[Exercise ECG and localization of coronary artery stenoses]
Øyvind Skjaeggestad1, Odd Johansen, Harald Arnesen
1Hjertemedisinsk avdeling, Ullevål universitetssykehus, 0407 Oslo.
Background:
ST segment depressions in exercise ECG are nearly always seen in the precordial leads V4-6. We wanted to investigate if other localizations of ST depressions give further informations.
Material And Methods:
The material originates from the CART study in which 365 patients had an exercise ECG performed shortly before coronary angiography. All patients included had at least one stenosis with more than 60% diameter reduction.
Results:
175 patients (48%) got ST depressions, of whom 162 (92%) got these changes in the precordial leads V4-6. 52 patients (30%) also got ST depressions in the inferior leads II/aVF; 12 (8%) only in these leads. The distribution of coronary artery stenoses and the frequency of earlier Q-wave infarctions were the same, independent of where the ST depressions were localized.
Interpretation:
ST segment depressions seen during exercise ECG do not give information on the localization or extent of coronary artery stenoses.
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