Abstract
Summary Two cases of the WPW syndrome appearing after the development of myocardial infarction are reported. The pattern of myocardial infarction disappeared completely with the appearance of the preexcitation pattern on the patients' ECGs. It is assumed that an aberrant bundle became functional under the influence of increased autonomic nervous activity accompanying acute myocardial infarction. The aberrant bundle probably failed to propagate in the A-V direction prior to the development of myocardial infarction, but it occasionally succeeded in propagating in the V-A direction to form a circus movement loop with the A-V node. The occasional establishment of such circus movement may have been responsible for the episodes of supraventricular tachycardia in these two patients.
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