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Plasminogen-activator of the arterial wall in occluded arteries.

The plasminogen activator in 117 specimen of 20 coronary and 29 pulmonary arteries occluded completely by thrombi or emboli within the adventitia and intima was studied using TODD's histochemical method. 39 cadavers were used, 1--18 hours post mortem from subjects aged from 45 to 88 years. In occluded arteries both coronary and pulmonary the plasminogen activator activity was decreased in comparison with normal and atherosclerotic patients. In coronary and pulmonary arterial thrombi a low grade focal activity of plasminogen activator was detected. It is assumed that the decrease of plasminogen activator in the occluded human arterial wall is due to the impaired oxygen supply of the vessel wall and to the consumption of the plasminogen activator for thrombus lysis. These mechanisms are likely to influence the plasminogen activator for a certain and prolonged time, since there were no changes of fibrinolysis within the vessel wall of arteria carotis in rats where an acute thrombosis was elicited by means of an electric current.