Abstract
Abstract. Twelve patients with a P‐R interval of 0.12 sec or less and no delta wave or ST‐T changes in the resting ECG performed a multiple‐stage graded exercise test. For each of these patients a control subject of the same age and sex was selected. The controls fulfilled the same requirements as the patients except for short P‐R interval. ST segment amplitudes were not significantly different at rest in the two groups. ST‐J and ST segment amplitudes in lead CR5, were, however, significantly lower in the group with short P‐R interval both during and 3 min after exercise. This observation is important to keep in mind when evaluating exercise electrocardiograms.
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