EBM papers

Introduction to Clinical Epidemiology and Statistics

  • Overview of key concepts needed to understand clinical research and MRCOG examination terms.

  • Shift from traditional medical practice to Evidence-Based Medicine (EBM) as defined by Gordon Guyatt in the early 1990s.

  • EBM emphasizes critical appraisal of research to inform clinical decisions.

  • Identifying randomized controlled trials (RCTs) as the best method to establish treatment effectiveness.

Evidence-Based Medicine (EBM) Development

  • Effective Care in Pregnancy and Childbirth: First systematic review in medicine summarizing treatment effects.

  • Establishment of the Cochrane Collaboration in 1993 for systematic reviews.

  • EBM evolving to consider patient values alongside best evidence.

Steps of Evidence-Based Medicine Practice

  1. Defining a Clinical Question

    • Importance of precise, answerable questions.

    • Introduction of the PICO framework:

      • P - Population: demographics of patients.

      • I - Intervention: main actions taken (treatments, tests).

      • C - Comparison group: alternative treatments or placebo.

      • O - Outcome: expected changes in health.

  2. Finding the Best Evidence

    • Utilization of databases for comprehensive literature searches.

    • Key databases: MEDLINE, EMBASE, Cochrane Library, and others for systematic reviews and guidelines.

  3. Appraising the Evidence

    • Evaluate quality and applicability of studies (systematic reviews preferred).

    • Understanding biases (selection, performance, detection, attrition, reporting).

    • Assessing internal and external validity:

      • Internal validity: minimized bias in study.

      • External validity: generalizability to other clinical contexts.

  4. Integrating the Evidence

    • Application of evidence in clinical practice and guidelines.

    • Utilization of GRADE for grading evidence quality.

  5. Reviewing or Auditing Clinical Practices

    • Distinction between research (discovering what to do) and audit (ensuring it is done).

    • Importance of structuring clinical audits and measuring care against standards.

Important Considerations in Clinical Research

  • Auditable Standards: Criteria for assessing clinical practices.

  • Types of Studies: Different methods for specific clinical questions (RCTs for treatments, cohort studies for prognoses).

  • Data Collection and Analysis: Guidelines for ethical data usage, including data protection regulations and consent requirements.

  • Quality Improvement: Strategies to implement change based on audit findings for better clinical outcomes.

Glossary of Terms in Clinical Epidemiology

  • Definitions:

    • Cohort Study: Follows two groups over time to observe outcomes.

    • Case–Control Study: Compares exposure history of cases vs. controls.

    • RCT: Randomly assigns subjects to treatment or control groups.

  • Key metrics:

    • Mean, Median, Range: Statistical measures.

    • Absolute Risk Reduction: Difference between control and experimental event rates.

    • Number Needed to Treat (NNT): Number of patients needed to treat to prevent one adverse outcome.

Key References and Resources

  • Importance of critical appraisal and systematic reviews in guiding clinical practice.

  • Notable references to foundational texts and emerging guidelines in EBM.