Ambulatory ST-recording has no additional value to exercise test for identification of severe coronary lesions after an episode of unstable coronary artery disease in men.
One month after an episode of unstable coronary artery disease, 95 male patients performed coronary angiography, 48 hours ambulatory ST-recording and also an exercise test. ST-depression occurred in 29.5% during the ST-recording and in 44.2% during the exercise test (p < 0.05). In patients with ST-depression at ambulatory monitoring, 79% demonstrated the same finding at the exercise test. A high risk response at the exercise test--defined as either ST-depression in > or = 3 leads, ST-depression in 1-2 leads with a maximal work load below the 60th percentile or a maximal work load below the 30th percentile regardless of the ECG reaction--occurred in 56.8%. Severe coronary lesions--defined as three vessel disease, left main stenosis or proximal left anterior descending artery stenosis as part of two vessel disease--was observed in 46.3%. Patients with a high risk exercise test response and patients with ST-depression during ST-recording had severe coronary lesions in 67% and 64% respectively. However, a high risk exercise test response occurred in 82%, while ST-depression at ambulatory monitoring was observed only in 41% of the patients with severe coronary lesions (p < 0.001). Thus, ambulatory ST-recording one month after an episode of unstable coronary artery disease in men adds no further information to a symptom limited exercise test in order to identify patients with severe coronary lesions.
Karlsson
J E
JE
Department of Cardiology, University Hospital, Linköping, Sweden.
Björkholm
A
A
Blomstrand
P
P
Ohlsson
J
J
Wallentin
L
L
D000328:Adult; D000368:Aged; D000789:Angina, Unstable / Q000150:complications*; D003327:Coronary Disease / Q000175:diagnosis*; D004311:Double-Blind Method; D015716:Electrocardiography, Ambulatory; D005080:Exercise Test; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies