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Exercise-induced left ventricular dysfunction in coronary heart disease. A model for studying the stunned myocardium
R Scognamiglio1, A Ponchia, G Fasoli
1Department of Cardiology, University of Padua, Italy.
European Heart Journal
|December 1, 1991
Summary
Exercise-induced myocardial stunning, characterized by persistent left ventricular dysfunction, can be effectively managed with nisoldipine. This drug reduces ischemia and improves ejection fraction, offering a model for studying stunning susceptibility and drug efficacy.
Area of Science:
- Cardiology
- Exercise Physiology
Background:
- Myocardial stunning involves diverse pathophysiological states, often linked to exercise-induced ischemia and coronary stenosis.
- Persistent contractile dysfunction after exercise is a key feature in some patients with coronary artery disease.
Purpose of the Study:
- To investigate exercise-induced myocardial stunning in patients with coronary artery disease.
- To evaluate the efficacy of nisoldipine in preventing and reversing myocardial stunning.
Main Methods:
- Exercise echocardiography was used to assess left ventricular (LV) volumes, wall motion, and myocardial thickening in 26 patients.
- Measurements were taken at rest and during exercise, with follow-up during recovery.
Main Results:
- All patients showed increased asynergy and decreased ejection fraction (EF) during exercise.
- Myocardial dysfunction persisted post-exercise in 84% of patients.
- Nisoldipine reduced asynergy, prevented EF decline during exercise, and normalized LVEF upon recovery.
Conclusions:
- Exercise-induced myocardial stunning is a significant issue in coronary artery disease.
- Nisoldipine effectively mitigates exercise-induced myocardial ischemia and stunning.
- This model allows for studying patient susceptibility and drug effectiveness in managing myocardial stunning.
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