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740 results on '"Shah, Amar"'

202. ACR Appropriateness Criteria® Nonischemic Myocardial Disease With Clinical Manifestations (Ischemic Cardiomyopathy Already Excluded)

Author

Mammen, Leena, primary, Woodard, Pamela K., additional, Abbara, Suhny, additional, Dorbala, Sharmila, additional, Javidan-Nejad, Cylen, additional, Julsrud, Paul R., additional, Kirsch, Jacobo, additional, Kramer, Christopher M., additional, Krishnamurthy, Rajesh, additional, Laroia, Archana T., additional, Shah, Amar B., additional, Vogel-Claussen, Jens, additional, and White, Richard D., additional

Published
2014
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207. Cardiac hemangioma mimicking a neuroendocrine tumor on 68Ga Dotatate PET/CT.

Author

Shah, Amar, Binkovitz, Larry, Layman, Andrew J., Bois, Melanie C., and Nguyen, Ba

Abstract

Cardiac hemangioma is a rare, benign primary tumor characterized by endothelial proliferation. While reports of cardiac hemangiomas demonstrating 18F FDG avidity and other forms of hemangiomas showing 68Ga Dotatate avidity have been published, we present a rare case of primary cardiac hemangioma demonstrating 68Ga Dotatate avidity, mimicking a primary neuroendocrine tumor. [ABSTRACT FROM AUTHOR]

Published
2022
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208. Littoral cell angioma: A rare cause of pediatric thrombocytopenia

Author

Jasani, Mitul, Shah, Anirudh, and Shah, Amar

Subjects
Thrombocytopenia, Pediatrics, Health
Abstract

Byline: Mitul. Jasani, Anirudh. Shah, Amar. Shah Littoral cell angioma is a rare primary splenic vascular tumor, originating from the littoral cells lining the red pulp sinuses of the spleen, [...]

Published
2018

209. Additional file 1 of Is a differentiated care model needed for patients with TB? A cohort analysis of risk factors contributing to unfavourable outcomes among TB patients in two states in South India

Author

Washington, Reynold, Potty, Rajaram Subramanian, A. Rajesham, T. Seenappa, Singarajipura, Anil, Swamickan, Reuben, Shah, Amar, K. H. Prakash, Kar, Arin, Karthikeyan Kumaraswamy, B. S. Prarthana, Maryala, Bala Krishna, J. Sushma, Dasari, Ramesh, Bharath Shetty, Panibatla, Vikas, H. L. Mohan, and Becker, Marissa

Abstract

Additional file 1. Tool for risk and needs assessment (RANA).

Published
2020
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210. Image Guidance in Cranial Neurosurgery: How a Six-Ton Magnet and Fluorescent Colors Make Brain Tumor Surgery Better

Author

Chicoine, Michael R., Sylvester, Peter, Yahanda, Alexander T., and Shah, Amar

Subjects
Science of Medicine | Feature Series, Imaging, Three-Dimensional, Photosensitizing Agents, Surgery, Computer-Assisted, Brain Neoplasms, Brain, Humans, Aminolevulinic Acid, Glioma, Tomography, X-Ray Computed, Magnetic Resonance Imaging, Neurosurgical Procedures
Abstract

Maximal safe resection can improve patient outcomes for a variety of brain tumor types including low- and high-grade gliomas, pituitary adenomas, and other pathologies. Numerous intraoperative adjuncts exist to guide surgeons with maximizing extent of resection. Three distinct strategies exist including: 1) surgical navigation; 2) intraoperative imaging; and 3) tumor fluorescence. Surgical navigation involves registration of high-resolution three-dimensional imaging to the patient's cranial surface anatomy, allowing real-time localization of tumor and brain structures. Intraoperative imaging devices like intraoperative magnetic resonance imaging (iMRI), intraoperative computed tomography (iCT), 3-D fluoroscopy, and intraoperative ultrasonography (iUS) allow near real time visualization to assess the extent of resection. Intraoperative fluorescence via intravenous fluorescein or oral 5-aminolevulinic acid (5-ALA) causes brain tumors to "light up", which can be viewed through surgical optics using selective filters and specific wavelength light sources. A general overview, as well as implementation and utilization of some of these image guidance strategies at Washington University and by Siteman Cancer Center neurosurgeons at Barnes Jewish Hospital, is discussed in this review.

