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Angiology
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Effect of Ischemia on Ventricular Contractility in Patients with Coronary Artery Disease

Leo J. Spaccavento

Cardiology Service/SGHMMC, Wilford Hall USAF Medical Center, Lackland AFB, San Antonio Texas

Eric D. Grassman

Cardiology Service/SGHMMC, Wilford Hall USAF Medical Center, Lackland AFB, San Antonio Texas

Warren M. Briesblatt

Cardiology Service/SGHMMC, Wilford Hall USAF Medical Center, Lackland AFB, San Antonio Texas

Robert S. Schwartz

Cardiology Service/SGHMMC, Wilford Hall USAF Medical Center, Lackland AFB, San Antonio Texas

The constant of elastance (E-MAX) is determined by measuring continuous left ventricular pressure and volume changes during the cardiac cycle. To evaluate the effect of myocardial ischemia on contractility, E-MAX was measured from serial pressure volume loops at baseline, with atrial pacing-induced ischemia,and after the administration of intravenous nitroglycerin with repeat pacing. Ten patients undergoing cardiac catheterization for presumed coronary artery disease were evaluated by this method. The severity of the coronary artery disease was graded angiographically by using the Gensini coronary score. In 8 of the 10 patients there was a significant decrease in E-MAX during atrial pacing (P < .05). With the administration of nitroglycerin there was an attenuation of the ischemic effect previously noted with pacing. In 3 of the 10 patients administration of nitroglycerin produced a further decrease in E-MAX with ischemia. All 3 patients had a significantly lower Gensini coronary score with a well-developed, visible coronary collateral network. The authors' results indicate that continuous pressure volume loop analysis is possible using the nuclear stethoscope. Significant ischemic changes are seen with atrial pacing, which are relieved by the administration of nitroglcerin, except in the presence of coronary collaterals.

Angiology, Vol. 41, No. 6, 486-491 (1990)
DOI: 10.1177/000331979004100611
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 ANGIOLOGYHome page
A. J. Crottogini
Letter To the Editor
Angiology, June 1, 1992; 43(6): 539 - 540.
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