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Related Experiment Videos

Experimental angiotensin II hypertension

D B Young, R H Murray, R G Bengis

    The American Journal of Physiology
    |September 1, 1980
    PubMed
    Summary

    Angiotensin II (AII) infusion in dogs caused hypertension by increasing vascular tone, not blood volume. This study reveals how AII-induced hypertension develops through altered circulatory mechanics.

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    Area of Science:

    • Cardiovascular Physiology
    • Renal Physiology
    • Hypertension Research

    Background:

    • Angiotensin II (AII) is a key hormone implicated in blood pressure regulation.
    • Understanding the mechanisms of AII-induced hypertension is crucial for developing effective treatments.

    Purpose of the Study:

    • To investigate the hemodynamic and volume changes associated with AII-induced hypertension in dogs.
    • To elucidate the role of vascular tone and circulatory compliance in this hypertensive model.

    Main Methods:

    • Infusion of Angiotensin II (AII) at 10 ng x kg-1 x min-1 intravenously for 8 days in 13 large dogs.
    • Monitoring of arterial pressure, cardiac output, mean circulatory filling pressure (MCFP), and sodium balance.
    • Assessment of 22Na space and blood volume throughout the study.

    Main Results:

    • AII infusion significantly increased arterial pressure and mean circulatory filling pressure (MCFP).
    • Cardiac output decreased, while blood volume remained unchanged.
    • Initial sodium retention was followed by natriuresis, returning dogs to sodium balance.
    • A decrease in circulatory unstressed volume or compliance was inferred.

    Conclusions:

    • AII-induced hypertension in this model is characterized by increased arterial and venous vascular tone.
    • The rise in blood pressure occurs without significant volume expansion or cardiac output elevation.
    • Altered circulatory compliance plays a critical role in the development of AII-hypertension.

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