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Original Article
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Volume 338:1105-1111 April 16, 1998 Number 16
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A Comparison of Recombinant Urokinase with Vascular Surgery as Initial Treatment for Acute Arterial Occlusion of the Legs
Kenneth Ouriel, M.D., Frank J. Veith, M.D., Arthur A. Sasahara, M.D., for The Thrombolysis or Peripheral Arterial Surgery (TOPAS) Investigators

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ABSTRACT

Background Recent controlled trials suggest that thrombolytic therapy may be an effective initial treatment for acute arterial occlusion of the legs. A major potential benefit of initial thrombolytic therapy is that limb ischemia can be managed with less invasive interventions.

Methods In this randomized, multicenter trial conducted at 113 North American and European sites, we compared vascular surgery (e.g., thrombectomy or bypass surgery) with thrombolysis by catheter-directed intraarterial recombinant urokinase; all patients (272 per group) had had acute arterial obstruction of the legs for 14 days or less. Infusions were limited to a period of 48 hours (mean [±SE], 24.4±0.86), after which lesions were corrected by surgery or angioplasty if needed. The primary end point was the amputation-free survival rate at six months.

Results Final angiograms, which were available for 246 patients treated with urokinase, revealed recanalization in 196 (79.7 percent) and complete dissolution of thrombus in 167 (67.9 percent). Both treatment groups had similar significant improvements in mean ankle–brachial blood-pressure index. Amputation-free survival rates in the urokinase group were 71.8 percent at six months and 65.0 percent at one year, as compared with respective rates 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 six months the surgery group had undergone 551 open operative procedures (excluding amputations), as compared with 315 in the thrombolysis group. Major hemorrhage occurred in 32 patients in the urokinase group (12.5 percent) as compared with 14 patients in the surgery group (5.5 percent) (P = 0.005). There were four episodes of intracranial hemorrhage in the urokinase group (1.6 percent), one of which was fatal. By contrast, there were no episodes of intracranial hemorrhage in the surgery group.

Conclusions Despite its association with a higher frequency of hemorrhagic complications, intraarterial infusion of urokinase reduced the need for open surgical procedures, with no significantly increased 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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Related Letters:

A Comparison of Recombinant Urokinase with Vascular Surgery for Acute Arterial Occlusion of the Legs
Zarins C. K., Gurewich V., Ouriel K., Porter J. M.
Extract | Full Text  
N Engl J Med 1998; 339:564-565, Aug 20, 1998. Correspondence

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