Abstract
In the third week after acute myocardial infarction, mean 18 days, exercise tests have been performed in 209 patients prior to discharge from the Coronary Care Unit. The exercise was done on a bicycle ergometer with electrically controlled braking, starting at the load 300 kpm/min (equal to 50 W), increasing with 300 kpm/min every 6th min, aiming at a maximal symptom-limited performance. ECG, in 3 extremity leads and 3 precordial leads, and heart rate (HR) were continuously recorded, and blood pressure (BP) was measured every minute. The most common cause for discontinuing exercise was fatigue (in 58%). Anginal pain or dyspnoea was the cause in 23.8%. Only in 9.1% was the exercise interrupted by the investigator because of rhythm disturbances or pronounced ST-T changes. Maximal work varied from 1 min exercise at 300 kpm/min to 6 min at 900 kpm/min (150 W); 18% of all patients were able to work for 6 min at 600 kpm/min (100 W). HR increased on an average from 80 beats/min at rest to 129 beats/min at maximal work load. Systolic blood pressure (SBP) increased on an average from 126 to 170 mmHg. The maximal values reached during exercise were HR 170/min, and SBP 270 mmHg. The product HR X SPB increased a little more than two-fold o...Continue Reading
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