Publications by authors named "Raman Gowri"

The Patient-Centered Outcomes Research Institute (PCORI) is a nonprofit, nongovernmental organization established by the U.S. Congress to fund comparative clinical effectiveness research focusing on patient-centered outcomes through the engagement of stakeholders.

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Objective: To assess whether the Prediction model Risk Of Bias ASsessment Tool (PROBAST) and a shorter version of this tool can identify clinical prediction models (CPMs) that perform poorly at external validation.

Study Design And Setting: We evaluated risk of bias (ROB) on 102 CPMs from the Tufts CPM Registry, comparing PROBAST to a short form consisting of six PROBAST items anticipated to best identify high ROB. We then applied the short form to all CPMs in the Registry with at least 1 validation (n=556) and assessed the change in discrimination (dAUC) in external validation cohorts (n=1,147).

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Article Synopsis
  • Proper planning and reporting of statistical methods are essential for research quality and transparency.
  • The paper outlines best practices for creating a statistical analysis plan before starting research, performing analysis, and reporting results specifically for human nutrition randomized controlled trials (RCTs).
  • For comprehensive guidance on conducting human nutrition RCTs, readers are directed to additional publications in the NURISH series.
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Background: Owing to their resistance to an important class of antibiotics, the prevention and treatment of carbapenem-resistant (CR)/non-susceptible Gram-negative (GN) infections has become an important public health objective. We conducted a systematic review and meta-analysis of published literature to evaluate the burden of CR GN infections, focusing on high-risk patients such as transplant recipients, or patients with cancer, renal impairment, or sepsis.

Methods: MEDLINE®, Cochrane Central, and Embase® were searched between 2010 and March 2019.

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Background: Recent systematic review of clinical trials concluded that there was no convincing evidence to suggest an association between potatoes and risk of cardio-metabolic diseases.

Objective: Summarize observational study data related to potato intake and cardio-metabolic health outcomes in adults using evidence mapping to assess the need for a future systematic review.

Methods: We searched MEDLINE®, Commonwealth Agricultural Bureau, and bibliographies for eligible observational studies published between 1946 and July 2020.

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Article Synopsis
  • Proper planning and execution of clinical data collection are crucial for obtaining reliable results in human nutrition randomized controlled trials (RCTs).
  • The article outlines best practices for biospecimen collection, clinical data management, and processes like data entry, cleaning, and database locking.
  • Additional resources are provided to help improve the quality of data, ultimately supporting better food and nutrition policies.
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Background: Recent evidence suggests that there is often substantial variation in the benefits and harms across a trial population. We aimed to identify regression modeling approaches that assess heterogeneity of treatment effect within a randomized clinical trial.

Methods: We performed a literature review using a broad search strategy, complemented by suggestions of a technical expert panel.

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Strenuous muscular workouts can increase markers of inflammation that can potentially damage components of skeletal muscles. Blueberries contain a variety of nutrients and phytochemicals that have individually been related to reduction in oxidative stress and inflammation. The objective was to conduct a systematic overview using evidence mapping to identify research-dense and evidence gap areas that examine the impact of blueberry consumption on exercise performance and inflammatory markers in adults.

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Objectives: To conduct a systematic review and meta-analysis on data related to macular pigment optical density (MPOD) and visual function in adults with healthy eyes.

Methods: MEDLINE®, Cochrane, and Commonwealth of Agriculture Bureau abstracts databases were searched for English-language publications between 1946 and August 2018. Included studies examined correlation of MPOD and visual function in adults with healthy eyes at all timepoints and all designs, except for case-control, case reports, and reviews.

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Background: Treatment of resistant Pseudomonas aeruginosa infection continues to be a challenge in Latin American countries (LATAM). We synthesize the literature on the use of appropriate initial antibiotic therapy (AIAT) and inappropriate initial antibiotic therapy (IIAT) in P. aeruginosa infections, and the literature on risk factors for acquisition of resistant P.

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Heterogeneity of treatment effect (HTE) refers to the nonrandom variation in the magnitude or direction of a treatment effect across levels of a covariate, as measured on a selected scale, against a clinical outcome. In randomized controlled trials (RCTs), HTE is typically examined through a subgroup analysis that contrasts effects in groups of patients defined "1 variable at a time" (for example, male vs. female or old vs.

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The PATH (Predictive Approaches to Treatment effect Heterogeneity) Statement was developed to promote the conduct of, and provide guidance for, predictive analyses of heterogeneity of treatment effects (HTE) in clinical trials. The goal of predictive HTE analysis is to provide patient-centered estimates of outcome risk with versus without the intervention, taking into account all relevant patient attributes simultaneously, to support more personalized clinical decision making than can be made on the basis of only an overall average treatment effect. The authors distinguished 2 categories of predictive HTE approaches (a "risk-modeling" and an "effect-modeling" approach) and developed 4 sets of guidance statements: criteria to determine when risk-modeling approaches are likely to identify clinically meaningful HTE, methodological aspects of risk-modeling methods, considerations for translation to clinical practice, and considerations and caveats in the use of effect-modeling approaches.

