Circulation, Vol 57, 1074-1077, Copyright © 1978 by American Heart Association
PJ Schwartz and S Wolf
Fifty-five patients with recent myocardial infarction and 55 healthy
controls, matched for age, sex, race, height, weight, education and job,
had an electrocardiogram taken every two months for seven years.
Twenty-eight patients and one control had a sudden cardiac death. The QTc
(mean of all values recorded) was found prolonged in one control (2%), five
of 27 surviving patients (18%) and in 16 of 28 patients who had sudden
death (57%). The difference between surviving and sudden death patients is
significant (P less than 0.01). It is interesting that the only control
with a long QT was the one when died suddenly of myocardial infarction.
Among patients with previous myocardial infarction a prolonged QTc
constitutes a 2.16 times greater risk for sudden death. We conclude that a
constant prolongation of QTc in patients with myocardial infarction may
help, with other risk factors, in defining a subgroup at higher risk for
sudden death.
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