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Exercise-induced inverted U wave in asymptomatic high-risk subjects. A preliminary study
A M Salmasi1, R Abraham, A al-Kutoubi
1Irvine Laboratory for Cardiovascular Investigation and Research, St. Mary's Hospital, London, England.
Angiology
|September 1, 1994
Summary
Exercise-induced inverted U waves on ECG reliably detect silent coronary artery disease (CAD) in high-risk individuals. This ECG sign accurately maps to specific coronary artery territories, aiding diagnosis and guiding treatment decisions.
Area of Science:
- Cardiology
- Diagnostic Electrocardiography
Background:
- Occult coronary artery disease (CAD) poses risks for asymptomatic individuals.
- Identifying silent myocardial ischemia is crucial for early intervention.
Purpose of the Study:
- To evaluate exercise-induced inverted U waves as a diagnostic marker for occult CAD.
- To assess the correlation between U wave inversion patterns and coronary artery territories.
Main Methods:
- Utilized sixteen-lead ECG chest wall mapping during exercise stress tests.
- Studied 133 asymptomatic high-risk patients (hyperlipidemia, diabetes) with normal resting ECGs.
- Correlated ECG findings with subsequent coronary arteriography and revascularization outcomes.
Main Results:
- Exercise-induced inverted U waves were observed in 8 patients, indicating disease in 11 coronary artery territories.
- Coronary arteriography confirmed the territorial distribution of inverted U waves.
- U wave inversion resolved after coronary artery bypass grafting in 2 patients.
Conclusions:
- Exercise-induced inverted U waves are a reliable indicator of silent myocardial ischemia in asymptomatic high-risk subjects.
- The spatial distribution of inverted U waves predicts significant disease in specific coronary artery territories.
- Resolution of U wave inversion post-revascularization supports its ischemic origin.