title: Incidence and time course of asymptomatic deep vein thrombosis with fondaparinux in patients undergoing total joint arthroplasty.
abstract: BACKGROUND
  There are many reports concerning fondaparinux prophylaxis of asymptomatic deep vein thrombosis (DVT) after total hip arthroplasty (THA) or total knee arthroplasty (TKA), but little is known about the time course of aymptomatic DVT development during the administration of fondaparinux. The aim of the present study was to define the incidence and time course of aymptomatic DVT development during administration of fondaparinux, and to assess the efficacy of fondaparinux in resolving DVT.
  
  
  METHODS
  We studied consecutive 71 patients who underwent THA surgery, and 30 patients who underwent TKA surgery with fondaparinux prophylaxis. Patients received once-daily subcutaneous injections of 2.5mg of fondaparinux for 14 days after surgery. DVT was diagnosed by ultrasonography, and it was scheduled on the day of surgery on day 1, day 4, and day 14 after surgery.
  
  
  RESULTS
  In patients who received fondaparinux for 14 days after THA surgery, the incidence of DVT was 0% on the day of the surgery, 13.6% at day 1, 27.1% at day 4, and 11.9% at day 14. In patients who received fondaparinux for 14 days after TKA surgery, the incidence of DVT was 4.2% on the day after surgery, 50.0% at day 1, 58.3% at day 4, and 20.8% at day 14. The incidence of DVT after THA or TKA surgery at day 14 was significantly reduced compared to that at day 4.
  
  
  CONCLUSIONS
  The incidence of asymptomatic DVT up to day 4 was high, but with 14 days continued treatment of fondaparinux, the incidence of asymptomatic DVT occurring at postoperative day 4 was significantly reduced at day 14.
authors.affiliation: Department of Orthopaedic Surgery, Mie University Graduate School of medicine, 2-174 Edobashi, Tsu City, Mie 514-8507, Japan.
authors.forename: Toshio
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Rui
authors.initials: R
authors.lastname: Niimi
authors.forename: Akihiro
authors.initials: A
authors.lastname: Sudo
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000925:Anticoagulants / Q000627:therapeutic use*; D019644:Arthroplasty, Replacement, Hip / Q000009:adverse effects*; D005260:Female; D000077425:Fondaparinux; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D011134:Polysaccharides / Q000627:therapeutic use*; D014463:Ultrasonography; D020246:Venous Thrombosis / Q000000981:diagnostic imaging / Q000453:epidemiology* / Q000209:etiology / Q000517:prevention & control*
chemical_list: D000925:Anticoagulants; D011134:Polysaccharides; D000077425:Fondaparinux