title: Clinicopathological study of the heart and coronary arteries of autopsied cases from the community of Hisayama during a 10-year period. Part IV. QS waves in the precordial leads.
abstract: During a ten-year period, from November 1, 1961, to October 31, 1971, 339 residents aged 40 years or over at death were nonselectively autopsied in a Japanese community, Hisayama town (mean autopsy rate: 84%). One or more standard 12-lead ECGs plus V4R and V7 electrocardiograms taken at periodic medical examinations were available for 308 of them. In 46 persons, QS waves were localized in one or more leads from V1 to V4. By transverse sectioning of the hearts, old myocardial infarction extending into the interventricular septum was found in nine of these 46 persons. Frequency of myocardial infarction cases in each category for QS localization was as follows: Lead V1 to V4, three of three; Leads V1 to V3, six of nine; Leads V1 and V2, three of 15; Leads V2 and V3, none of two; Lead V3, none of one; Lead V2, one of eight; and Lead V1, one of 25.
mesh_terms: D000328:Adult; D000368:Aged; D002037:Bundle-Branch Block / Q000175:diagnosis; D006332:Cardiomegaly / Q000175:diagnosis; D003331:Coronary Vessels / Q000473:pathology*; D004562:Electrocardiography; D005260:Female; D006325:Heart Atria / Q000473:pathology; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000175:diagnosis; D009206:Myocardium / Q000473:pathology*