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Related Experiment Videos

Does placebo lower blood-pressure?

B A Gould, S Mann, A B Davies

    Lancet (London, England)
    |December 19, 1981
    PubMed
    Summary
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    Placebo effects on blood pressure are an artifact of clinic measurements, not true physiological changes. This highlights potential underestimation of drug efficacy in hypertension trials.

    Area of Science:

    • Cardiology
    • Clinical Pharmacology
    • Hypertension Research

    Background:

    • The placebo effect can influence physiological measurements in clinical trials.
    • Accurate assessment of blood pressure is crucial for evaluating antihypertensive drug efficacy.

    Purpose of the Study:

    • To investigate the discrepancy between clinic and ambulatory blood pressure measurements during placebo administration.
    • To determine if the placebo response in hypertension trials is a measurement artifact.

    Main Methods:

    • A double-blind, randomized controlled trial involving 20 hypertensive patients treated with indoramin.
    • Blood pressure was measured using standard sphygmomanometry and ambulatory intra-arterial monitoring.
    • Comparison of blood pressure changes during placebo and indoramin treatment phases.

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    Main Results:

    • Clinic sphygmomanometry showed significant blood pressure reduction during placebo, while ambulatory monitoring showed no significant effect.
    • Indoramin treatment resulted in greater blood pressure reduction measured by ambulatory monitoring (18/13 mm Hg) compared to clinic measurements (6/8 mm Hg).
    • The observed placebo response was attributed to measurement artifacts in the clinic setting.

    Conclusions:

    • Clinic blood pressure measurement can create an artificial placebo effect in hypertension studies.
    • Relying solely on clinic measurements may lead to underestimation of the true efficacy of antihypertensive drugs.
    • Ambulatory blood pressure monitoring provides a more accurate assessment of drug effects and placebo responses.