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How to weigh the current evidence for clinical practice.
1Royal United Hospital Bath NHS Trust, Combe Park, Bath BA1 3NG, UK. andrew.padkin@ruh.nhs.uk
Best Practice & Research. Clinical Anaesthesiology
|January 30, 2010
Summary
This guide helps evaluate studies on tight glucose control in critically ill patients. It outlines how to assess trial validity and generalizability for better clinical decision-making.
Area of Science:
- Critical Care Medicine
- Clinical Trials Methodology
- Endocrinology
Background:
- Tight glucose control in critically ill patients remains a complex area with conflicting trial results.
- Assessing the quality and applicability of these trials is crucial for evidence-based practice.
- Previous reviews have not provided a structured approach to evaluating such studies.
Purpose of the Study:
- To present a comprehensive template for judging the internal validity and generalizability of randomized controlled trials (RCTs) investigating tight glucose control in critically ill patients.
- To highlight common and specific threats to validity and generalizability within this field.
- To provide a framework for critical appraisal of existing and future research.
Main Methods:
- Review of threats to internal validity applicable to all RCTs (e.g., allocation concealment, blinding, losses to follow-up, protocol adherence).
- Identification of specific threats to internal validity in glucose control trials (e.g., methods of glucose monitoring, control algorithms, reporting standards).
- Analysis of factors affecting generalizability, including differences in patient populations, clinical settings, and intervention delivery.
Main Results:
- Internal validity assessment requires scrutiny of both general RCT principles and glucose control-specific methodologies.
- Generalizability is compromised by discrepancies between trial populations/settings and the intended patient population.
- The impact of identified differences on the intervention's effect must be carefully evaluated.
Conclusions:
- A systematic approach is needed to critically appraise trials of tight glucose control.
- Understanding threats to validity and generalizability enhances the reliable application of research findings.
- This template aids clinicians and researchers in making informed judgments about the evidence for tight glucose control.
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