Estimating Myocardial Infarction Size With a Simple Electrocardiographic Marker Score

The earliest electrocardiographic evidence of myocardial infarction.

The earliest cardiograms recorded in 150 episodes of slight or subacute infarction have been analysed. In only 27 (I8%) did the tracing show a pattern regarded as diagnostic of acute infarction, i.e. localized ST elevation of I mm. or more. A further 72 (48%) showed a major abnormality of coronary type not diagnostic of recent infarction. Ten showed a pattern of left ventricular hypertrophy. In...

Electrocardiographic effects of experimental nontransmural myocardial infarction.

Clinical and experimental data have documented the ability of nontransmural myocardial infarction to produce abnormal Q waves on both the epicardial and body surfaces. We undertook this study to define the anatomic determinants of such Q wave development. Thirty dogs were studied before and after occlusion-reperfusion (26 dogs) or latex embolization (four dogs) of the left circumflex coronary a...

Electrocardiographic abnormality of pure posterior myocardial infarction.

Electrocardiographic Precordial Mapping in Anterior Myocardial Infarction

Serial 72-point precordial mapping of the ECG has been recorded to describe the natural history of changes in the precordial areas of ST segment elevation and the development of Q waves in 51 patients with acute uncomplicated anterior myocardial infarction. Eight patients have been studied in the same way but received 25 mg/kg of methylprednisolone sodium succinate as a single intravenous injec...

Postural electrocardiographic changes in healed myocardial infarction.

An electrocardiographic study of 110 patients with old myocardial infaretion was made. Chan.Ige of posture, by causing rotation of the heart on its axes, frequently altered the evidence of infarction. These changes were most evident in posterior infarction. The "labele(l" area (lid the following with respect to the exploring electrode: (1) disappeared, (2) if absent in the supine posture, the e...