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European Heart Journal 1999 20(16):1166-1174; doi:10.1053/euhj.1999.1577
Copyright © 1999 by the European Society of Cardiology.
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Prognostic value of maximum ST-vector magnitude during the first 24h of vectorcardiographic monitoring in patients with unstable angina pectoris

P. Abrahamssona,f1, K. Andersena, P. Erikssona and M. Dellborga

a Clinical Experimental Research Laboratory, Sahlgrenska University Hospital/Östra, Göteborg, Sweden

revised February 8, 1999; accepted February 17, 1999 1999

Abstract

Aims To assess the prognostic importance of alternate ways of quantifying myocardial ischaemia by continuous ST analysis, the maximum ST vector magnitude and the area under the ST vector magnitude trend curve during the first 24h of continuous ST monitoring.

Methods and Results During a 22-month period from 1991 to 1993, 195 patients admitted to our CCU with suspected unstable angina pectoris, were included in the study. During the first 24h the patients were monitored for ischaemic episodes with computerized vectorcardiography, using a MIDA 1000 system. Twenty seven (14%) of the 195 patients died or had a non-fatal myocardial infarction within 1 year and the maximum ST vector magnitude among those patients was, on average, 201µV compared with 118 µV in patients who survived 1 year free of myocardial infarction (P<0·01). The area under the ST vector magnitude trend curve was, on average, 1598µVmin compared with 164µVmin (P<0·01). By multivariate analysis, the maximum ST vector magnitude emerged as a superior predictor of death or myocardial infarction, compared with the area under the ST vector magnitude trend curve and the number of ST vector magnitude and ST change vector magnitude episodes. The maximum ST vector magnitude and age were independent predictors of death or non-fatal myocardial infarction within 1 year.

Conclusion Maximum ST vector magnitude during the first 24h of vectorcardiographic monitoring seems to be a strong predictor of subsequent death or non-fatal myocardial infarction.

Key Words: Unstable angina pectoris, prognosis, vectorcardiography

f1 Correspondence: P. Abrahamsson, Department of Medicine, Sahlgrenska Universitetssjukhuset/Östra, 416 85 Göteborg, Sweden.

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