PMID: 2123152Dec 1, 1990Paper

A randomized trial of a single bolus dosage regimen of recombinant tissue plasminogen activator in patients with acute pulmonary embolism

Chest
M N LevineM Gent

Abstract

Experiments in animals have demonstrated that recombinant tissue plasminogen activator (rt-PA) produces continuing thrombolysis after it is cleared from the circulation and that thrombolysis is both increased and accelerated, and bleeding is reduced when rt-PA is administered over a short period. In previous studies in patients with thrombotic disease, rt-PA has been shown to be an effective thrombolytic agent when administered by continuous infusion over a period between 90 minutes and 8 hours. To determine whether a short course regimen of rt-PA can achieve thrombolysis, a double-blind randomized trial has been conducted in which patients with objectively established acute symptomatic pulmonary embolism who were receiving heparin were allocated to either a 2-minute infusion of rt-PA at a dose of 0.6 mg/kg (33 patients) or saline placebo (25 patients). Perfusion lung scanning was used to assess the change in pulmonary perfusion at 24 hours and seven days post-study drug administration. Thirty-four percent of the rt-PA patients had a greater than 50 percent resolution in the perfusion defect at 24 hours compared to 12 percent of placebo patients (p = 0.026). At 24 hours, the mean relative improvement in the perfusion defect was...Continue Reading

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