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Exercise stress test was performed prior to and after aortocoronary bypass surgery in 91 male patients in an attempt to quantitate the change of physical capacity after operation and to correlate this to clinical improvement and late shunt angiography. The mean maximal work load was significantly higher after than prior to surgery in all groups. In average the maximal work load increased 65%. No difference was found between patients who were operated on for stable angina pectoris and those with unstable angina or impending myocardial infarction. Patients, who subjectively were without symptoms or much better after surgery, had a higher maximal work load after operation than those who were subjectively less improved or worse. In a sub-group of patients the maximal oxygen consumption was calculated in per cent of normal values for the age. The mean maximal oxygen consumption increased from 59% prior to surgery to 76% of normal values after surgery.
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