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oai:uvadoc.uva.es:10324/34432025-03-26T19:10:04Zcom_10324_1138com_10324_931com_10324_894col_10324_1226

Venographic comparison of subcutaneous low-molecular weight heparin with oral anticoagulant therapy in the long-term treatment of deep venous thrombosis González Fajardo, José Antonio Arreba, Emilio Castrodeza Sanz, José Javier Pérez Castrillon, José Luis Fernández, Leopoldo Agundez, Ignacio Mateo, Antonio M. Carrera, Santiago Gutíerrez Alonso, Vicente Vaquero Puerta, Carlos Trombosis-Tratamiento Producción Científica Purpose: The primary objective of this study was to evaluate with venography the rate of thrombus regression after a fixed dose of low–molecular weight heparin (LMWH) per day for 3 months compared with oral anticoagulant therapy for deep venous thrombosis (DVT). Secondary endpoints were the comparisons of the efficacy and safety of both treatments. Methods: This study was designed as an open randomized clinical study in a university hospital setting. Of the 165 patients finally enrolled in the study, 85 were assigned LMWH therapy and 80 were assigned oral anticoagulant therapy. In the group randomized to oral anticoagulant therapy, the patients first underwent treatment in the hospital with standard unfractionated heparin and then coumarin for 3 months. Doses were adjusted with laboratory monitoring to maintain the international normalized ratio between 2.0 and 3.0. Patients in the LMWH group were administered subcutaneous injections of fixed doses of 40 mg enoxaparin (4000 anti-Xa units) every 12 hours for 7 days, and after discharge from the hospital, they were administered 40 mg enoxaparin once daily at fixed doses for 3 months without a laboratory control assay. A quantitative venographic score (Marder score) was used to assess the extent of the venous thrombosis, with 0 points indicating no DVT and 40 points indicating total occlusion of all deep veins. The rate of thrombus reduction was defined as the difference in quantitative venographic scores after termination of LMWH or coumarin therapy as compared with the scores obtained on the initial venographic results. The efficacy was defined as the ability to prevent symptomatic extension or recurrence of venous thromboembolism (documented with venograms or serial lung scans). The safety was defined as the occurrence of hemorrhages. Results: After 3 months of treatment, the mean Marder score was significantly decreased in both groups in comparison with the baseline score, although the effect of therapy was significantly better after LMWH therapy (49.4% reduction) than after coumarin therapy (24.5% reduction; P < .001). LMWH therapy and male gender were independently associated with an enhanced resolution of the thrombus. A lower frequency of symptomatic recurrent venous thromboembolism was also shown in patients who underwent treatment with LMWH therapy (9.5%) than with oral anticoagulant therapy (23.7%; P < .05), although this difference was entirely a result of recurrence of DVT. Bleeding complications were significantly fewer in the LMWH group than in the coumarin group (1.1% vs 10%; P < .05). This difference was caused by minor hemorrhages. Coumarin therapy and cancer were independently associated with an enhanced risk of complications. Subcutaneous heparin therapy was well tolerated by all patients. Conclusion: The patients who were allocated to undergo enoxaparin therapy had a significantly greater improvement in their quantitative venographic score, a significantly 2013-09-18T10:19:09Z 2013-09-18T10:19:09Z 1999 info:eu-repo/semantics/article Journal of Vascular Surgery, August, vol.30, n.2. p.283-292 0741-5214 http://uvadoc.uva.es/handle/10324/3443 10.1016/S0741-5214(99)70139-4 283 2 292 Journal of Vascular Surgery 30 eng Attribution-NonCommercial-NoDerivs 3.0 Unported info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/3.0/ application/pdf https://uvadoc.uva.es/bitstream/10324/3443/6/vaquero31.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by-nc-nd/3.0/ UVaDOC. Repositorio Documental de la Universidad de Valladolid http://uvadoc.uva.es/handle/10324/3443