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Evidence Based Practice

Research, evidence-based practice, and clinical decision making.

Evidence Based Practice in Nursing

Evidence based practice (EBP) means integrating the best available research evidence with clinical expertise and patient preferences when making decisions about care. It is a fundamental principle of modern nursing.

The Three Elements of EBP

  1. Best research evidence — Findings from high-quality research studies
  2. Clinical expertise — The nurse's own experience, skills, and knowledge
  3. Patient values and preferences — What matters to the individual patient

Research Types

  • Quantitative research — Numerical data, statistics, measuring outcomes (e.g. randomised controlled trials)
  • Qualitative research — Experiences, perceptions, meanings (e.g. interviews, focus groups)
  • Mixed methods — Combining both quantitative and qualitative approaches
  • Systematic reviews — Comprehensive review of all available evidence on a topic
  • Meta-analysis — Statistical combination of results from multiple studies

The Hierarchy of Evidence

Not all evidence is equal. The hierarchy of evidence (from strongest to weakest):

  1. Systematic reviews and meta-analyses
  2. Randomised controlled trials (RCTs)
  3. Cohort studies
  4. Case-control studies
  5. Cross-sectional studies
  6. Case series and case reports
  7. Expert opinion
  8. Anecdotal evidence

Critical Appraisal

Critical appraisal involves evaluating research to determine its validity, reliability, and applicability. Key questions include:

  • Was the study design appropriate?
  • Was the sample size adequate?
  • Were confounding factors controlled?
  • Are the results clinically significant?
  • Can the results be applied to my patient population?

Implementing EBP

The process of implementing evidence based practice involves:

  1. Asking a clinical question using PICO (Population, Intervention, Comparison, Outcome)
  2. Searching for evidence
  3. Critically appraising the evidence
  4. Implementing changes in practice
  5. Evaluating the outcomes

Clinical Guidelines

Evidence based guidelines (e.g. from NICE, the National Institute for Health and Care Excellence) translate research findings into practical recommendations. Nurses should follow evidence based guidelines but also use clinical judgement to adapt them to individual patient circumstances.