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Original Article
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Volume 337:663-669 September 4, 1997 Number 10
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A Comparison of Low-Molecular-Weight Heparin with Unfractionated Heparin for Acute Pulmonary Embolism
Gérald Simonneau, M.D., Hervé Sors, M.D., Bernard Charbonnier, M.D., Yves Page, M.D., Jean-Pierre Laaban, M.D., Réza Azarian, M.D., Marcel Laurent, M.D., Jean-Lou Hirsch, M.D., Emile Ferrari, M.D., Jean-Luc Bosson, M.D., Dominique Mottier, M.D., Bertrand Beau, M.D., for The Thésée Study Group

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ABSTRACT

Background Low-molecular-weight heparin appears to be at least as effective and safe as standard, unfractionated heparin for the treatment of deep-vein thrombosis, but only limited data are available on the use of low-molecular-weight heparin to treat acute symptomatic pulmonary embolism.

Methods We randomly assigned 612 patients with symptomatic pulmonary embolism who did not require thrombolytic therapy or embolectomy to either subcutaneous low-molecular-weight heparin (tinzaparin) given once daily in a fixed dose or adjusted-dose, intravenous unfractionated heparin. Oral anticoagulant therapy was begun between the first and the third day and was given for at least three months. We compared the treatments at day 8 and day 90 with respect to a combined end point of recurrent thromboembolism, major bleeding, and death.

Results In the first eight days of treatment, 9 of 308 patients assigned to receive unfractionated heparin (2.9 percent) reached at least one of the end points, as compared with 9 of 304 patients assigned to low-molecular-weight heparin (3.0 percent; absolute difference, 0.1 percentage point; 95 percent confidence interval, -2.7 to 2.6). By day 90, 22 patients assigned to unfractionated heparin (7.1 percent) and 18 patients assigned to low-molecular-weight heparin (5.9 percent) had reached at least one end point (P = 0.54; absolute difference, 1.2 percentage points; 95 percent confidence interval, -2.7 to 5.1). The risk of major bleeding was similar in the two treatment groups throughout the study.

Conclusions Under the conditions of this study, initial subcutaneous therapy with the low-molecular-weight heparin tinzaparin appeared to be as effective and safe as intravenous unfractionated heparin in patients with acute pulmonary embolism.


Source Information

From Hôpital Antoine Béclère, Clamart (G.S.); Hôpital Laennec, Paris (H.S.); Hôpital Trousseau, Tours (B.C.); Hôpital Bellevue, St. Etienne (Y.P.); Hôpital Hôtel Dieu, Paris (J.-P.L.); Hôpital André Mignot, Versailles (R.A.); Hôpital Hôtel Dieu, Rennes (M.L.); Hôpital Henri Duffaut, Avignon (J.-L.H.); Hôpital Pasteur, Nice (E.F.); Hôpital Universitaire, Grenoble (J.-L.B.); Hôpital de la Cavale Blanche, Brest (D.M.); and Leo Pharmaceuticals, St. Quentin en Yvelines (B.B.) — all in France.

Address reprint requests to Dr. Simonneau at the Service de Pneumologie et Réanimation, Hôpital Antoine Béclère, 157 rue de la Porte de Trivaux, 92141 Clamart, France.

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