Rajvir Singh

Rajvir Singh
Hamad Medical Corporation | HMC · Department of Surgery (Hamad General Hospital)

Ph.D.

About

568
Publications
96,669
Reads
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8,772
Citations
Citations since 2017
159 Research Items
4623 Citations
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201720182019202020212022202302004006008001,000
201720182019202020212022202302004006008001,000
Additional affiliations
January 2012 - March 2022
Hamad Medical Corporation
Position
  • Principal Academic & Research Scientist
January 2010 - December 2011
December 2006 - present
Hamad Medical Corporation
Position
  • Sr. consultant (Bio-statistics)
Education
July 1997 - December 2002
All India Institute of Medical Sciences
Field of study
  • Biostatistics

Publications

Publications (568)
Article
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Background The lethal potential of COVID-19 was often emphasized and repeatedly brought to the attention of pregnant women, leading to a higher level of anxiety, depression, and COVID-19-specific phobia among this population. Furthermore, legislation forced social distancing and isolation to interrupt the infection cycle. Together these factors res...
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Aims and Objective Anti-seizure drugs that cause idiosyncratic drug-induced liver injury (DILI) are an important cause of morbidity and mortality in individuals exposed to these drugs. The clinical and demographic characteristics, the liver injury pattern, the outcome, and the agents responsible for hepatotoxicity have not been thoroughly studied....
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Introduction: Colorectal cancer is one of the most common cancers globally. Recent reductions in mortality rates have been primarily attributed to screening programs. The State of Qatar established a national bowel cancer screening program in 2016. Methodology: Fecal immunochemical testing (FIT) was used for average-risk individuals aged 50 to 74 y...
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Background Chest radiographs are frequently used to evaluate pediatric patients with COVID-19 infection during the current pandemic. Despite the minimal radiation dose associated with chest radiography, children are far more sensitive to ionizing radiation's carcinogenic effects than adults. This study aimed to examine whether serum biochemical mar...
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Background: Antibiotics act as a therapeutic weapon in eradicating pathogens. Antibiotics are the most common group of drugs misused for self-medication. This is a global public health concern and is one of the major contributing factors to antibiotic resistance (ABR). Objective: This study aimed to assess the knowledge and beliefs of the public in...
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The COVID-19 pandemic involved the globe and resulted in major mortalities mainly affecting the respiratory system. Initially thought to be respiratory disease it was later postulated and confirmed the involvement of gastro-intestinal tract (GIT) and its contribution to the complications and mortalities. Herein we present five cases of severe COVID...
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Background: Cardiac arrests in admitted hospital patients with trauma have not been described in the literature. We defined "in-hospital cardiac arrest of a trauma" (IHCAT) patient as "cessation of circulatory activity in a trauma patient confirmed by the absence of signs of circulation or abnormal cardiac arrest rhythm inside a hospital setting,...
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Background: Autoimmune rheumatic diseases (ARDs) are characterized by immune dysfunction and associated with an increased risk of infections, which were of significant concern during the coronavirus disease 2019 (COVID-19) pandemic. Variable rates of COVID-19 incidence have been reported in patients with ARDs; however, the true effect of this infe...
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A public healthcare system is one in which the government governs and controls all healthcare services. It offers high-quality medical care to all citizens, regardless of their ability to pay. The benefits of public healthcare against the private healthcare system showed that the former reduces overall healthcare and administrative costs. It helps...
Article
Introduction: Immunoallergic drug-induced liver injury (DILI) presenting with features of drug reaction with eosinophilia and systemic symptoms (DRESS) is a distinct phenotype. We describe the clinical characteristics, hepatitis pattern, severity, complications, and the implicated medications in DILI patients with and without DRESS. Methods: Usi...
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Background/objective Acute appendicitis (AA) is one of the most common surgical emergencies that require a proper diagnosis to avoid a negative outcome in the case of missed or delayed diagnosis. Our study aims to assess the diagnostic power of the Alvarado score and the prediction of the severity of acute appendicitis in correlation to intraoperat...
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Background and purpose Understanding the relationship of COVID-19 to stroke is important. We compare characteristics of pre-pandemic historical stroke (Pre-C), cases in acute COVID infection (Active-C) and in patients who have recovered from COVID-19 infection (Post-C). Methods We interrogated the Qatar stroke database for all stroke admissions be...
