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[t-PA activity, antigen and PAI-1 antigen levels in blood obtained from the patients with cerebral infarction].

Tissue plasminogen activator (t-PA) produced by endothelial cells exerts a powerful effect on the course of thrombosis, embolism, or arteriosclerosis. However, the fluctuations of fibrinolytic system in the patients with cerebral infarction (CI), have yet to be demonstrated. This study was designed to investigate t-PA activity, t-PA antigen and plasminogen activator inhibitor-1 (PAI-1) antigen levels in the CI patients. The mean t-PA activity, t-PA antigen and PAI-1 levels in patients were 0.53 +/- 0.64 IU/ml, 10.9 +/- 5.2 ng/ml and 23.0 +/- 14.9 ng/ml, and the normal ranges were 0.02-0.28 IU/ml, 1.0-7.0 ng/ml and 5.3-45.0 ng/ml, respectively. Almost all the patients were plotted out to the abnormal range by scattergrams relating t-PA activity to t-PA antigen, and no daytime fluctuations of the above three parameters in the patients differed from those in normal controls. When CI patients were followed up to the 8th hospital day, abnormal fluctuations were also observed. Consequently we suggest that this information may help to attain the more progressive treatment or the preventive therapy of CI.