Published
2020

211. Additional file 2 of Is a differentiated care model needed for patients with TB? A cohort analysis of risk factors contributing to unfavourable outcomes among TB patients in two states in South India

Author

Washington, Reynold, Potty, Rajaram Subramanian, A. Rajesham, T. Seenappa, Singarajipura, Anil, Swamickan, Reuben, Shah, Amar, K. H. Prakash, Kar, Arin, Karthikeyan Kumaraswamy, B. S. Prarthana, Maryala, Bala Krishna, J. Sushma, Dasari, Ramesh, Bharath Shetty, Panibatla, Vikas, H. L. Mohan, and Becker, Marissa

Subjects
ComputerSystemsOrganization_MISCELLANEOUS, Data_FILES
Abstract

Additional file 2. Prevention Care and Support Card (PCS).

Published
2020
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212. Bayesian single- and multi- objective optimisation with nonparametric priors

Author

Shah, Amar

Subjects
machine learning, optimisation, sequential decision, Bayesian optimisation, single objective, Gaussian process, Bayesian, multiple objective
Abstract

Optimisation is integral to all sorts of processes in science, economics and arguably underpins the fruition of human intelligence through millions of years of optimisation, or $\textit{evolution}$. Scarce resources make it crucial to maximise their efficient usage. In this thesis, we consider the task of maximising unknown functions which we are able to query point-wise. The function is deemed to be $\textit{costly}$ to evaluate e.g. larger run time or financial expense, requiring a judicious querying strategy given previous observations. We adopt a probabilistic framework for modelling the unknown function and Bayesian non-parametric modelling. In particular, we focus on the $\textit{Gaussian process}$ (GP), a popular non-parametric Bayesian prior on functions. We motivate these choices and give an overview of the Gaussian process in the introduction, and its application to $\textit{Bayesian optimisation}$. A GP's behaviour is intimately controlled by the choice of $\textit{kernel}$ or covariance function, typically chosen to be a parametric function. In chapter 2 we instead place a non-parametric Bayesian prior, known as an Inverse Wishart process prior, over a GP kernel function, and show that this may be marginalised analytically leading to a $\textit{Student-$t$ process}$ (TP). Furthermore we explore a larger class of $\textit{elliptical processes}$, and show that the TP is the most general for which analytic calculation is possible, and apply it successfully for Bayesian optimisation. The remainder of the thesis focusses on various Bayesian optimisation settings. In chapter 3, we consider a setting where we are able to evaluate a function at multiple locations in parallel. Our approach is to consider a measure of information, $\textit{entropy}$, to decide which batch of points to evaluate a function at next. We similarly apply information gain for $\textit{multi-objective}$ Bayesian optimisation in chapter 4. Here, one wishes to find a $\textit{Pareto frontier}$ of efficient settings with respect to several different objectives through sequential evaluation. Finally, in chapter 5 we exploit the idea that in a multi-objective setting, functions are $\textit{correlated}$, incorporating this belief in our choice of prior distribution over the multiple objectives.

Published
2019
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213. Laparoscopic repair of a Morgagni diaphragmatic hernia in a child, using a trans-sternal technique

Author

Shah Amar and Jawaheer Girish

Subjects
Child, laparoscopy, Morgagni diaphragmatic hernia, Pediatrics, RJ1-570, Surgery, RD1-811
Abstract

Laparoscopic repair of Morgagni hernia has been described in adults and children. In the published reports, the crux of the repair consists of suturing the posterior part of the diaphragmatic defect to the undersurface of the sternum or the posterior rectus sheath. The tissue on the undersurface of the sternum is variable is in its nature and may be inadequate for suturing, hence compromising the strength of the repair. A technique that circumvents this problem and offers a strong anatomical repair is described. A Morgagni hernia was diagnosed in a 2-year-old girl with trisomy 21, who presented with recurrent chest infections. She underwent laparoscopic repair of the hernia using three ports. The tissue on the undersurface of the sternum was inadequate for a conventional repair. The procedure was modified as follows: a small transverse incision was made over the lower end of the sternum. Three nonabsorbable mattress sutures were inserted through the sternum, the anterior edge of the diaphragmatic defect, and back through the sternum and tied with extracorporeal knots. The child was discharged home on the second postoperative day. At 6-month follow up, the child was asymptomatic, and had been infection free. A chest radiograph was normal. This is a simple, novel, noninvasive method, which offers a secure anatomical repair and it is not dependent on the adequacy of the tissue on the undersurface of the sternum.

