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Effects of nitroglycerin on isometric exercise.

A P Flessas, T J Ryan

    American Heart Journal
    |February 1, 1983
    PubMed
    Summary

    Sublingual nitroglycerin (NTG) improves left ventricular performance in patients with ischemic heart disease during isometric exercise. NTG effectively reduces both preload and afterload, enhancing cardiac function under stress.

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    Area of Science:

    • Cardiology
    • Cardiovascular Physiology

    Background:

    • Ischemic heart disease (IHD) poses significant challenges to cardiac function, particularly during physical exertion.
    • Isometric handgrip exercise is a common stress test used to evaluate cardiac performance in IHD patients.
    • Nitroglycerin (NTG) is a vasodilator used to manage symptoms of IHD, but its effects during isometric exercise require further elucidation.

    Purpose of the Study:

    • To investigate the hemodynamic effects of sublingual nitroglycerin (NTG) on left ventricular performance during isometric handgrip exercise in patients with ischemic heart disease.
    • To determine if NTG alters preload and afterload during isometric exercise in this patient population.

    Main Methods:

    • Eight patients with diagnosed ischemic heart disease participated in the study.
    • Isometric handgrip exercise was performed for five minutes at 30% of maximum voluntary contraction.
    • Hemodynamic parameters, including left ventricular systolic pressure (LVSP), heart rate, cardiac index, stroke index, left ventricular stroke work index, systemic resistance, and left ventricular end-diastolic pressure, were measured before and after sublingual nitroglycerin administration.

    Main Results:

    • While the rise in LVSP during exercise was similar before and after NTG, the absolute LVSP was lower post-NTG.
    • No significant differences were observed in heart rate, cardiac index, stroke index, left ventricular stroke work index, or systemic resistance between pre- and post-NTG exercise.
    • Left ventricular end-diastolic pressure significantly decreased during post-NTG handgrip (18.3 +/- 14.4 mm Hg) compared to pre-NTG effort (31.4 +/- 17.6 mm Hg, P < 0.005).

    Conclusions:

    • Sublingual nitroglycerin effectively reduces preload and afterload in patients with ischemic heart disease, both at rest and during isometric exercise.
    • NTG administration improves left ventricular performance during isometric exercise by mitigating excessive increases in preload and afterload.
    • These findings suggest a beneficial role for NTG in managing cardiac stress responses in IHD patients.

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