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Baroreflex function in elderly hypertensives.

K McGarry, M Laher, D Fitzgerald

    Hypertension (Dallas, Tex. : 1979)
    |September 1, 1983
    PubMed
    Summary
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    Elderly hypertensive patients exhibit impaired baroreflex heart rate responses compared to younger individuals. This suggests altered clinical responses to antihypertensive medications in older adults.

    Area of Science:

    • Cardiovascular Physiology
    • Geriatric Medicine
    • Hypertension Research

    Background:

    • Baroreflex dysfunction is a hallmark of hypertension.
    • Aging impacts cardiovascular regulation.
    • Understanding baroreflex function in elderly hypertensives is crucial for treatment optimization.

    Purpose of the Study:

    • To compare baroreflex sensitivity and variability in elderly hypertensive patients versus young hypertensive and normotensive individuals.
    • To investigate age-related differences in baroreflex heart rate responses.

    Main Methods:

    • Intravenous nitroprusside infusion to reduce mean arterial pressure by 20%.
    • Assessment of baroreflex function via blood pressure and heart rate (R-R interval) changes.
    • Comparison between elderly hypertensives (n=10), young hypertensives (n=10), and young normotensives (n=7).

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    Main Results:

    • Elderly hypertensive subjects showed greater sensitivity and variability in response to nitroprusside.
    • Heart rate increases in the erect position were significantly attenuated in elderly hypertensives.
    • The relationship between blood pressure and R-R interval changes (baroreflex slope) was diminished in elderly patients.

    Conclusions:

    • The heart rate component of the baroreflex is impaired in elderly hypertensive patients.
    • Altered baroreflex function in elderly hypertensives may influence their response to antihypertensive drugs.