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Coronary physiology.

E O Feigl

    Physiological Reviews
    |January 1, 1983
    PubMed
    Summary

    Research on coronary blood flow has advanced, improving understanding of physical forces and autonomic control. However, complete understanding of coronary vascular resistance and local metabolic control remains elusive, highlighting areas for future investigation.

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    Area of Science:

    • Cardiovascular Physiology
    • Coronary Circulation
    • Autonomic Nervous System

    Background:

    • Significant progress has been made in understanding coronary physiological research since 1964.
    • Areas include transmural blood flow distribution, local metabolic control (adenosine hypothesis), and autonomic control.
    • Improved understanding of intramyocardial pressure and extravascular forces exists, yet physical determinants of coronary resistance are not fully understood.

    Purpose of the Study:

    • To review and synthesize current knowledge in normal coronary physiological research.
    • To identify gaps in understanding regarding local metabolic and autonomic control of coronary blood flow.
    • To highlight unresolved questions and new research directions in the field.

    Main Methods:

    • Review of existing literature and research findings on coronary physiology.
    • Analysis of studies measuring blood flow distribution, metabolic control mechanisms, and autonomic influences.
    • Consideration of experimental data on factors affecting coronary vascular resistance.

    Main Results:

    • The subendocardium is more vulnerable to underperfusion than the subepicardium during compromised circulation.
    • The roles of tissue oxygen tension, carbon dioxide, and adenosine in normal coronary regulation remain unclear.
    • Sympathetic and parasympathetic influences on coronary blood flow require further investigation for their roles in normal conditions.

    Conclusions:

    • Despite advances, a unified hypothesis for local metabolic control of coronary blood flow is lacking.
    • The precise importance of sympathetic vasoconstriction and parasympathetic vasodilation in normal resting conditions is not established.
    • New knowledge continually refines existing questions and generates novel research inquiries in coronary physiology.

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