Key result
Among patients without prior myocardial infarction who developed exercise-induced ST-segment elevation, coronary vasospasm was the most common underlying pathology, found in 6 of the 9 cases.
Observational (n=9)
No
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In Taiwanese patients without prior MI, exercise-induced ST-segment elevation is frequently caused by coronary vasospasm, suggesting a role for coronary angiography with ergonovine provocation testing.
BACKGROUND: Exercise-induced ST-segment elevation is a relatively uncommon problem and occurs more frequently in patients who have had a myocardial infarction. Data is limited on the characteristics of Taiwanese patients without prior myocardial infarction who develop exercise-induced ST-segment elevation. METHODS AND RESULTS: Exercise-induced ST-segment elevation developed in 9 of 6,147 consecutive patients without myocardial infarction who underwent treadmill exercise testing at out institution over a 4-year period. The clinical and angiographic characteristics of these patients were studied. Angiographically normal coronary arteries with coronary vasospasm were found in 5 patients, hemodynamically significant coronary stenosis was found in 3 patients, and coexisting spasm in angiographically normal coronary arteries combined with hemodynamically significant coronary stenosis in the different vessel was found in 1 patient. During a median follow-up of 71 months, 2 patients with coronary vasospasm developed recurrent angina after self-discontinuation of calcium antagonists and 2 patients (1 with coronary vasospasm and 1 with hemodynamically significant coronary stenosis) died of cardiac causes before arrival at the emergency department. CONCLUSION: Coronary vasospasm was a more common underlying pathology of exercise-induced ST-segment elevation in this Taiwanese cohort. Coronary angiography +/- intracoronary ergonovine provocation testing is necessary in these patients to identify the underlying pathology and appropriate treatment.
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Hung et al. (2006) conducted an observational in Exercise-induced ST-segment elevation without prior myocardial infarction (n=9). Exercise-induced ST-segment elevation was evaluated on Underlying angiographic pathology (coronary vasospasm vs. hemodynamically significant stenosis). Among patients without prior myocardial infarction who developed exercise-induced ST-segment elevation, coronary vasospasm was the most common underlying pathology, found in 6 of the 9 cases.
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