Increased plasma endothelin-1 in the early hours of acute myocardial infarction

McGill Unit, Department of Medicine, McGill University, Montreal, Quebec, Canada.

Endothelin is a novel endothelium-derived vasoactive peptide with potent vasoconstrictor action in the coronary bed; however, its possible contribution to myocardial ischemia and infarction is not known. Plasma endothelin-1 concentration was measured with use of a radioimmunoassay in serial venous samples from 22 patients over a 72 h period after acute myocardial infarction (14 patients with uncomplicated infarction [group I] and 8 patients with hemodynamic or ischemic sequelae [group II]). Twenty-two normal subjects and seven patients with stable angina served as the control subjects. Endothelin-1 levels in patients with stable coronary disease were not different from those of normal subjects (0.62 +/- 0.56 and 0.76 +/- 0.38 pg/ml, respectively). In group I, plasma levels of endothelin-1 rose sharply after myocardial infarction, reaching a peak of 4.95 +/- 0.78 pg/ml at 6 h after the onset of chest pain (p less than 0.05 compared with values in control subjects) and returning rapidly toward the normal range by 24 h. Patients with complicated infarction (group II) demonstrated a similar rapid increase in plasma endothelin-1 to a peak value of 8.29 +/- 1.95 pg/ml; however, plasma endothelin-1 remained elevated in these patients, becoming significantly different from values in group I at 48 and 72 h. There was no correlation between peak increases in creatine kinase and peak endothelin-1 in either group, suggesting that the stimulus for elevation of endothelin-1 was not myocardial necrosis itself. Furthermore, left ventricular ejection fraction did not correlate with the increase in endothelin-1 in group I patients, whereas there was a significant inverse relation between ventricular function and plasma endothelin-1 in group II.(ABSTRACT TRUNCATED AT 250 WORDS)

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