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Student perspectives on their final year clinical placements in biomedical sciences at Qatar University are assessed using the clinical practicum assessment tool (CPAT), which was developed in-house following accreditation body requirements. The tool, which we call the CPAT-Qatar University (CPAT-QU), covers the three clinical practicum domains: pr...
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Understanding the relationship of COVID-19 to stroke is important. We compare characteristics of pre-pandemic stroke (PPS), cases in acute COVID infection (CS) and in patients who have recovered from COVID-19 infection (RCS). We interrogated the Qatar stroke database for all stroke admissions between Jan 2020 and Feb 2021 (PPS) to CS and RCS to det...
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Aim: To evaluate if in patients with known diabetes, pretreatment metformin will lead to less severe stroke, better outcome, and lower mortality following acute stroke. Methods: The Qatar stroke database was interrogated for stroke severity and outcome in patients with ischemic stroke. Outcome was compared in nondiabetic vs. diabetic patients an...
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Background COVID-19 pandemic has affected all dimensions of day to day life across the world and medical education was no exception. With this study, we aimed to understand the effect of nationwide restrictions on medical education in Qatar, the models of education adopted during this period and perceptions of participants to the same. Methods We...
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We describe the process of implementation, adaptation, expansion and some related clinical intuitional impacts of the neonatal simulation program since its launch in 2016 in a non-simulation neonatal unit. The team has developed 6 types of curricula: 1 full-day course and 5 half-day workshops. A total of 35 free of charge simulation courses/worksho...
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Background: Family consent and organ donors rates are co-linear to each other. The low consent rate can be influenced by socioeconomic and behavioral factors in the population. This study aimed to assess the influence of sociodemographic and behavioral factors on family consent for organ donation in the household population. Subjects dan Method: Th...
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Background: Prompt recognition and reporting of Medication Administration Errors (MAE) are paramount in ensuring patient safety in hospitals. The data on under-reporting MAE in Middle East Area is limited. Aim: The study intended to estimate the percentage of fear factor and explore the perception of nursing professionals regarding the reason for t...
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Background: The lack of healthcare quality management poses significant legal and financial implications 1,2 . A proactive approach to systems improvement seems warranted and reasonable. It is not clear if current quality control measures are perceived by patients. The study aims to understand if any correlation exists in this respect in the contex...
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BACKGROUND Coronavirus disease 2019 (COVID-19) caused by the severe acute respiratory syndrome coronavirus 2 virus most commonly presents with respiratory symptoms. While gastrointestinal (GI) manifestations either at presentation or during hospitalization are also common, their impact on clinical outcomes is controversial. Some studies have descri...
Article
Objectives We aim at identifying the changes in venous blood saturation values that associates intra-aortic balloon pump (IABP) in cardiac surgery patients with reduced left ventricular function (LVF). Methods A retrospective observational study was conducted in a cardiothoracic intensive care unit (CTICU) in a tertiary cardiac center over 5 years...
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Background Despite the dominance of Covid-19 in the current situation, MERS-CoV is found infrequently in the Middle East. When coupled with the chest radiographic score, serum biochemical parameters may be utilized to assess serum biochemical changes in individuals with different degrees of MERS-CoV infection and to predict death. The purpose of th...
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Background and Purpose: Nocturnal non-dipping blood pressure and heart rate are associated with an increased risk of cardiovascular disease. The effects of such variance on cerebrovascular disease have not been well studied. Methods: The 24-h ambulatory blood pressure (ABPM) and heart rate were monitored with B-pro in patients with acute stroke wit...
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Objective Pivotal clinical trials revealed good clinical efficiency of ocrelizumab while having a good safety profile in the management of multiple sclerosis (MS). However, real-world data of ocrelizumab in daily clinical practice remain scarce. The aim of this study was to evaluate the preliminary safety profile and effectiveness of ocrelizumab tr...
Article
Background: The vast majority of literature on atrial fibrillation (AF) is based on studies from the developed world that mainly includes Caucasian patients. Data on AF in other ethnicities is very limited. The aim of this hospital-based study is to evaluate the effect of concomitant hypertension (HTN) on the characteristics and outcomes of Middle...
