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Related Experiment Videos

Two forms of vasoconstriction in systemic hypertension.

J H Laragh1

  • 1Cardiovascular Center, New York Hospital-Cornell Medical Center, New York 10021.

The American Journal of Cardiology
|October 30, 1987
PubMed
Summary

Essential hypertension is not a single condition but a spectrum of diseases. Two distinct vasoconstriction mechanisms, one calcium-related and one renin-related, sustain high blood pressure and offer new therapeutic targets.

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Area of Science:

  • Cardiovascular Medicine
  • Nephrology
  • Pharmacology

Background:

  • Essential hypertension is traditionally viewed as a singular entity.
  • However, clinical and biochemical evidence suggests it is a heterogeneous condition.
  • The precise pathophysiological mechanisms underlying essential hypertension remain largely unknown.

Purpose of the Study:

  • To characterize essential hypertension as a heterogeneous spectrum of pathophysiologic processes.
  • To identify and quantify distinct mechanisms of sustained vasoconstriction in essential hypertension.
  • To explore the reciprocal interplay of these mechanisms in maintaining arteriolar tone.

Main Methods:

  • Quantification of two distinct vasoconstriction mechanisms in patients with essential hypertension.

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  • Identification of renin-independent (calcium-related) and renin-mediated (calcium-dependent) pathways.
  • Assessment of the influence of sodium balance and plasma renin levels on these mechanisms.

    • Main Results:

    • Two primary mechanisms sustain diastolic hypertension: a renin-independent pathway linked to abnormal calcium transport, and a renin-mediated pathway involving increased cytosolic calcium.
    • The renin-independent mechanism is associated with low plasma renin and ionized calcium, correctable by sodium depletion or specific blockade.
    • The renin-mediated mechanism is quantifiable by plasma renin levels or response to antirenin drugs.
    • These mechanisms interact reciprocally, with one predominating at the extremes of plasma renin levels and both operative in the mid-range.

    Conclusions:

    • Essential hypertension comprises a spectrum of pathophysiologic processes, not a single entity.
    • Understanding these distinct vasoconstriction mechanisms allows for pathophysiological stratification of patients.
    • This provides a basis for developing more precisely tailored therapeutic strategies for hypertension.