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[ST-segment depression and R-amplitude changes during bicycle stress test in patients with coronary artery disease
Insights
ST-segment depression is more sensitive and specific than R-wave amplitude changes for diagnosing coronary artery disease (CAD) via stress tests. R-wave amplitude changes showed considerable intraindividual variability, questioning its diagnostic utility.
Area of Science:
- Cardiology
- Diagnostic Imaging
Context:
- Coronary artery disease (CAD) diagnosis relies on non-invasive methods.
- Bicycle stress tests are commonly used for CAD assessment.
Purpose:
- To compare the diagnostic accuracy of ST-segment depression versus R-wave amplitude changes during stress tests for CAD.
- To evaluate the intraindividual variability of R-wave amplitude measurements in CAD patients.
Summary:
- This study compared ST-segment depression and R-wave amplitude changes in 56 patients undergoing stress tests and coronary angiography.
- ST-segment depression demonstrated higher sensitivity (76%) and specificity (71%) compared to R-wave amplitude changes (50% sensitivity, 50% specificity).
- R-wave amplitude showed significant intraindividual variability in repeated tests, raising doubts about its reliability for CAD diagnosis.
Impact:
- Findings suggest ST-segment depression is a more reliable non-invasive marker for CAD detection than R-wave amplitude changes.
- The study questions the clinical utility of R-wave amplitude analysis in non-invasive CAD diagnostic procedures.
- Highlights the importance of consistent and reliable diagnostic markers in cardiovascular disease assessment.
Abstract:
56 patients were examined with bicycle stress tests. Sensitivity and specificity of ST-segment depression were compared with R-wave amplitude changes. All patients had a coronary angiography because of suspected coronary artery disease (CAD). The specificity of ST-segment depression was 71%, for R-wave amplitude changes 50%. The sensitivity for ST-segment depression was 76% and for R-wave amplitude changes 50%. In addition in 7 patients with angiographically demonstrated CAD repeated stress tests were done. The ST-segment changes were nearly constant in all examinations, whereas the R-wave amplitude in V5 in 5 out of 7 patients changed considerably between decrease and increase. Considering these intraindividual changes, it seems doubtful whether the evaluation of the R-wave amplitude proves to be an improvement of the non-invasive diagnostic procedures of CAD.