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Repeat hemodynamic determinations in borderline hypertension.

Y A Weiss, M E Safar, G M London

    The American Journal of Medicine
    |March 1, 1978
    PubMed
    Summary
    This summary is machine-generated.

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    Borderline hypertension in young men shows increased systolic pressure and normalized cardiac output over time. Blood volume changes become more critical in regulating cardiac output.

    Area of Science:

    • Cardiovascular Physiology
    • Hypertension Research

    Background:

    • Borderline hypertension is a precursor to sustained hypertension.
    • Understanding hemodynamic changes in borderline hypertension is crucial for early intervention.

    Purpose of the Study:

    • To investigate hemodynamic alterations in young men with borderline hypertension over a short-term follow-up period.
    • To compare hemodynamic parameters between individuals with borderline hypertension and normotensive controls.

    Main Methods:

    • Longitudinal study involving 37 young men with borderline hypertension.
    • Repeat hemodynamic measurements including blood pressure, cardiac index, heart rate, total peripheral resistance, and blood/plasma volumes.
    • Comparison with matched normal subjects at each determination point.

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    Main Results:

    • Systolic and mean arterial pressures significantly increased over the follow-up period.
    • Cardiac index and heart rate decreased to normal levels, while total peripheral resistance increased.
    • Correlation analysis revealed a shift in cardiac output control, with blood volume becoming more significant than heart rate over time.

    Conclusions:

    • Young men with borderline hypertension exhibit a greater rise in systolic than diastolic pressure.
    • Cardiac output normalizes through decreased heart rate and blood volume.
    • Volume factors play an increasingly important role in cardiac output regulation in borderline hypertension.