations due to their slow response times and cumbersome operation. We describe two types of ESRs with fast response times, including newly developed cryogenic bolometers with carbon nanotube absorbers, which are manufacturable by standard microfabrication techniques. These detectors have response times near 10 ms, spectral coverage from the ultraviolet to far-infrared, and are ideal for use with generalized electrical substitution. In our first tests of the generalized electrical substitution method with FTS, we have achieved uncertainty in detector response of 0.13 % (k=1) and total measurement uncertainty of 1.1 % (k=1) in the mid-infrared for spectral detector responsivity calibrations. The generalized method and fast detectors greatly expand the range of optical power calibrations which can be made using a wideband primary standard detector, which can shorten calibration chains and improve uncertainties.
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- 2022
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14. Unsupervised domain adaptation for the segmentation of breast tissue in mammography images.
- Author
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Ryan F, Román KL, Gerbolés BZ, Rebescher KM, Txurio MS, Ugarte RC, González MJG, and Oliver IM
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- Adipose Tissue, Breast diagnostic imaging, Breast Density, Image Processing, Computer-Assisted, Mammography
- Abstract
Background and Objective: Breast density refers to the proportion of glandular and fatty tissue in the breast and is recognized as a useful factor assessing breast cancer risk. Moreover, the segmentation of the high-density glandular tissue from mammograms can assist medical professionals visualizing and localizing areas that may require additional attention. Developing robust methods to segment breast tissues is challenging due to the variations in mammographic acquisition systems and protocols. Deep learning methods are effective in medical image segmentation but they often require large quantities of labelled data. Unsupervised domain adaptation is an area of research that employs unlabelled data to improve model performance on variations of samples derived from different sources., Methods: First, a U-Net architecture was used to perform segmentation of the fatty and glandular tissues with labelled data from a single acquisition device. Then, adversarial-based unsupervised domain adaptation methods were used to incorporate single unlabelled target domains, consisting of images from a different machine, into the training. Finally, the domain adaptation model was extended to include multiple unlabelled target domains by combining a reconstruction task with adversarial training., Results: The adversarial training was found to improve the generalization of the initial model on new domain data, demonstrating clearly improved segmentation of the breast tissues. For training with multiple unlabelled domains, combining a reconstruction task with adversarial training improved the stability of the training and yielded adequate segmentation results across all domains with a single model., Conclusions: Results demonstrated the potential for adversarial-based domain adaptation with U-Net architectures for segmentation of breast tissue in mammograms coming from several devices and demonstrated that domain-adapted models could achieve a similar agreement with manual segmentations. It has also been found that combining adversarial and reconstruction-based methods can provide a simple and effective solution for training with multiple unlabelled target domains., 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 © 2021 Elsevier B.V. All rights reserved.)
- Published
- 2021
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15. High-accuracy room temperature planar absolute radiometer based on vertically aligned carbon nanotubes.
- Author
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Vaskuri AK, Stephens MS, Tomlin NA, Spidell MT, Yung CS, Walowitz AJ, Straatsma C, Harber D, and Lehman JH
- Abstract
We have developed a planar absolute radiometer for room temperature (PARRoT) that will replace the legacy C-series calorimeter as the free-space continuous-wave laser power detector standard at the National Institute of Standards and Technology (NIST). This instrument will lower the combined relative expanded measurement uncertainty (k = 2) from 0.84 % to 0.13 %. PARRoT's performance was validated by comparing its response against a transfer standard silicon trap detector traceable to NIST's primary standard laser optimized cryogenic radiometer (LOCR) and against the C-series calorimeter. On average, these comparisons agreed to better than 0.008 % and 0.05 %, respectively.
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- 2021
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16. Out of the Loop: The Value of a Preoperative Loopogram for Colostomy Reversal in Trauma.