Published
2005

214. ACR Appropriateness Criteria Chronic Chest Pain—Low to Intermediate Probability of Coronary Artery Disease

Author

Woodard, Pamela K., primary, White, Richard D., additional, Abbara, Suhny, additional, Araoz, Philip A., additional, Cury, Ricardo C., additional, Dorbala, Sharmila, additional, Earls, James P., additional, Hoffmann, Udo, additional, Hsu, Joe Y., additional, Jacobs, Jill E., additional, Javidan-Nejad, Cylen, additional, Krishnamurthy, Rajesh, additional, Mammen, Leena, additional, Martin, Edward T., additional, Ryan, Thomas, additional, Shah, Amar B., additional, Steiner, Robert M., additional, Vogel-Claussen, Jens, additional, and White, Charles S., additional

Published
2013
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221. MRCP SCE in Respiratory Medicine: 300 SBAs

Author

Smith, Laura-Jane, Murray, James, Shah, Amar J, Smith, Laura-Jane, Murray, James, and Shah, Amar J

Subjects
Respiratory organs--Diseases--Examinations--Study guides
Abstract

MRCP SCE in Respiratory Medicine: 300 SBAs is a unique resource that offers a wealth of practice questions for candidates preparing for the Specialty Certificate Exam in Respiratory Medicine. Chapters in the book correspond to the topics in the syllabus, while the number of questions in each chapter is weighted in accordance with the College's exam blueprint. The book features questions written in line with relevant UK and international guidelines and is an indispensable revision aid designed to maximize the chances of exam success.

Published
2023

227. Use of 100 kV versus 120 kV in cardiac dual source computed tomography: effect on radiation dose and image quality

Author

Blankstein, Ron, primary, Bolen, Michael A., additional, Pale, Rodrigo, additional, Murphy, Meagan K., additional, Shah, Amar B., additional, Bezerra, Hiram G., additional, Sarwar, Ammar, additional, Rogers, Ian S., additional, Hoffmann, Udo, additional, Abbara, Suhny, additional, Cury, Ricardo C., additional, and Brady, Thomas J., additional

Published
2010
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233. Abstract 690: Variability and Predictors of Patient Radiation Dose with Dual Source Cardiac CT: Implications for Future Algorithms to Reduce Patient Radiation Dose

Author

Blankstein, Ron, primary, Pale, Rodrigo, additional, Nasir, Khurram, additional, Shah, Amar B, additional, Bezerra, Hiram, additional, Bolen, Michael, additional, Gupta, Rajiv, additional, Mamuya, Wilfred S, additional, Abbara, Suhny, additional, Brady, Thomas J, additional, and Cury, Ricardo C, additional

Published
2008
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234. Pediatric chylopericardium: Treatment conundrum

Author

Jasani, Mitul, Shah, Amar, and Shah, Anirudh

Subjects
Pediatrics, Health, Care and treatment
Abstract

Byline: Mitul. Jasani, Amar. Shah, Anirudh. Shah Primary chylopericardium is a rare entity in the pediatric population, which is characterized by chyle accumulation in the pericardial sac. Treatment of this [...]

