Clinical Questions and Evidence Retrieval
PECO(t), question types, evidence sources and hierarchies, publication and language bias, indexing, databases and efficient retrieval.
How to prepare for MRCPsych Paper B
Integrate clinical formulation, safety and current UK practice with disciplined appraisal of design, bias, estimates and applicability.
Core concepts
Concept 1
An answerable question specifies the patient or problem, exposure or intervention, comparator, outcome and relevant time, adapted to therapy, diagnosis, prognosis, harm, economics or qualitative inquiry.
Exam cue: Translate the clinical uncertainty into PECO(t) before choosing a design or searching.
Concept 2
Efficient retrieval combines appropriate sources, controlled vocabulary and free text, Boolean logic, limits and a reproducible search while recognising publication and language bias.
Exam cue: Select the source and search strategy that balance sensitivity, precision, time and the type of evidence needed.
Risk pitfalls and guardrails
Searching a broad topic without a defined comparator or outcome and then selecting convenient evidence.
Guardrail: Do not choose an option because it is merely familiar or associated; show why it best answers this lead-in.
Treating the evidence hierarchy as absolute regardless of the question being asked.
Guardrail: Do not choose an option because it is merely familiar or associated; show why it best answers this lead-in.
Memory anchors
What does PECO(t) stand for?
Patient or population, exposure or intervention, comparator, outcome and time.
How do sensitivity and precision differ in searching?
A sensitive search retrieves more relevant records but also more noise; a precise search returns a higher proportion of relevant records.
What does OR do in a database search?
It combines synonyms or alternatives and broadens retrieval.
What does AND do in a database search?
It requires both concepts and usually narrows retrieval.
What is publication bias?
Studies are more likely to be published, or published promptly, because of the direction or significance of their findings.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
A psychiatrist asks whether adding family intervention to usual care reduces relapse over 12 months in adults with first-episode psychosis. Which element is the comparator?
A team wants to know whether baseline social isolation predicts dementia over ten years. What type of clinical question is this?
Answer all questions to submit.
Next step personalized recommendations
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Move forward only after this module is stable.
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