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Propranolol effects on autonomic function in hypertensive men

D T O'Connor, R A Preston

    Clinical Cardiology
    |May 1, 1982
    PubMed
    Summary
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    Beta blockers like propranolol lower blood pressure and heart rate in hypertensive men. However, these effects on autonomic function do not directly correlate with reduced sympathetic nervous system activity.

    Area of Science:

    • Cardiology
    • Autonomic Neuroscience
    • Pharmacology

    Background:

    • The precise mechanisms underlying the antihypertensive effects of beta blockers remain incompletely understood.
    • Alterations in autonomic nervous system function are a potential contributing factor to beta blocker efficacy.

    Purpose of the Study:

    • To investigate the impact of chronic oral propranolol treatment on autonomic function in men with essential hypertension.
    • To determine if changes in autonomic function correlate with the blood pressure-lowering effects of propranolol.

    Main Methods:

    • A randomized, placebo-controlled study involving 12 men with essential hypertension.
    • Assessment of autonomic function using phenylephrine and amyl nitrite testing for baroreflex sensitivity.
    • Evaluation of sympathetic nervous system activity through response to cold pressor test, phentolamine blockade, and biochemical markers.

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    Main Results:

    • Propranolol significantly reduced blood pressure and heart rate (p < 0.01).
    • Baroreflex sensitivity increased during phenylephrine testing (p < 0.02) but was unchanged with amyl nitrite.
    • No significant correlation was observed between blood pressure reduction and baroreflex enhancement.
    • Propranolol did not alter responses to the cold pressor test or phentolamine, nor did it influence biochemical indices of sympathetic activity.

    Conclusions:

    • Chronic propranolol administration perturbs autonomic function in hypertensive individuals.
    • The observed alterations in autonomic function do not directly correlate with the antihypertensive effects of propranolol.
    • Propranolol does not appear to reduce efferent sympathetic activity based on the physiological and biochemical measures used.