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(Chest. 1966;50:113-119.)
© 1966 American College of Chest Physicians

The Morphology of the ST-T Loop in Healed Myocardial Infarction

Agustin Castellanos Jr. M.D.1; Louis Lemberg M.D., F.C.C.P.2; Louis Salhanick M.D.3; and Antonio Gomez 4

1 Assistant Professor of Medicine, University of Miami School of Medicine
2 Associate Professor of Medicine, University of Miami School of Medicine
3 Instructor of Medicine, University of Miami School of Medicine
4 Jackson Memorial Hospital

The morphology of the enlarged ST-T loop (1 mv=5 or 10 inches) was studied in 38 patients with chronic myocardial infarction. Spatial repolarization was normal by standard vectorcardiographic criteria in six cases. In 16, the T loop was located in an abnormal position. Fourteen of the latter cases showed divergence between QRS and T loop rotation. This could represent one form of repolarization conduction defect.

An ischemic ST-T loop characterized by a more or less uniform speed of inscription of its afferent and efferent portions was seen in six cases. Eight patients showed an abnormal, low, length-to-width ratio, resulting in a circular ST-T loop. The terminal portions of repolarization could be inscribed as slowly as the efferent loop in these cases. This specific type of abnormality could well be another type of repolarization conduction defect.






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Copyright © 1966 by the American College of Chest Physicians.