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The electrocardiographic response to maximal treadmill exercise of asymptomatic men with right bundle branch block
Insights
This study found exercise testing sensitivity for coronary artery disease uncertain in men with right bundle-branch block. However, abnormal ST depression warrants further cardiac evaluation in this population.
Area of Science:
- Cardiology
- Exercise Physiology
- Diagnostic Testing
Background:
- Right bundle-branch block (RBBB) can affect exercise test interpretation.
- Coronary artery disease (CAD) prevalence in asymptomatic individuals with RBBB is not well-defined.
- The diagnostic utility of treadmill testing in this specific demographic requires clarification.
Purpose of the Study:
- To evaluate the accuracy of maximal treadmill testing in detecting coronary artery disease (CAD) in asymptomatic men with acquired right bundle-branch block (RBBB).
- To assess the relationship between RBBB, exercise capacity, and angiographically confirmed CAD.
Main Methods:
- Recruited 40 asymptomatic, healthy men with acquired right bundle-branch block.
- Performed maximal treadmill testing to assess exercise response.
- Conducted cardiac catheterization to determine the presence and severity of coronary artery disease.
Main Results:
- All participants exhibited normal maximal oxygen consumption, heart rate, and blood pressure responses to exercise.
- No abnormal ST-segment changes were observed during maximal treadmill testing in any participant.
- Eight men (20%) were diagnosed with significant angiographic coronary artery disease, including six with single-vessel disease.
Conclusions:
- The sensitivity of exercise testing for detecting coronary artery disease in men with right bundle-branch block remains uncertain due to the lack of abnormal findings.
- The study suggests a potentially high specificity of exercise testing, indicating that abnormal ST-segment depression in RBBB patients warrants further investigation for CAD.
Abstract:
This study presents the results of maximal treadmill testing and cardiac catheterization in 40 asymptomatic and apparently healthy men with acquired right bundle-branch block. Eight of the men had significant angiographic coronary artery disease, and six of the eight only had single-vessel disease. The 40 men had normal maximal oxygen consumptions, normal maximal heart rates, and normal maximal blood pressure responses; none of the men had abnormal ST-segment changes in response to maximal treadmill testing. Thus, the sensitivity of exercise testing for coronary artery disease in men with right bundle branch block is uncertain. However, the apparently high specificity of exercise testing demonstrated by this study necessitates further evaluation for coronary artery disease in men with right bundle branch block who develop abnormal ST-segment depression in response to exercise testing.