- Author
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Morare NMT, Motha MN, and Moeng MS
- Subjects
- Anastomosis, Surgical, Humans, Postoperative Complications surgery, Reoperation, Retrospective Studies, South Africa, Colostomy, Wounds, Gunshot
- Abstract
Background: Stoma is occasionally fashioned during trauma surgery. A loopogram is routinely conducted in the surgical planning for stoma reversal. This is associated with medical and cost implications. A study was undertaken to evaluate the influence of loopograms on the management of trauma patients at a Johannesburg hospital., Methods: A retrospective analysis of records in the stoma database (January 2013 to December 2018) was conducted. The patient demographics, method of injury, stoma-type, loopogram findings and post-operative courses were analysed., Results: 112 records were obtained. 9 (8%) patients were excluded for pending investigations or surgery. 13 (11.6%) patients were excluded for incomplete data. The remaining 90 (80.3%) patients, with a mean age of 32.9 had non-contributory loopograms and underwent a reversal procedure. 43 (47.8%) had a loop colostomy while 47 (52.2%) had undergone a Hartmann's procedure. Mechanism of injury was stab wounds (81.4%L; 61.7%H); gunshot wounds (13.9%L; 29.7%H) and blunt trauma (L5% and 9%H). The post-operative complication rate was 30% for the loop group (2.3% ≥ Clavien-Dindo 3) and 25.5% for the Hartmann's group (4% ≥ Clavien-Dindo 3). The average timing to reversal was 38 weeks (range 12-60) in the Hartmann's group and 22 weeks (range 12-32) the loop colostomy group., Conclusion: Significant findings are infrequent on loopogram for trauma patients. When these findings are detected, the effect on management is questionable. They are not without complications and have cost and time implications. Loopograms are helpful in selective cases rather than as a routine investigation, particularly in resource-limited settings.
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- 2021
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17. Nature of fiber-coupled detector responsivity measurements at 0.1% using a primary standard.
- Author
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White MG, Baumann E, Vayshenker I, Ruiz ZE, Stephens MS, Smid M, and Lehman JH
- Abstract
We demonstrate the capability to measure the absolute power responsivity of optical fiber-coupled detectors at an expanded uncertainty of 0.1%, by direct comparison with a cryogenic primary standard. To facilitate synchronous power measurements, commercial all-fiber beam-splitters direct laser diode light simultaneously to the device under test and the primary standard. We investigate the use of single-mode, polarisation maintaining, and photonic crystal fibers to access the cryogenic standard, and report a reduction in the temperature dependent effective refractive index of these fibers of 0.1%, 0.15% and 0.3% respectively in going from room temperature to 5 K. We also evaluate the polarisation dependent loss of the beam-splitters, the stability of the beam-splitter ratio between the cryogenic detector and the device under test and the temporal and modal stability of the Fabry-Pérot laser diode sources. It is shown that the stability of the optical fiber beam-splitters limits the overall performance of the measurement system to an expanded uncertainty of 0.1%.
- Published
- 2020
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18. Unusual case of a migrating spinal bullet: An opportunity for reflection.
- Author
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Morare N and Moeng MS
- Abstract
The following case report documents the presentation of a 28 year old male who presented to the Charlotte Maxeke Johannesburg Academic Hospital (CMJAH) trauma unit following a single gunshot wound to the spine. He presented walking, with no neurological dysfunction. On further investigation he was found to have a retained bullet at the L3 level of the spinal canal, which migrated within the canal from its initial point of entry. He was subsequently taken for a laminectomy and bullet removal under fluoroscopic guidance. Post operatively he was noted to have reduced proprioception bilaterally., Competing Interests: Nil to declare., (© 2020 The Author(s).)
- Published
- 2020
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19. Primary repair of a delayed presentation thoracic oesophageal gunshot injury: A report of two cases.
- Author
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Omura T, Asieri M, Bischof K, Rambarran S, and Moeng MS
- Abstract
Thoracic oesophageal gunshot injuries are uncommon, and the morbidity and mortality rates are extremely high and depend on the elapsed time, injury severity, and concomitant organ damage. Thus, early diagnosis is paramount to avoid delays, which in turn confer poorer outcomes. Current management strategies are still controversial and depend on the patient's physiologic state. We experienced two cases of thoracic oesophageal gunshot injury, both of whom were treated by primary repair and were successfully discharged. Decision-making strategies should be based on the patient's physiologic reserve, experience of the attending surgical team, and ancillary services available at the facility.
