title: Should low-molecular-weight heparins replace unfractionated heparin as the agent of choice for adults with deep venous thrombosis?
abstract: BACKGROUND
  Several low-molecular-weight heparins (LMWHs) are now approved for use in the United States for the prophylaxis of venous thromboembolism. They are used in Europe for the treatment of deep venous thrombosis (DVT) and pulmonary embolism. This review examines the evidence addressing the question "Should LMWHs replace unfractionated heparin (UFH) in the treatment of adults with DVT?"
  
  
  METHODS
  We performed a MEDLINE search using the key words "low-molecular-weight heparin" from the years 1990 to 1998, and the results were assessed using the JAMA Users' Guides to the Medical Literature system.
  
  
  RESULTS
  Low-molecular-weight heparins are at least as safe and effective as unfractionated heparin in the treatment of patients with DVT. They are probably more effective and safer. They are more convenient to use and are associated with lower overall costs.
  
  
  CONCLUSIONS
  Based on efficacy, safety, convenience, and cost, LMWHs are clearly superior to UFH in the treatment of DVT in primary care. Studies that confirm an expected improvement in patient-oriented outcomes (e.g., mortality and quality of life) need to be done.
authors.affiliation: University of Tennessee Medical Center, Knoxville, USA. dbrewer2@UTK.edu
authors.forename: D
authors.initials: D
authors.lastname: Brewer
mesh_terms: D000328:Adult; D019317:Evidence-Based Medicine; D017048:Health Care Costs; D006493:Heparin / Q000191:economics / Q000627:therapeutic use*; D006495:Heparin, Low-Molecular-Weight / Q000191:economics / Q000627:therapeutic use*; D006801:Humans; D012008:Recurrence; D013924:Thrombophlebitis / Q000188:drug therapy* / Q000191:economics / Q000517:prevention & control
chemical_list: D006495:Heparin, Low-Molecular-Weight; D006493:Heparin