Research, Evidence-Based Practice, and Quality Improvement
Core concepts
This domain tests how nurses use evidence to improve care. Understand the research process: problem identification, literature review, hypothesis, design, data collection, analysis, and dissemination. Distinguish quantitative from qualitative designs, and experimental from observational studies. Know levels of evidence, with systematic reviews and randomized controlled trials ranked high. Evidence-based practice integrates best evidence, clinical expertise, and patient values. Quality improvement uses models such as Plan-Do-Study-Act and tools like root cause analysis. Understand reliability versus validity, and basic statistics such as mean and standard deviation. Ethical conduct in research includes informed consent and institutional review board approval.
Traps to watch
A common trap is equating a single study with practice change; evidence must be appraised and synthesized. Another is confusing reliability (consistency) with validity (accuracy). Questions may test that quality improvement focuses on systems and processes, not individual blame. Watch for items about research ethics, such as protecting vulnerable populations. Do not confuse correlation with causation.
Worked rule of thumb
When asked to choose the best evidence, rank by design strength: systematic review or meta-analysis first, then randomized controlled trials, then cohort, then case reports. Example: to answer a clinical question, prefer a systematic review over a single small study.