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Related Experiment Videos

Cardiovascular effects of protamine sulfate

C E Green, C B Higgins, M J Kelley

    Investigative Radiology
    |July 1, 1981
    PubMed
    Summary

    Protamine sulfate can cause hypotension due to peripheral vasodilation, not direct myocardial depression. This study in dogs clarifies the circulatory effects of protamine sulfate administration.

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    Area of Science:

    • Cardiovascular Physiology
    • Pharmacology

    Background:

    • Protamine sulfate administration post-arteriography or cardiopulmonary bypass is linked to hypotension.
    • The exact mechanism, whether vasodilatation or myocardial depression, remains unclear.

    Purpose of the Study:

    • To investigate the direct myocardial and systemic circulatory effects of protamine sulfate.
    • To differentiate between vasodilatation and myocardial depression as causes of hypotension.

    Main Methods:

    • Seven anesthetized dogs were used to assess protamine sulfate's effects.
    • Intracoronary administration evaluated direct myocardial function; intravenous administration assessed systemic circulation.
    • Effects were studied in both normal and ischemic myocardial states.

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    Main Results:

    • Intracoronary protamine sulfate did not significantly alter left ventricular contractility, even during ischemia.
    • Intravenous protamine sulfate administration resulted in hypotension.
    • Hypotension was attributed to peripheral vasodilation.

    Conclusions:

    • Protamine sulfate-induced hypotension is primarily caused by peripheral vasodilation.
    • Direct myocardial depression is not a significant factor in the hypotensive response to protamine sulfate.