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Apples and pears contain nutrients that have been linked to cardiovascular health. We conducted a systematic review and meta-analysis to summarize related research. Medline, Cochrane Central, and Commonwealth Agricultural Bureau databases were searched for publications on apple or pear intake and cardiovascular disease (CVD)/ cardiometabolic disease (CMD).

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Background: Although available data suggest that some dietary flavan-3-ol sources reduce cardiometabolic risk, to our knowledge no review has systematically synthesized their specific contribution.

Objective: We aimed to examine, for the first time, if there is consistent evidence that higher flavan-3-ol intake, irrespective of dietary source, reduces cardiometabolic risk.

Methods: MEDLINE, Cochrane Central, and Commonwealth Agricultural Bureau abstracts were searched for prospective cohorts and randomized controlled trials (RCTs) published from 1946 to March 2019 on flavan-3-ol intake and cardiovascular disease (CVD) risk.

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Evidence suggests that eating nuts may reduce the risk of cardiovascular disease (CVD). We conducted a systematic review and meta-analysis of randomized controlled trials (RCTs) evaluating almond consumption and risk factors for CVD. MEDLINE, Cochrane Central, Commonwealth Agricultural Bureau, and previous systematic reviews were searched from 1990 through June 2017 for RCTs of ≥3 wk duration that evaluated almond compared with no almond consumption in adults who were either healthy or at risk for CVD.

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Hyponatremia decreases bone mineral density and is a major risk factor for fragility fractures. Objectives of our systematic review and meta-analysis were to analyze the overall effects of hyponatremia on bone fractures, osteoporosis, and mortality. We extracted data from Medline, Cochrane Central, and EMBASE 1960-2017 and conference abstracts from 2007-2017.

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Article Synopsis
  • This study investigates how increased intake of flavan-3-ols, found in foods like cocoa and tea, affects cardiovascular disease (CVD) and diabetes outcomes.
  • A thorough methodological approach was taken, including forming an expert panel, systematically searching and analyzing relevant studies, with a focus on randomized controlled trials (RCTs) and cohort studies.
  • Out of 257 articles reviewed, 226 RCTs mostly focused on cocoa-based products and berries, measuring various health outcomes such as blood glucose, serum lipid levels, and blood pressure, indicating a significant amount of data on the relationship between flavan-3-ol intake and CVD.
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Background: Identifying risk factors predicting acquisition of resistant will aid surveillance and diagnostic initiatives and can be crucial in early and appropriate antibiotic therapy. We conducted a systematic review examining risk factors of acquisition of resistant among hospitalized patients.

Methods: MEDLINE®, EMBASE®, and Cochrane Central were searched between 2000 and 2016 for studies examining independent risk factors associated with acquisition of resistant , among hospitalized patients.

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Objective: Individual patients with the same condition may respond differently to similar treatments. Our aim is to summarise the reporting of person-level heterogeneity of treatment effects (HTE) in multiperson N-of-1 studies and to examine the evidence for person-level HTE through reanalysis.

Study Design: Systematic review and reanalysis of multiperson N-of-1 studies.

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Background: Nutrients in avocados are associated with cardiovascular benefits.

Objective: The aim of this study was to determine the effect of avocado intake on cardiovascular disease (CVD) risk with the use of a systematic review and meta-analysis.

Design: MEDLINE, Cochrane Central, and Commonwealth Agricultural Bureau abstracts were searched from 1946 through September 2017 for publications on avocado intake and CVD risk.

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Background: Clinical predictive models (CPMs) estimate the probability of clinical outcomes and hold the potential to improve decision-making and individualize care. The Tufts Predictive Analytics and Comparative Effectiveness (PACE) CPM Registry is a comprehensive database of cardiovascular disease (CVD) CPMs. The Registry was last updated in 2012, and there continues to be substantial growth in the number of available CPMs.

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Background: Atherosclerotic renal artery stenosis (ARAS) is associated with high blood pressure (BP), decreased kidney function, renal replacement therapy (RRT), and death.

Purpose: To compare benefits and harms of percutaneous transluminal renal angioplasty with stent placement (PTRAS) versus medical therapy alone in adults with ARAS.

Data Sources: MEDLINE, EMBASE, and Cochrane Central Register of Controlled Trials from 1993 to 16 March 2016; gray literature; and prior systematic reviews.

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