Preprint
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BackgroundCOVID-19 pandemic has affected all dimensions of day to day life across the world and medical education was no exception. In Qatar, two institutions provide undergraduate medical education; Qatar University - College of medicine and Weill Cornell Medical College, Qatar and post graduate medical education is provided by tertiary care publi...
Article
Aim: This study aimed to investigate whether serum biochemical parameters can be used as a surrogate for chest computed tomography (CT) in the diagnosis of COVID-19 in pediatric patients. Materials & methods: We evaluated potential associations between various serum biochemical markers and the COVID-reporting and data system (RADS) pneumonia gra...
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Background and objectives: Several anthropometric measurements have been suggested to identify a potentially difficult airway. We studied thyromental height (TMH) as a predictor of difficult laryngoscopy and difficult intubation. We also compared TMH, ratio of height to thyromental distance (RHTMD), and thyromental distance (TMD) as predictors of...
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Background The association of cardiac wall motion abnormalities (CWMAs) in patients with stroke who have major adverse cardiovascular events (MACE) remains unclear. The purpose of this study was to estimate the 50‐month risk of MACE, including stroke recurrence, acute coronary events, and vascular death in patients with stroke who have CWMAs. Meth...
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Background and Aims: Several factors determine the success of dural puncture. We aimed to assess the association of first puncture success and number of attempts with characteristics of the patient, provider, technique and equipment. Material and Methods: This prospective, observational study was performed in 1647 adult patients undergoing surgery...
Preprint
Objectives: To study the incidence of rhabdomyolysis (RML) after ascending aortic dissection surgery and to correlate with the outcome especially in terms of renal function. The secondary objective was to pinpoint the perioperative risk factors associated with the development of Rhabdomyolysis and adverse renal outcome after Aortic dissection repai...
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Background: Worldwide, limited data are available about young patients (≤40 years) who present with out-of-hospital cardiac arrest (OHCA). We compared demographic characteristics, clinical presentation, and outcome in younger patients (≤40 years) versus older patients (>40 years) with OHCA. Materials and methods: This was a retrospective analysi...
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Introduction As COVID-19 is spreading, new psychological health problems are suspected to be emerging among pregnant women. Higher maternal mental health distress, including perinatal anxiety, depression, and COVID-19-specific phobia, is supposed to be increasing during the pandemic, which impacts pregnant women’s health and their infants and calls...
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Introduction Despite the fact that patients with severe mental illness (SMI) have high rates of smoking and an increased standardised mortality, there is virtually no information about attitudes to smoking bans in mental health units from countries in the Middle East and North Africa region. Aim To assess support for, and attitudes towards, a prop...
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Background The Middle East respiratory syndrome coronavirus (MERS-Cov) continues to be a source of concern due to intermittent outbreaks. Serial chest radiographic changes in MERS-Cov patients were analyzed for various variables that could be compared to the patients’ final outcomes in a cluster of MERS-Cov patients and to identify a predictor of m...
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Background Screening for antenatal depression and its determinants is highly recommended. However, there is no consensus on a standard conceptual framework to approach pregnant women in a primary health care setting. The prevalence of antenatal depression and significant determinants are unknown in Qatar, a gap that we propose to fill. Methods An...
Preprint
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Background: COVID-19 infection continues to be a serious health concern in pediatric patients, associated with substantial morbidity and mortality. An important clinical question is whether laboratory hematologic parameters may act as a surrogate for imaging findings in pediatric COVID-19 pneumonia, in order to reduce exposure to ionizing radiation...
Article
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Background Embolic stroke of undetermined source (ESUS) accounts for up to 25% of strokes. Understanding risk factors associated with ESUS is important in reducing stroke burden worldwide. However, ESUS patients are younger and present with fewer traditional risk factors. Significant global variation in ESUS populations also exists making the clini...
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Purpose First, to investigate the added diagnostic value of chest computed tomography (CT) for evaluating COVID‐19 in symptomatic children by comparing chest CT findings with chest radiographic findings, and second, to identify the imaging signs and patterns on CT associated with COVID‐19 pneumonia in children. Materials and Methods From March 202...
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The aims of this study were to retrospectively assess the profiles of subjects with suicide attempts and self-harm in Doha, Qatar; and whether the available data were complete. We reviewed all the records of fatal and non-fatal suicides together with accidental self-ham cases seen in the major Emergency Department in Doha, over a one-year period. T...
