Patients with a short P-R interval had significantly lower ST-J and ST segment amplitudes in lead CR5 during and 3 minutes after exercise compared to matched controls.
Case-Control (n=24)
Does a short P-R interval affect ST segment amplitudes during and after a multiple-stage graded exercise test?
Patients with a short P-R interval exhibit significantly lower ST-J and ST segment amplitudes during and after exercise, which should be considered when evaluating exercise electrocardiograms to avoid misinterpretation.
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 CR 5 , 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.
Åstrand et al. (Sun,) conducted a case-control in Short P-R interval (n=24). Short P-R interval vs. Normal P-R interval (age and sex matched controls) was evaluated on ST-J and ST segment amplitudes in lead CR5 during and 3 min after exercise. Patients with a short P-R interval had significantly lower ST-J and ST segment amplitudes in lead CR5 during and 3 minutes after exercise compared to matched controls.
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