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Baroreceptor reflexes after coarctectomy

E Hanson, B O Eriksson, R Sivertsson

    Clinical Physiology (Oxford, England)
    |October 1, 1981
    PubMed
    Summary
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    Patients with coarctation of the aorta show reduced baroreflex sensitivity, which improves after surgical repair. This suggests that baroreceptor resetting in hypertension is reversible when blood pressure is lowered.

    Area of Science:

    • Cardiovascular physiology
    • Hypertension research

    Background:

    • Hypertension is linked to impaired baroreflex sensitivity.
    • Coarctation of the aorta causes upper body hypertension.
    • Baroreflex sensitivity reduction correlates with blood pressure elevation.

    Purpose of the Study:

    • To assess baroreflex sensitivity in young men operated for coarctation of the aorta.
    • To compare baroreflex sensitivity in operated coarctation patients with normotensive and hypertensive groups.
    • To investigate the reversibility of baroreceptor resetting after blood pressure reduction.

    Main Methods:

    • Baroreflex sensitivity estimated via R-R interval prolongation.
    • Transient blood pressure rise induced by angiotensin injections.
    • Comparison with age- and sex-matched normotensive and hypertensive controls.

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    Main Results:

    • Coarctation patients had slightly elevated resting blood pressure.
    • Baroreflex sensitivity was proportionally reduced in coarctation patients.
    • Sensitivity was higher than expected for their pre-operative blood pressure.

    Conclusions:

    • Baroreceptor resetting in hypertension appears to be significantly reversible.
    • Lowering blood pressure post-coarctation surgery can restore baroreflex function.
    • Early surgical intervention may mitigate long-term cardiovascular risks.