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Updated: Aug 11, 2026

In Vivo Quantitative Assessment of Myocardial Structure, Function, Perfusion and Viability Using Cardiac Micro-computed Tomography
Published on: February 16, 2016
Effect of beta blockade on silent regional left ventricular wall motion abnormalities
Beta-adrenergic blockade effectively improved regional left ventricular wall motion abnormalities in patients with coronary artery disease and silent myocardial ischemia during exercise. This treatment reduced exercise-induced reductions in regional ejection fraction, suggesting a benefit for myocardial oxygen supply-demand balance.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Pharmacology
Background:
- Coronary artery disease (CAD) and silent myocardial ischemia can lead to regional left ventricular (LV) wall motion abnormalities during exercise.
- Exercise testing is crucial for assessing myocardial ischemia and its impact on LV function.
Purpose of the Study:
- To investigate the effect of beta-adrenergic blockade on exercise-induced regional LV wall motion abnormalities in patients with CAD and silent myocardial ischemia.
- To determine if beta-blockade can mitigate the reduction in regional ejection fraction (EF) during exercise.
Main Methods:
- Eleven patients with CAD and silent myocardial ischemia underwent exercise testing.
- Gated left anterior oblique cardiac blood pool imaging was used to assess regional EF before and after beta-adrenergic blockade.
- Analysis focused on anteroseptal and inferoposterior regions supplied by stenotic coronary arteries.
Main Results:
- Before beta blockade, regional EF decreased in 15 out of 18 assessed regions during exercise.
- After beta blockade, only 6 out of 18 regions showed a decrease in regional EF (p < 0.05).
- The remaining 12 regions demonstrated no change or an increase in regional EF post-beta blockade.
Conclusions:
- Beta-adrenergic blockade effectively improved exercise-induced reductions in regional LV ejection fraction in patients with CAD and silent myocardial ischemia.
- A potential mechanism for this improvement is the reduction in myocardial oxygen requirement at peak exercise.
- Beta-blockade may be a valuable therapeutic strategy for managing silent myocardial ischemia in patients with coronary artery disease.
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