Why the study?
Does aortocoronary bypass surgery eliminate electrical alternans of the ST segment in a patient with non-Prinzmetal's angina?
Does aortocoronary bypass surgery eliminate electrical alternans of the ST segment in a patient with non-Prinzmetal's angina?
Answers are grounded in this paper and cite their sources.
Electrical alternans of the ST segment can occur in myocardial ischemia caused by severe atherosclerotic coronary artery disease, not just Prinzmetal's angina, and can resolve with revascularization.
Elevated electrical alternans of the elevated ST segment (STEA) was documented in a patient with non-Prinzmetal's or classical angina and severe atherosclerotic coronary artery disease. STEA was precipitated during graded exercise testing. The disappearance of this phenomenon after aortocoronary bypass surgery suggests that the coronary obstructions were the etiologic factors. These findings emphasize that the STEA may occur in myocardial ischemia caused by conditions other than Prinzmetal's angina.
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DEMIDOWICH et al. (1980) studied this question.
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