Plasma tissue plasminogen activator inhibitor levels in coronary artery disease: correlation with age and serum triglyceride concentrations

Increased levels of an endogenous inhibitor of tissue-plasminogen activator (t-PA) have been thought to relate to the genesis of acute myocardial ischemia. To examine the role of the rapid inhibitor of t-PA, plasma samples were analyzed from 75 patients with chest pain syndrome undergoing coronary angiography (mean age 57 years), 24 patients with clinically documented coronary artery disease (unstable angina, positive exercise stress test or previous history of myocardial infarction; mean age 58 years) and 15 young normal subjects (mean age 26 years). Plasma t-PA inhibitor levels were similar in age-matched patients regardless of the absence or presence (and degree) of coronary artery disease. Plasma t-PA inhibitor levels correlated significantly with age (r - 0.46, p less than 0.005), suggesting an age-dependent decrease in fibrinolytic activity. Plasma t-PA inhibitor levels also correlated significantly with serum triglyceride levels (r - 0.60, p less than 0.001), but not with coronary risk factors such as serum cholesterol, diabetes, hypertension, serum uric acid levels or body weight. Association of high levels of inhibitor of t-PA with hypertriglyceridemia may be of importance in the development of coronary thrombosis, especially in elderly patients. Nonetheless, this study does not suggest a pathogenic role of t-PA inhibitor in coronary atherosclerosis.

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