The electrocardiographic changes were studied in autopsyproven fresh atrial infarction and compared with the morphological pattern of the lesion. The infarction was found to localize predominantly in the posterior wall of the right atrium. The morphological pattern of atrial infarction was similar to the changes developing in focal lesions of the left ventricular myocardium. The electrocardiographic pattern was characterized by the development of various rhythm and conductivity disorders, PQ (S-TP) segment shift, longer duration of the P wave, changes in its morphology, increase in the Macrus index. The electrocardiographic signs were demonstrated most comprehensively in cases of transmural lesions and with approximately the same rate on the 1st, 2nd, and 3rd day of the lesion.
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