Early and late atrioventricular block in acute inferior myocardial infarction

摘要: In a group of 288 patients with acute inferior (diaphragmatic) myocardial infarction, second and third degree atrioventricular (AV) block was diagnosed in 37 (14%). Three the died. The AV 34 survivors could be differentiated into two distinct types, namely, early late block. 15 patients, developed within 6 hours first signs infarction. these all disappeared 24 after Second appeared suddenly vast majority, lirst detected only few for very short time before normalization conduction. Atropine either abolished completely or caused marked acceleration ventricular escape rhythm. 14 later than (in 12 hours) It heralded followed by relatively long periods cases (except who were admitted 72 infarction). total duration longer 40 rate high. no patient abolishment achieved atropine, slight all. five recognized consecutively. types seem to have different causes. Increased vagal tone is probably operative type, metabolic changes due ischemia second. Response atropine sympathomimetic drugs much better, cardiac pacing rarely indicated, those