Copyright © 2001 by the European Society of Cardiology.
A synthetic factor-Xa inhibitor (ORG31540/SR9017A) as an adjunct to fibrinolysis in acute myocardial infarction. The PENTALYSE study
a University Hospital Gasthuisberg, Leuven, Belgium
b Hôpital Saint-Jacques, Besançon, France
c A.Z. Middelheim, Antwerpen, Belgium
d Z.O.L. Campus St. Jan, Genk, Belgium
e C.H.R. de la Citadelle, Liège, Belgium
f C.H.U. De Caen, Caen, France
g Catharina Ziekenhuis, Eindhoven, The Netherlands
h Hôpital Tenon, Paris, France
i Imelda Ziekenhuis, Bonheiden, Belgium
j Medizinische Klinik III, Mainz, Germany
revised April 24, 2001; accepted April 25, 2001
Abstract
Background ORG31540/SR90107A, a synthetic pentasaccharide, is a selective inhibitor of factor-Xa. It was hypothesized that prolonged factor-Xa inhibition with pentasaccharide may be an effective and safe antithrombotic co-therapy in acute myocardial infarction.
Methods and Results Patients (n=333) with evolving ST-segment elevation acute myocardial infarction were treated with aspirin and alteplase and randomized to unfractionated heparin, given intravenously during 48 to 72h, or to a low, medium or high dose of pentasaccharide, administered daily for 5 to 7 days, intravenously on the first day, then subcutaneously. Coronary angiography was performed at 90min and on days 5 to 7. Thrombolysis in Myocardial Infarction (TIMI) flow grade 3 rates at 90min were similar in the four treatment groups. Among patients with TIMI 3 flow at 90min and who did not undergo a coronary intervention (n=155), a trend towards less reocclusion of the infarct-related vessel on days 5 to 7 was observed with pentasaccharide: 0·9% vs 7·0% with unfractionated heparin (P=0·065). Also, fewer revascularizations during the 30-day follow-up period were performed in patients given pentasaccharide (39% vs 51% for unfractionated heparin;P=0·054). The primary safety end-point, the combined incidence of intracranial haemorrhage and need for blood transfusion, was identical with pentasaccharide and unfractionated heparin (7·1%). One non-fatal intracranial haemorrhage occurred in the 241 patients given pentasaccharide (0·4%).
Conclusions In this study, pentasaccharide given together with alteplase was safe and as effective as unfractionated heparin in restoring coronary artery patency. Prolonged administration of pentasaccharide was associated with a trend towards less reocclusion and fewer revascularizations. Selective factor-Xa-inhibition seems to be an attractive therapeutic concept in patients presenting with ST-segment elevation acute myocardial infarction.
Key Words: Fibrinolysis, heparin, myocardial infarction, reperfusion
f1 Correspondence: Frans Van de Werf, MD, PhD, Chairman, Department of Cardiology, U.Z. Gasthuisberg, University of Leuven, Herestraat 49, B-3000 Leuven, Belgium.
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