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Structural cardiovascular adaptation and the consequences for baroreflexes.

A Zanchetti, G Mancia

    Hypertension (Dallas, Tex. : 1979)
    |November 1, 1984
    PubMed
    Summary
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    Hypertension alters arterial baroreflex control, affecting its afferent, central, and efferent pathways. The carotid sinus reflex readjusts to prevent further blood pressure increases, maintaining circulatory homeostasis.

    Area of Science:

    • Cardiovascular Physiology
    • Hypertension Research
    • Autonomic Nervous System Regulation

    Background:

    • Arterial baroreflex control is significantly altered in both experimental and human hypertension.
    • Hypertension impacts all components of the baroreflex: afferent, central, and efferent pathways.
    • Vascular stiffening and central mechanism resetting are key adaptations in hypertensive baroreflexes.

    Purpose of the Study:

    • To investigate the multifaceted changes in arterial baroreflex control during hypertension.
    • To elucidate the specific alterations in afferent, central, and efferent baroreflex components.
    • To understand the functional readjustment of baroreflexes in the context of hypertensive circulation.

    Main Methods:

    • Analysis of structural cardiovascular adaptations, including vascular wall stiffening.

    Related Experiment Videos

  • Examination of central baroreflex mechanism resetting.
  • Assessment of cardiopulmonary and carotid sinus baroreflex activity in hypertensive models and patients.

    • Main Results:

    • Cardiopulmonary baroreflexes are enhanced in early hypertension (young SHR, borderline hypertensive patients) due to reduced venous compliance.
    • Cardiac hypertrophy progression may reverse the enhanced cardiopulmonary reflex activity.
    • The carotid sinus reflex in hypertension is readjusted to protect against blood pressure increases, not decreases.

    Conclusions:

    • Hypertension involves complex alterations across the entire arterial baroreflex arc.
    • The baroreflex system demonstrates homeostatic readjustment to support the hypertensive state.
    • Enhanced cardiopulmonary afferent inhibition may buffer increased sympathetic activity to the kidney in early hypertension.