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ARTICLES

In vivo thrombin inhibition enhances and sustains arterial recanalization with recombinant tissue-type plasminogen activator.

I K Jang, H K Gold, R C Leinbach, J T Fallon, D Collen
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https://doi.org/10.1161/01.RES.67.6.1552
Circulation Research. 1990;67:1552-1561
Originally published December 1, 1990
I K Jang
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H K Gold
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R C Leinbach
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J T Fallon
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D Collen
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Abstract

The effects of heparin and the synthetic competitive thrombin inhibitor (2R,4R)-4-methyl-1-[N2-(3-methyl-1,2,3,4-tetrahydro-8-quinolinesulfon yl)-L-arginyl]-2-piperidinecarboxylic acid monohydrate (Argatroban) on thrombolysis with recombinant tissue-type plasminogen activator (rt-PA) was studied in groups of six or seven rabbits with arterial thrombosis. The model consisted of a whole-blood clot produced in a 1-cm isolated femoral arterial segment with superimposed endothelial damage and distal high-grade stenosis. rt-PA was injected as an intravenous bolus of 0.45 mg/kg body wt at 15-minute intervals until recanalization, or up to a maximum of four boluses. In seven rabbits given an intravenous injection of 17 mg/kg aspirin, rt-PA induced transient reflow in only one animal. In seven rabbits that received intravenous heparin (200 units/kg over 60 minutes), rt-PA administration produced reflow in five animals, which was persistent in two rabbits. Combined administration of aspirin and heparin in seven rabbits was associated with similar rt-PA-induced recanalization. rt-PA administration in six rabbits given intravenous Argatroban (100 micrograms/kg/min for 60 minutes) caused recanalization in five, with persistent patency in three. In six rabbits given aspirin and Argatroban, rt-PA caused recanalization in all, with persistent patency in five animals. Reflow occurred significantly more rapidly with Argatroban (14 +/- 7 minutes) than with heparin (35 +/- 11 minutes), reflow was obtained with fewer boluses of rt-PA in combination with Argatroban (median value of one bolus) than with heparin (median value, three boluses), and reocclusion after reflow was less frequent with Argatroban (0 of 11 versus 5 of 10 rabbits). Furthermore, the degree of thrombolysis determined by pathological analysis was significantly more extensive with Argatroban than with heparin, and patency persisted during a 3-hour observation period, despite elimination of Argatroban from the circulation. Thus, Argatroban, relative to heparin, enhances and sustains thrombolysis with rt-PA. It may offer promise as an adjunctive agent for thrombolytic therapy of arterial thrombosis.

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Circulation Research
December 1, 1990, Volume 67, Issue 6
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    In vivo thrombin inhibition enhances and sustains arterial recanalization with recombinant tissue-type plasminogen activator.
    I K Jang, H K Gold, R C Leinbach, J T Fallon and D Collen
    Circulation Research. 1990;67:1552-1561, originally published December 1, 1990
    https://doi.org/10.1161/01.RES.67.6.1552

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    In vivo thrombin inhibition enhances and sustains arterial recanalization with recombinant tissue-type plasminogen activator.
    I K Jang, H K Gold, R C Leinbach, J T Fallon and D Collen
    Circulation Research. 1990;67:1552-1561, originally published December 1, 1990
    https://doi.org/10.1161/01.RES.67.6.1552
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