- Published
- 2017
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20. The authors reply.
- Author
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Conrad SA, Grier LR, Scott LK, Green R, and Stephens MS
- Subjects
- Female, Humans, Male, Catheterization methods, Extracorporeal Membrane Oxygenation methods, Heart Failure therapy, Intensive Care Units, Respiratory Insufficiency therapy
- Published
- 2015
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21. Mitigating the effects of the green alga Scenedesmus quadricauda on the efficacy of Bacillus thuringiensis var. israelensis against larval black flies.
- Author
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Overmyer JP, Stephens MS, Gray EW, and Noblet R
- Subjects
- Animals, Larva, Time Factors, Bacillus thuringiensis, Pest Control, Biological methods, Scenedesmus, Simuliidae
- Abstract
The green alga Scenedesmus quadricauda has been shown to decrease the efficacy of Bacillus thuringiensis var. israelensis (Bti) to black fly larvae in laboratory experiments. In this study, 2 approaches to mitigating the effects of S. quadricauda were tested, increasing the dose of Bti exposed to the larval black flies and increasing the length of the exposure period. Results showed that increasing the dose as well as increasing the exposure time were effective methods for mitigating the effects of S. quadricauda on Bti efficacy. Assessment of larval mortality at different exposure periods to Bti indicate that the manifestation of toxicity or acquisition of toxic doses of the Bti formulation takes place approximately 2-3 times slower when S. quadricauda is present. These results provide information that might be useful in developing a plan of action to combat this complex situation in field operations.
- Published
- 2006
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22. Effects of algae on the efficacy of Bacillus thuringiensis var. israelensis against larval black flies.
- Author
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Stephens MS, Overmyer JP, Gray EW, and Noblet R
- Subjects
- Animals, Bacillus thuringiensis, Chlorella, Scenedesmus, Chlorophyta, Cyanobacteria, Pest Control, Biological, Simuliidae
- Abstract
Personnel from several black fly control programs have reported that the efficacy of Bacillus thuringiensis var. israelesis (Bti) is reduced during periods when algal concentrations are high in the waterways. Although the reduction in Bti-induced mortality in black fly larvae is presumed to be related to the presence of algae, no scientific data support this theory. In this study, 4 genera of algae (Microcytis, Scenedesmus, Dictrosphaerium, and Chlorella) commonly detected in Pennsylvania rivers where Bti-induced mortality in black fly larvae has been reduced were assessed to determine their respective effects on Bti-induced mortality by using an orbital shaker bioassay with laboratory-reared black fly larvae (Simulium vittatum cytospecies IS-7). A significant reduction in Bti-induced mortality was observed when Scenedesmus was present in the flasks at concentrations > or = 16,000 cells/ml. The Bti-induced mortality of larvae was not significantly reduced when Chlorella, Dictyosphaerium, or Microcytis was present in the flasks, even at concentrations > or = 250,000 cells/ml. These results indicate that the presence of certain types of algae can reduce the mortality of black flies exposed to Bti. Although not clearly defined, the mechanisms involved may be related to algal morphology due to overall size and structures associated with certain types of algae, and possible interference with feeding.
- Published
- 2004
23. Converting a bachelor of health sciences course on communication skills to a CD-ROM format.
- Author
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Ricciardone EB, Martin MS, Mauldin MP, and Shilling LM
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- Adult, Attitude, Computer-Assisted Instruction methods, Female, Humans, Internet statistics & numerical data, Male, Retrospective Studies, Students, Health Occupations psychology, CD-ROM statistics & numerical data, Communication, Curriculum, Education, Professional methods
- Published
- 2003
24. Letters to the editor.
- Author
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Murray JG, Miller SS, Stephens MS, Pickard WB, Saly MD, Wilson TD, and Eggert A
- Published
- 1992
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