Background Recent controlled trials suggest that thrombolytictherapy may be an effective initial treatment for acute arterialocclusion of the legs. A major potential benefit of initialthrombolytic therapy is that limb ischemia can be managed withless invasive interventions.
Methods In this randomized, multicenter trial conducted at 113North American and European sites, we compared vascular surgery(e.g., thrombectomy or bypass surgery) with thrombolysis bycatheter-directed intraarterial recombinant urokinase; all patients(272 per group) had had acute arterial obstruction of the legsfor 14 days or less. Infusions were limited to a period of 48hours (mean [±SE], 24.4±0.86), after which lesionswere corrected by surgery or angioplasty if needed. The primaryend point was the amputation-free survival rate at six months.
Results Final angiograms, which were available for 246 patientstreated with urokinase, revealed recanalization in 196 (79.7percent) and complete dissolution of thrombus in 167 (67.9 percent).Both treatment groups had similar significant improvements inmean anklebrachial blood-pressure index. Amputation-freesurvival rates in the urokinase group were 71.8 percent at sixmonths and 65.0 percent at one year, as compared with respectiverates of 74.8 percent and 69.9 percent in the surgery group;the 95 percent confidence intervals for the differences were-10.5 to 4.5 percentage points at six months (P = 0.43) and-12.9 to 3.1 percentage points at one year (P = 0.23). At sixmonths the surgery group had undergone 551 open operative procedures(excluding amputations), as compared with 315 in the thrombolysisgroup. Major hemorrhage occurred in 32 patients in the urokinasegroup (12.5 percent) as compared with 14 patients in the surgerygroup (5.5 percent) (P = 0.005). There were four episodes ofintracranial hemorrhage in the urokinase group (1.6 percent),one of which was fatal. By contrast, there were no episodesof intracranial hemorrhage in the surgery group.
Conclusions Despite its association with a higher frequencyof hemorrhagic complications, intraarterial infusion of urokinasereduced the need for open surgical procedures, with no significantlyincreased risk of amputation or death.
Source Information
From the Department of Surgery, University of Rochester School of Medicine and Dentistry, Rochester, N.Y. (K.O.); the Department of Surgery, Albert Einstein School of Medicine, Bronx, N.Y. (F.J.V.); and the Department of Medicine, Harvard Medical School, Boston (A.A.S.).
Address reprint requests to Dr. Ouriel at the Department of Surgery, University of Rochester, 601 Elmwood Ave., Rochester, NY 14642.
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