Abstract
There are a number of reports on the electrocardiogram of myocardial infarction, but the problems on an early stage of infarction require further investigations.
1. On investigating the electrocardiograms of a total of 43 cases of acute myocardial infarction including 13 cases in which relatively frequent follow-up of their cardiograms from the early stage of infarct paroxysms, elevation of ST and repeated appearance of terminal inversion were recognized rather frequently in spite of the absence of recurrent paroxysms, and accordingly, they were considered as normal findings. In some cases, the changes of ST·T appeared repeatedly.
2. On the 20 cases in which the follow-up of their cardiograms from the time as early as within 24 hours after developing infarct paroxysms, the time of the appearance of abnormal Q was investigated. On unipolar precordial lead, the appearance of abnormal Q was recognized within 12 hours on more than half of the cases examined. On aVF lead, however, not a few cases showed slight retardation.
