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Related Experiment Videos

Long-term clonidine effects on autonomic function in essential hypertensive man

I M Cohen, D T O'Connor, R A Preston

    European Journal of Clinical Pharmacology
    |January 1, 1981
    PubMed
    Summary

    Long-term low-dose clonidine effectively lowers blood pressure in men with essential hypertension. However, this study found it does not enhance baroreflex sensitivity or suppress sympathetic outflow, suggesting other mechanisms are at play.

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    Area of Science:

    • Cardiovascular Physiology
    • Pharmacology
    • Hypertension Research

    Background:

    • Acute clonidine use lowers blood pressure via central baroreflex enhancement and reduced sympathetic outflow.
    • Long-term effects and mechanisms of low-dose clonidine in hypertension remain inconclusive.

    Purpose of the Study:

    • To investigate the effects of one-month low-dose clonidine on blood pressure and sympathetic function in hypertensive men.
    • To assess clonidine's impact on baroreflex sensitivity, sympathetic biochemical markers, and vascular tone.

    Main Methods:

    • 13 essential hypertensive men received low-dose clonidine (0.4 mg/day) for one month.
    • Evaluated blood pressure, urinary catecholamines, metanephrines, vanillylmandelic acid, baroreflex sensitivity (amylnitrite/phenylephrine tests), cold pressor test, and response to alpha-adrenergic blockade (phentolamine).

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    Main Results:

    • Clonidine significantly reduced mean arterial pressure (104 to 84 mmHg).
    • No significant changes were observed in sympathetic outflow biochemical markers or baroreflex sensitivity.
    • Increased alpha-adrenergic vascular tone was suggested by an enhanced pressor response to phentolamine.

    Conclusions:

    • The antihypertensive mechanism of long-term, low-dose clonidine is not attributable to baroreflex enhancement or sympathetic outflow suppression.
    • Clonidine may increase alpha-adrenergic vascular tone, contributing to its blood pressure-lowering effect.