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Present status of exercise testing in the evaluation of coronary artery disease
Insights
Modern multistage exercise testing improves diagnostic accuracy and patient safety for coronary artery disease (CAD). Key factors include ECG criteria, lead systems, and hemodynamic responses for effective CAD screening and prognosis.
Area of Science:
- Cardiology
- Exercise Physiology
Background:
- Exercise testing is crucial for diagnosing and managing coronary artery disease (CAD).
- Traditional exercise protocols have limitations in accuracy and safety compared to modern methods.
Purpose of the Study:
- To review the current status of exercise testing in CAD.
- To discuss optimal protocols, ECG criteria, lead systems, and hemodynamic responses for improved diagnostic accuracy and patient safety.
Main Methods:
- Review of existing literature on exercise testing protocols, ECG interpretation, and hemodynamic monitoring in CAD.
- Analysis of diagnostic significance of various exercise-induced electrocardiogram (ECG) alterations.
- Evaluation of different ECG lead systems and their impact on test accuracy.
Main Results:
- Multistage exercise protocols offer superior diagnostic accuracy and safety over single-stage tests.
- Established clinical significance of horizontal and downsloping ST depression; other ECG changes require further investigation.
- Inadequate ECG lead systems are a major cause of false negatives; multiple lead systems enhance accuracy.
- Recommended lead system for routine screening: simultaneous recording of CC5 or CM5, V3, and CL or III.
- Exercise time, heart rate, and blood pressure responses are vital for assessing CAD severity and prognosis.
Conclusions:
- Multistage exercise testing with appropriate ECG lead systems and hemodynamic monitoring is essential for accurate CAD diagnosis, risk stratification, and patient safety.
- Optimized protocols and lead systems contribute to cost-effective CAD screening.
Abstract:
The present status of exercise testing in coronary artery disease (CAD) was discussed in respect to test protocols, ECG criteria and lead systems, and hemodynamic responses. Advantages of modern multistage protocols over single-stage ones such as Master two-step tests are obvious in diagnostic accuracy and patient's safety. Clinical significance of horizontal and downsloping ST depression has already been established. Diagnostic significance of other exercise-induced ECG alterations such as slow upsloping ST depression, ST elevation, U-wave inversion, and R-wave amplitude changes was discussed. The latter parameter is still controversial as to its clinical significance. Use of an inadequate ECG lead system is one of major causes of false negative tests. Necessity of multiple lead systems was emphasized for higher diagnostic accuracy. From the view point of cost-efficacy relation, we will recommend simultaneous recording of CC5 or CM5, V3 and CL or III in routine exercise testing for screening of CAD. Test results such as exercise time, and heart rate and systolic blood pressure responses are also useful parameters for the evaluation of the severity and prognosis of CAD. It was emphasized that in exercise monitoring of ECG and blood pressure is indispensible in multistage exercise testing for improvement of diagnostic accuracy as well as patient's safety.