Stress-induced ST-segment elevation in patients without prior Q-wave myocardial infarction.

J Electrocardiol 2008 Jul-Aug;41(4):312-7. Epub 2008 May 19.

Heart Institute, Chaim Sheba Medical Center, 52 621 Tel HaShomer, Israel.

Background: Stress-induced ST-segment elevation is an uncommon finding that usually occurs in patients with prior myocardial infarction (MI). Our purpose was to assess the angiographic and clinical significance of this finding in patients without prior MI.

Methods: Of the 29002 consecutive ambulatory patients who underwent stress myocardial perfusion imaging over a 5-year period, 205 (0.7%) developed stress-induced ST-segment elevation, of whom 39 (19%) had no Q-wave MI in leads showing ST-segment elevation during either exercise (n = 31) or dipyridamole (n = 8) stress myocardial perfusion imaging. All 39 patients were hospitalized and underwent coronary angiography.

Results: Significant coronary artery disease was found in all 39 patients: 87% had critical (>or=90%) stenosis, and 59% had multiple vessel disease. During hospitalization, 37 patients (95%) underwent revascularization.

Conclusions: In patients without prior Q-wave MI, stress-induced ST-segment elevation is associated with critical coronary artery disease. Therefore, these patients should be considered for early coronary investigation.

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http://dx.doi.org/10.1016/j.jelectrocard.2007.12.005DOI Listing
August 2008

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