Published
2018

238. Quality improvement at times of crisis.

Author

Shah, Amar, Pereira, Penny, and Tuma, Paula

Subjects
LEADERSHIP, MEDICAL care, COMMUNITY health services, ORGANIZATIONAL change, QUALITY assurance, COMMUNICATION, DECISION making, COVID-19 pandemic
Published
2021
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247. Quality of active case-finding for tuberculosis in India: a national level secondary data analysis

Author

Shewade, Hemant Deepak, Kiruthika, G., Ravichandran, Prabhadevi, Iyer, Swati, Chowdhury, Aniket, Kiran Pradeep, S., Jeyashree, Kathiresan, Devika, S., Chadwick, Joshua, Wesley Vivian, Jeromie, Tumu, Dheeraj, Shah, Amar N., Vadera, Bhavin, Roddawar, Venkatesh, Mattoo, Sanjay K., Rade, Kiran, Rao, Raghuram, and Murhekar, Manoj V.

Abstract

ABSTRACTBackgroundIndia has been implementing active case-finding (ACF) for TB among marginalised and vulnerable (high-risk) populations since 2017. The effectiveness of ACF cycle(s) is dependent on the use of appropriate screening and diagnostic tools and meeting quality indicators.ObjectivesTo determine the number of ACF cycles implemented in 2021 at national, state (n = 36) and district (n = 768) level and quality indicators for the first ACF cycle.MethodsIn this descriptive study, aggregate TB program data for each ACF activity that was extracted was further aggregated against each ACF cycle at the district level in 2021. One ACF cycle was the period identified to cover all the high-risk populations in the district. Three TB ACF quality indicators were calculated: percentage population screened (≥10%), percentage tested among screened (≥4.8%) and percentage diagnosed among tested (≥5%). We also calculated the number needed to screen (NNS) for diagnosing one person with TB (≤1538).ResultsOf 768 TB districts, ACF data for 111 were not available. Of the remaining 657 districts, 642 (98%) implemented one, and 15 implemented two to three ACF cycles. None of the districts or states met all three TB ACF quality indicators’ cut-offs. At the national level, for the first ACF cycle, 9.3% of the population were screened, 1% of the screened were tested and 3.7% of the tested were diagnosed. The NNS was 2824: acceptable (≤1538) in institutional facilities and poor for population-based groups. Data were not consistently available to calculate the percentage of i) high-risk population covered, ii) presumptive TB among screened and iii) tested among presumptive.ConclusionIn 2021, India implemented one ACF cycle with sub-optimal ACF quality indicators. Reducing the losses between screening and testing, improving data quality and sensitising stakeholders regarding the importance of meeting all ACF quality indicators are recommended.

Published
2023
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248. Laparoscopic assisted removal of large ovarian mass causing precocious puberty in an infant—a case report

Author

Shah, Amar, Lahmar, Abdelilah, Momin, Elina, Momin, Shabbir, and Shah, Anirudh

Abstract

Background : Sex cord and stromal tumors are a heterogeneous group of tumors that arise from gonadal sex cord cells, gonadal stromal cells, or both. They are divided into pure stromal tumors, pure sex cord tumors, and mixed tumors. Some of these tumors are hormonally active, producing androgens and estrogens, and may therefore exhibit virilization or excess estrogen. Sertoli-Leydig cell tumors are rare tumors belonging to mixed tumors representing less than 0.5% of ovarian tumors. Few cases have been reported in the medical literature. Case presentation: We report the case of a 1-year-old girl who was admitted for breast lumps and pubic hair with intermittent painless vaginal bleeding in the past 2 weeks. The abdominal examination objectified the presence of an intraperitoneal mass to which an abdominal ultrasound and computerized tomography (CT) scan had confirmed the presence of a right ovarian mass. A laparoscopy was performed which showed an encapsulated mass arriving from the right ovary replacing the normal ovarian tissue. Laparoscopic-assisted removal of the entire mass was done. The postoperative course was uneventful. The histopathological study demonstrated an intermediately differentiated Sertoli cell tumor with an intact capsule, no lymphovascular invasion, or heterologous elements (TNM stage 1). Conclusions: Although Sertoli-Leydig tumors are commonly seen after the second decade of life in young women, their discovery before puberty is not uncommon. Mass syndrome and signs of virilization are two frequently reported signs that should prompt the clinician to mention this entity among the differential diagnoses. The first-line radiological examination is pelvic ultrasound. The treatment is mainly based on surgery. The prognosis is excellent especially if the tumor is well differentiated.

Published
2023
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