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Limitation of exercise-induced R wave amplitude changes in detecting coronary artery disease in asymptomatic men
Insights
Changes in R wave amplitude during exercise stress tests improve specificity for detecting coronary artery disease in asymptomatic men. However, this method shows poor sensitivity and limited enhancement of diagnostic accuracy.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Coronary artery disease (CAD) diagnosis in asymptomatic individuals is crucial.
- Exercise electrocardiography (ECG) is a common stress testing modality.
- Evaluating novel ECG parameters for improved diagnostic accuracy is ongoing.
Purpose of the Study:
- To assess the diagnostic value of R wave amplitude changes during exercise ECG.
- To compare the efficacy of R wave amplitude changes versus ST segment changes in detecting CAD.
- To determine the combined diagnostic utility of R wave and ST segment criteria.
Main Methods:
- Analysis of exercise electrocardiograms from 255 asymptomatic men.
- Correlation of ECG findings with cardiac catheterization results.
- Evaluation of R wave amplitude and ST segment changes in bipolar leads (X, Y, Z).
Main Results:
- An abnormal ST segment response had a predictive value of 29% for CAD.
- Incorporating R wave amplitude changes improved the predictive value to 42%, with 28% sensitivity and 87% specificity.
- R wave amplitude changes enhanced specificity but not sensitivity or overall predictive value.
Conclusions:
- Exercise-induced R wave amplitude changes increase the specificity of stress testing for coronary disease in asymptomatic men.
- The poor sensitivity and limited enhancement of predictive value restrict the diagnostic utility of R wave amplitude criteria.
- Current R wave amplitude criteria show limited addition to the overall diagnostic accuracy of stress testing for CAD.
Abstract:
The exercise electrocardiograms of 255 asymptomatic men were analyzed for changes in R wave amplitude and ST segments. The results were correlated with findings at cardiac catheterization. There were 65 men with coronary artery disease and 190 normal subjects. R wave amplitude changes were evaluated in bipolar leads X, Y and Z. The predictive value of an abnormal ST segment response for detecting disease was only 29%. This value was improved to 42% using R wave amplitude changes with a sensitivity of 28% and specificity of 87%. Exercise-induced R wave amplitude changes enhance the specificity of detecting coronary disease in asymptomatic men over ST segment criteria alone but the sensitivity is poor and the predictive value is not enhanced. Thus, these criteria are limited in adding to the diagnostic accuracy of stress testing.