Cardiac memory-induced T wave change during complete atrioventricular block in a patient with inferior acute myocardial infarction.

Cardiac memory is an electrocardiographic manifestation of transient T wave abnormalities, which is observed after abrupt interruption of abnormal ventricular activation. We report a case with preexisting complete left bundle branch block in whom cardiac memory was induced. This cardiac memory was induced by normalization of QRS morphology after development of complete atrioventricular block due to acute inferior myocardial infarction. <Learning objective: Although T wave inversion can often be seen in acute coronary syndrome, cardiac memory might create unusual changes of T wave morphologies in the case with preexisting left bundle branch block. Premature beats arising from upstream of abnormal conduction site produced equalization of bi-ventricular activation in a case of preexisting complete left bundle branch block. This may cause normalization of the QRS complex and cardiac memory (T wave inversion).>.