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Nitroglycerin and arterial compliance.

H Westling, H Anderson

    Acta Pharmacologica Et Toxicologica
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Nitrates primarily relax veins and arteries, lowering blood pressure and improving blood flow. This vascular relaxation, particularly in capacitance vessels, enhances coronary perfusion and may be studied using simple arterial pulsation measurements.

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    Area of Science:

    • Cardiovascular Physiology
    • Pharmacology

    Background:

    • Nitrates are widely used to treat cardiovascular conditions.
    • Understanding their precise hemodynamic effects is crucial for optimizing therapy.

    Purpose of the Study:

    • To elucidate the primary and secondary effects of nitrates on the circulatory system.
    • To explore the mechanisms behind blood pressure reduction and improved coronary perfusion.
    • To suggest novel methods for assessing nitrate tolerance.

    Main Methods:

    • The study describes methods for measuring arterial compliance.
    • It analyzes the effects of nitrates on venous and arterial capacitance vessels.
    • It discusses the secondary effects on resistance vessels (arterioles).

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    Main Results:

    • Nitrates primarily cause relaxation of capacitance vessels (venous and arterial).
    • Arteriolar dilatation is a secondary effect or occurs at higher doses.
    • Nitroglycerin administration leads to lower systolic blood pressure and improved "Windkessel" function, augmenting diastolic pressure and coronary perfusion.

    Conclusions:

    • Nitrate-induced vascular relaxation, especially of capacitance arteries, explains observed hemodynamic changes.
    • Improved arterial compliance and "Windkessel" function contribute to enhanced coronary perfusion.
    • Simple measurements of arterial pulsations may offer a viable approach for studying nitroglycerin tolerance.