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- W2063635621 abstract "BACKGROUND Despite the utility of tissue-type plasminogen activator (t-PA) in eliciting coronary thrombolysis clinically, early reocclusion remains a problem, occurring despite anticoagulation in 5-30% of patients with initially successful recanalization. This study evaluated the utility of Hybrid-B, a molecular variant of t-PA with a prolonged half-life in the circulation, in eliciting coronary thrombolysis and maintaining patency in the presence of a continuing thrombogenic stimulus. METHODS AND RESULTS In intact, anesthetized dogs, either 18 mg Hybrid-B over 30 minutes (n = 15) or 50 mg t-PA (Activase) over 60 minutes (n = 8) was administered starting 60 minutes after left anterior descending coronary artery occlusion was induced with a thrombogenic copper coil. Time to lysis averaged 54 +/- 26 (means +/- SD) minutes and 64 +/- 34 minutes with Hybrid-B and t-PA, respectively (p = NS). When Hybrid-B was administered as a bolus (20 mg over 1 minute) to induce a high initial concentration in blood, time to lysis was shortened markedly and averaged 15 +/- 5 minutes. Dogs given Hybrid-B by either infusion or bolus exhibited prolonged time to reocclusion (337 +/- 192 minutes compared with 192 +/- 125 minutes in dogs given t-PA, p less than 0.03), reflecting maintenance of a subthrombolytic but persistently active concentration of activator in blood. Despite the persistence of Hybrid-B in blood, concentrations of fibrinogen and alpha 2-antiplasmin were not depleted markedly and remained at 77 +/- 25 and 56 +/- 24%, respectively, of control values. CONCLUSIONS Thus, Hybrid-B, a novel variant of t-PA with unique pharmacokinetic properties, elicits prompt, sustained, and clot-selective coronary thrombolysis." @default.
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- W2063635621 date "1991-04-01" @default.
- W2063635621 modified "2023-09-26" @default.
- W2063635621 title "Induction of sustained patency after clot-selective coronary thrombolysis with Hybrid-B, a genetically engineered plasminogen activator with a prolonged biological half-life." @default.
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- W2063635621 doi "https://doi.org/10.1161/01.cir.83.4.1429" @default.
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