Prognostic value of a single exercise test 3 weeks after uncomplicated myocardial infarction.

Publisher Website
Google Scholar
Abstract
The prognostic value of exercise testing was assessed in 195 men, mean age 54 .+-. 8 yr, 3 wk after uncomplicated myocardial infarction. In the 1st 82 men, effort was terminated at a heart rate of 130 beats/min in the absence of limiting symptoms, exertional hypotension or ventricular tachycardia. In the last 113 men, heart rate was not used as an end point. No complications of exercise testing were noted. From 13 clinical and treadmill test characteristics, a stepwise multiple logistic regression program identified exercise-induced ST-segment depression (ST.dwnarw.) .gtoreq. 0.2 mV, angina pectoris and maximal work load < 4 multiples of resting energy expenditure (mets) as "risk factors" predictive of combined medical and surgical events (myocardial infarction, sudden death, cardiac arrest and coronary artery bypass surgery) in a subset of 92 patients followed 2 yr or more. Clinical characteristics and exercise-induced ventricular ectopic activity were not predictive of such events. Life-table analysis in the entire population of 195 men confirmed the increased probability of combined medical and surgical events in patients with one or more "risk factors". For medical events alone, ST.dwnarw. .gtoreq. 0.2 mV and maximal work load < 4 mets were predictive, whereas angina pectoris was not. ST .dwnarw. .gtoreq. 0.2 mV and exercise-induced angina pectoris were predictive of surgical events. Patients without evidence of congestive heart failure 3 wk after uncomplicated myocardial infarction can safely undergo symptom-limited exercise testing. Valuable prognostic information is gained that is independent of selected clinical characteristics.