Prevention of venous thromboembolism in internal medicine with unfractionated or low-molecular-weight heparins: a meta-analysis of randomised clinical trials. 2000

P Mismetti, and S Laporte-Simitsidis, and B Tardy, and M Cucherat, and A Buchmüller, and D Juillard-Delsart, and H Decousus
Clinical Pharmacology Unit, University Hospital of Saint-Etienne, France. mismetti@univ-st-etienne.fr

BACKGROUND The prevention of venous thromboembolic disease is less studied in medical patients than in surgery. METHODS We performed a meta-analysis of randomised trials studying prophylactic unfractionated heparin (UFH) or low-molecular-weight heparin (LMWH) in internal medicine, excluding acute myocardial infarction or ischaemic stroke. Deep-vein thrombosis (DVT) systematically detected at the end of the treatment period, clinical pulmonary embolism (PE), death and major bleeding were recorded. RESULTS Seven trials comparing a prophylactic heparin treatment to a control (15,095 patients) were selected. A significant decrease in DVT and in clinical PE were observed with heparins as compared to control (risk reductions = 56% and 58% respectively, p <0.001 in both cases), without significant difference in the incidence of major bleedings or deaths. Nine trials comparing LMWH to UFH (4,669 patients) were also included. No significant effect was observed on either DVT, clinical PE or mortality. However LMWH reduced by 52% the risk of major haemorrhage (p = 0.049). CONCLUSIONS This meta-analysis, based on the pooling of data available for several heparins, shows that heparins are beneficial in the prevention of venous thromboembolism in internal medicine.

UI MeSH Term Description Entries
D006493 Heparin A highly acidic mucopolysaccharide formed of equal parts of sulfated D-glucosamine and D-glucuronic acid with sulfaminic bridges. The molecular weight ranges from six to twenty thousand. Heparin occurs in and is obtained from liver, lung, mast cells, etc., of vertebrates. Its function is unknown, but it is used to prevent blood clotting in vivo and vitro, in the form of many different salts. Heparinic Acid,alpha-Heparin,Heparin Sodium,Liquaemin,Sodium Heparin,Unfractionated Heparin,Heparin, Sodium,Heparin, Unfractionated,alpha Heparin
D006495 Heparin, Low-Molecular-Weight Heparin fractions with a molecular weight usually between 4000 and 6000 kD. These low-molecular-weight fractions are effective antithrombotic agents. Their administration reduces the risk of hemorrhage, they have a longer half-life, and their platelet interactions are reduced in comparison to unfractionated heparin. They also provide an effective prophylaxis against postoperative major pulmonary embolism. LMWH,Low-Molecular-Weight Heparin,Low Molecular Weight Heparin,Heparin, Low Molecular Weight
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D000925 Anticoagulants Agents that prevent BLOOD CLOTTING. Anticoagulant Agent,Anticoagulant Drug,Anticoagulant,Anticoagulant Agents,Anticoagulant Drugs,Anticoagulation Agents,Indirect Thrombin Inhibitors,Agent, Anticoagulant,Agents, Anticoagulant,Agents, Anticoagulation,Drug, Anticoagulant,Drugs, Anticoagulant,Inhibitors, Indirect Thrombin,Thrombin Inhibitors, Indirect
D016032 Randomized Controlled Trials as Topic Works about clinical trials that involve at least one test treatment and one control treatment, concurrent enrollment and follow-up of the test- and control-treated groups, and in which the treatments to be administered are selected by a random process, such as the use of a random-numbers table. Clinical Trials, Randomized,Controlled Clinical Trials, Randomized,Trials, Randomized Clinical
D016896 Treatment Outcome Evaluation undertaken to assess the results or consequences of management and procedures used in combating disease in order to determine the efficacy, effectiveness, safety, and practicability of these interventions in individual cases or series. Rehabilitation Outcome,Treatment Effectiveness,Clinical Effectiveness,Clinical Efficacy,Patient-Relevant Outcome,Treatment Efficacy,Effectiveness, Clinical,Effectiveness, Treatment,Efficacy, Clinical,Efficacy, Treatment,Outcome, Patient-Relevant,Outcome, Rehabilitation,Outcome, Treatment,Outcomes, Patient-Relevant,Patient Relevant Outcome,Patient-Relevant Outcomes
D020246 Venous Thrombosis The formation or presence of a blood clot (THROMBUS) within a vein. Deep Vein Thrombosis,Phlebothrombosis,Thrombosis, Deep Vein,Thrombosis, Venous,Deep Venous Thrombosis,Deep-Vein Thrombosis,Deep-Venous Thrombosis,Deep Vein Thromboses,Deep Venous Thromboses,Deep-Vein Thromboses,Deep-Venous Thromboses,Phlebothromboses,Thromboses, Deep Vein,Thromboses, Deep Venous,Thromboses, Deep-Vein,Thromboses, Deep-Venous,Thromboses, Venous,Thrombosis, Deep Venous,Thrombosis, Deep-Vein,Thrombosis, Deep-Venous,Vein Thromboses, Deep,Vein Thrombosis, Deep,Venous Thromboses,Venous Thromboses, Deep,Venous Thrombosis, Deep

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