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Related Experiment Videos

Does isosorbide-5-mononitrate influence left ventricular relaxation?

H O Hirzel, P Stoffel, H P Krayenbuehl

    Zeitschrift Fur Kardiologie
    |January 1, 1983
    PubMed
    Summary

    Isosorbide-5-mononitrate reduces heart preload and afterload, improving left ventricular relaxation speed. This study investigated its effects on cardiac function in patients, including those with coronary heart disease.

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    Area of Science:

    • Cardiology
    • Pharmacology
    • Cardiovascular Physiology

    Background:

    • Coronary heart disease (CHD) affects left ventricular function.
    • Isosorbide-5-mononitrate is a vasodilator used in cardiovascular medicine.
    • Understanding its impact on left ventricular relaxation is crucial for patient management.

    Purpose of the Study:

    • To evaluate the effects of isosorbide-5-mononitrate on left ventricular pressure and relaxation.
    • To assess changes in preload, afterload, and contractility following isosorbide-5-mononitrate administration.

    Main Methods:

    • High-fidelity left ventricular pressure measurements, echocardiograms, and electrocardiograms were performed.
    • 25 patients (21 with CHD) received 50 mg of isosorbide-5-mononitrate orally.
    • Measurements were taken before and 20 minutes after drug administration.

    Main Results:

    • Isosorbide-5-mononitrate significantly decreased left ventricular systolic pressure, end-diastolic pressure, and end-diastolic diameter.
    • Left ventricular peak stress (afterload) was reduced, while contractility (max dP/dt, systolic shortening) remained unchanged.
    • The time constant of left ventricular pressure decay (T) significantly decreased, indicating faster relaxation.

    Conclusions:

    • Peroral isosorbide-5-mononitrate reduces both preload and afterload in patients.
    • The drug enhances the speed of left ventricular relaxation, as evidenced by the reduced time constant (T).
    • The observed improvement in relaxation may be a direct pharmacological effect or due to reduced myocardial ischemia.

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