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ST-Segment Depression in Hyperventilation Indicates a False Positive Exercise Test in Patients with Mitral Valve
Andreas P Michaelides1, Charalampos I Liakos, Charalambos Antoniades
1Exercise Laboratory, 1st University Department of Cardiology, Athens Medical School, Hippokration Hospital, 15772 Athens, Greece.
Mitral valve prolapse (MVP) can cause false positive exercise tests (ET). ST-segment depression during hyperventilation is a key indicator to identify these false positives in MVP patients.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Clinical Electrocardiography
Background:
- Mitral valve prolapse (MVP) is recognized as a potential cause of false positive exercise tests (ET).
- Distinguishing true cardiac events from false positives in MVP patients requires refined diagnostic criteria.
- Accurate ET interpretation is crucial for appropriate patient management and avoiding unnecessary interventions.
Purpose of the Study:
- To identify additional electrocardiographic criteria for differentiating false positive exercise tests in patients with mitral valve prolapse.
- To enhance the diagnostic accuracy of exercise testing in individuals with MVP.
Main Methods:
- A cohort of 218 patients with confirmed MVP underwent treadmill exercise testing and coronary angiography.
- Patients were categorized based on angiography results: normal coronary arteries (false positive ET) or coronary artery disease (CAD).
- Electrocardiographic findings, specifically ST-segment depression during the hyperventilation phase, were analyzed.
Main Results:
- Out of 218 patients, 90 had normal coronary arteries (false positive ET), and 128 had CAD.
- ST-segment depression during hyperventilation was observed in 60% of the false positive ET group (Group A) versus 11% in the CAD group (Group B).
- This difference was statistically significant (P < .05), indicating a strong association.
Conclusions:
- The presence of ST-segment depression during the hyperventilation phase is a significant predictor of false positive exercise tests in patients with mitral valve prolapse.
- This electrocardiographic finding can aid clinicians in accurately interpreting exercise test results for MVP patients.
- Incorporating hyperventilation phase analysis may improve the specificity of exercise testing in this population.
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