CHS CHS Research & Evidence-Based Practice 2 — Questions and Answers
Question 1: In clinical research terminology, what is 'publication bias' and why is it relevant to hypertension research?
- The tendency for positive studies to be published more than negative ones, potentially overestimating treatment benefits (Correct answer)
- The preference for publishing case reports over RCTs
- The practice of publishing only US-based research
- The delay in publishing industry-funded trials
Correct answer: The tendency for positive studies to be published more than negative ones, potentially overestimating treatment benefits
Publication bias occurs when studies showing favorable results are more likely to be published, which can overestimate the true effectiveness of antihypertensive interventions in literature.
Question 2: When applying evidence-based guidelines to an individual hypertensive patient, what is the most critical additional step beyond applying the guideline recommendation?
- Incorporating the patient's values, preferences, and clinical context into the treatment decision (Correct answer)
- Following the guideline without modification regardless of patient factors
- Defaulting to the oldest published evidence only
- Using only the most expensive available treatment
Correct answer: Incorporating the patient's values, preferences, and clinical context into the treatment decision
Evidence-based practice requires integrating research evidence with clinical expertise and individual patient values and circumstances for optimal decision-making.
Question 3: What does an 'intention-to-treat' (ITT) analysis in a hypertension RCT ensure?
- All randomized patients are analyzed in their original groups regardless of adherence or dropout (Correct answer)
- Only patients who completed the study are analyzed
- Only the most adherent patients contribute data
- Patients are reassigned based on actual treatment received
Correct answer: All randomized patients are analyzed in their original groups regardless of adherence or dropout
ITT analysis preserves the benefits of randomization and provides a conservative, real-world estimate of treatment effectiveness by including all randomized participants.
Question 4: The ACCORD BP trial, conducted in diabetic patients, found what regarding intensive blood pressure control to systolic <120 mmHg?
- It reduced stroke risk but did not significantly reduce major cardiovascular events compared to standard control (Correct answer)
- It dramatically reduced all cardiovascular outcomes
- It increased mortality in diabetic patients
- It had no effect on any outcomes in diabetes
Correct answer: It reduced stroke risk but did not significantly reduce major cardiovascular events compared to standard control
ACCORD BP found that intensive SBP control (<120 mmHg) reduced stroke risk in diabetic patients but did not significantly reduce the primary composite cardiovascular endpoint vs standard control (<140 mmHg).
Question 5: When critically appraising a hypertension study, what does 'internal validity' primarily refer to?
- The degree to which the study accurately measures cause and effect within the study population (Correct answer)
- How well the results apply to patients outside the study
- The statistical significance of the findings
- The quality of the journal in which the study is published
Correct answer: The degree to which the study accurately measures cause and effect within the study population
Internal validity refers to how accurately a study demonstrates a causal relationship between intervention and outcome within its own study population, free from bias and confounding.
Question 6: Which outcome is considered the gold standard 'hard endpoint' in hypertension clinical trials?
- Major adverse cardiovascular events (MACE), including MI, stroke, and cardiovascular death (Correct answer)
- Achieving a target blood pressure reading
- Reduction in antihypertensive pill burden
- Patient-reported satisfaction scores
Correct answer: Major adverse cardiovascular events (MACE), including MI, stroke, and cardiovascular death
MACE endpoints—comprising myocardial infarction, stroke, and cardiovascular death—are considered hard clinical endpoints because they directly measure the most critical consequences of uncontrolled hypertension.
CHS CHS Research & Evidence-Based Practice 2
In clinical research terminology, what is 'publication bias' and why is it relevant to hypertension research?