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Purpose: Demand for an organ transplant is surpassing the number of organ donors and hence increasing waiting lists worldwide, compelling many countries to adopt an opt-out consent system for organ donation. Opt-out is used in several European countries and has increased organ registration rate. No study on this subject has been published from the...
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Background: Enteral feeding has various advantages over parenteral feeding in critically ill patients. Acutely ill patients are at risk of developing enteral feeding intolerance. Prokinetic medications improve gastrointestinal mobility and enteral feed migration and absorption. Among the available prokinetic agents, erythromycin is the most potent...
Article
BACKGROUND Left main coronary artery (LMCA) supplies more than 80% of the left ventricle, and significant disease of this artery carries a high mortality unless intervened surgically. However, the influence of coronary artery bypass grafting (CABG) surgery on patients with LMCA disease on morbidity intensive care unit (ICU) outcomes needs to be exp...
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Background: Left main coronary artery (LMCA) supplies more than 80% of the left ventricle, and significant disease of this artery carries a high mortality unless intervened surgically. However, the influence of coronary artery bypass grafting (CABG) surgery on patients with LMCA disease on morbidity intensive care unit (ICU) outcomes needs to be e...
Preprint
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In this work we tried to study the effect of the regular use of potent mouthwash in COVID19 cases, on the premise that it may speedup the recovery, through the repeated reduction of microbial load of the native oral microbiota, and the 2019-nCOV viral load; thus slowing the disease progression and lowering the incidence of superinfections. Through...
Article
Background: Etiology of and outcomes following idiosyncratic drug-induced liver injury (DILI) vary geographically. We conducted a prospective study of DILI in India, from 2013 to 2018 and summarize the causes, clinical features, outcomes and predictors of mortality. Methods: We enrolled patients with DILI using international DILI expert working gro...
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The presence of COVID-19 infection may increase the risk of thrombotic events including ischemic strokes. Whilst a number of recent reports suggest that COVID-19 associated stroke tends to be severe, there is limited data on the effects of COVID-19 in prospective registries. Material and Methods: To determine how COVID-19 infection may affect cereb...
Article
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Background: Cumulative evidence suggests that early identification of anxiety in pregnancy is important, given that antenatal anxiety has been linked to morbid outcomes in expecting mothers and their offspring. However, the burden of antenatal anxiety is not yet known in Qatar. This research aims to measure the prevalence and determinants of gener...
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The prevalence of transmesocolic hernias, a subtype of internal hernias (IHs), is generally low. Its clinical consequences, including strangulation, ischemia and even death, however, necessitate awareness. IHs are classified as congenital or acquired as resulting from surgery, trauma or intraperitoneal inflammation. This is a case of a 37-year-old...
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Aims: Published data on the clinical presentation of peripartum cardiomyopathy (PPCM) are very limited particularly from the Middle East. The aim of this study was to examine the clinical presentation, management, and outcomes of patients with PPCM using data from a large multicentre heart failure (HF) registry from the Middle East. Methods and r...
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Background: We describe a case of a young male with a history of appendectomy one year ago, who developed symptoms of stump appendicitis, and after removing this stump, histopathology showed low grade neoplasm. Summary. Stump appendicitis is an uncommon complication after appendectomy and may lead to serious complications. Management of low-grade...
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Medical advancements over the past decades brought organ transplantation as a definitive therapy for different end-stage organ failure. However, non-availability of organs required for transplantation is a major challenge worldwide. We aimed to determine the knowledge and willingness to donate organs in various populations and settings in the Middl...
Article
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Background Cardiac features diverge in Asians; however, it is not known how these differences relate to embolic stroke of unknown source (ESUS) in Southeast Asian and Eastern Mediterranean regions. Methods and Results A retrospective analysis of prospectively collected acute ischemic stroke data from 2014 to 2018 was performed. Stroke subtypes wer...
Preprint
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Antimicrobial Resistance (AMR) is a major global concern, negatively impacting public health outcomes (1-5), patient safety (3,6-8) and poses enormous burden on economic development and security (8-16). Internationally, data suggests, at any given time, approximately one-third of the hospitalized patients and over two-thirds of critically ill patie...