Related Experiment Videos
Factors influencing the diagnostic sensitivity of the exercise test in coronary artery disease
Insights
The exercise stress test accurately identified coronary artery disease in 62% of patients. However, severe arterial blockages and reduced heart function did not consistently predict a positive stress test result.
Area of Science:
- Cardiology
- Exercise Physiology
Background:
- Coronary artery disease (CAD) is a leading cause of mortality.
- Exercise stress testing is a common diagnostic tool for CAD.
Purpose of the Study:
- To evaluate the diagnostic accuracy of a continuous multistage bicycle ergometer test in patients with coronary artery disease.
- To identify factors influencing the sensitivity of the exercise stress test.
Main Methods:
- A continuous multistage bicycle ergometer test was administered to 50 CAD patients.
- Coronary angiography and left ventriculography were performed for comparison.
- Ischemic response was defined as ≥1 mm ST-segment depression.
Main Results:
- 62% of patients exhibited a positive ischemic response.
- Higher rates of positive tests were observed in patients with ≥75% stenosis or triple-vessel disease.
- Lower ejection fractions and asynergy were associated with fewer positive tests.
Conclusions:
- The exercise stress test demonstrates moderate sensitivity in detecting CAD.
- While severe stenosis and triple-vessel disease correlate with positive tests, factors like ejection fraction and asynergy show an inverse relationship.
- Exercise intensity, disease location, and collaterals did not significantly impact test sensitivity.
Abstract:
A continuous multistage bicycle ergometer test was performed on 50 patients with coronary artery disease. Selective cinecoronary angiography and left ventriculography were performed within a week of the test in all patients. Overall, 62% had a positive ischemic response, defined as 1 mm or greater depression of the ST segment. Patients with 75% or greater stenosis in any vessel and those with triple-vessel involvement had a higher incidence of positive tests. Those with low systolic ejection fractions and areas of asynergy had fewer positive tests than patients with normal ejection fractions and normal or minimal segmental wall motion abnormalities. The level of exercise, location of arterial disease and the presence of collateral blood supply to the diseased vessels did not appear to influence the sensitivity of the exercise stress test.