Abstract
A canine model was developed to investigate coronary artery thrombolysis and reocclusion in the setting of endothelial cell damage and fixed stenosis, which simulate anatomic features occurring in patients with acute myocardial infarction. In open chest dogs, endothelial cell damage was produced in the left anterior descending coronary artery by external compression with blunt forceps, greater than 90% stenosis was obtained by an external constrictor and thrombosis was induced by instillation of thrombin and fresh blood in an isolated arterial segment. In the absence of stenosis, intravenous infusion of 750,000 U of streptokinase over 1 h caused reperfusion in five of six dogs in 34 +/- 25 min (mean +/- SD). Urokinase, 600,000 U intravenously over 30 min followed by 600,000 U over 30 min by the intracoronary route, induced reperfusion in three of four dogs in 65 +/- 23 min. Recombinant two chain tissue-type plasminogen activator (rt-PA) (G11021), infused intravenously at a rate of 15 micrograms/kg per min for 30 min or until reflow, induced reperfusion in all 12 dogs in 28 +/- 13 min. In the absence of coronary artery stenosis, spontaneous reocclusion did not occur within 2 h after the end of the infusion. In the presence of th...Continue Reading
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