Abstract
The ambulatory electrocardiogram is a useful method for detecting complex arrhythmias in the late hospital phase of acute myocardial infarction (AMI) and exercise testing is usually used to detect cardiac reserve or ischemia or both.1,2 However, the changes in left ventricular (LV) performance during various daily activities cannot always be reproduced by the standard exercise test. Systolic time interval calculation is a useful noninvasive measure of cardiac function; ear densitography makes possible precise observation of changes in systolic time intervals under various conditions including upright exercise.3–5 We investigated the long-term ambulatory response of systolic time intervals during daily activities in patients recovering from AMI to evaluate the changes in LV performance to daily stresses.
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