Incidence of Abnormal Q and QS Patterns Classified by the Minnesota Code in 74 Autopsied Cases of Myocardial Infarction in the Aged

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Abstract
The incidence of abnormal Q and QS patterns classified by the Minnesota code in 74 cases of the aged, which were proved at autopsy to have myocardial infarcts, were reviewed with special reference to their size, location and the pathological type according to Wartman's classification. Incidence of the abnormal Q and QS patterns met in each criteria among the infarcted cases was as follows; I-1: 42%, I-2: 16%, I-3: 5%, and I-0: 36%. Among 27 cases of I-0, 13 were showed monophasic elevation of the ST segments or coronary T waves. Although a precise correlation between the size of each type of lesions and the grade of the Q and QS patterns was not confirmed, the small sized transmural lesions involving lateral or posterior wall and islands type of lesions failed to show the abnormal Q and QS patterns. It would seem difficult to make a correct diagnosis of myocardial infarction in about one third of the infarcted cases of the aged group, if diagnosis is based on only the abnormal Q and QS patterns.

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