title: Antipsychotic drug use and the risk of venous thromboembolism in elderly patients.
abstract: OBJECTIVE
  Our aim was to investigate the relationship between exposure to antipsychotic drugs and the risk of venous thromboembolism (VTE) in elderly patients.
  
  
  METHODS
  A time-matched case-control analysis nested within a cohort of 111,818 patients with at least 1 antipsychotic drug prescription during 1998 to 2008. Data were used from the PHARMO institute's database, which contains drug dispensing data from community pharmacies and hospital admission data. The index date was for the cases defined as the date of hospital admission for VTE (deep venous thrombosis [DVT] or pulmonary embolism) or, for outpatient cases, the start of therapeutic dose low-molecular weight heparin therapy. For each case, 4 controls matched by age and sex were randomly sampled from the cohort.
  
  
  METHODS
  Two measures were used to evaluate the temporal relationship between antipsychotic drug use and the occurrence of VTE: being a current, recent, or past user and the duration of use up to the index date. The strength of the association was expressed as odds ratios with 95% confidence intervals, taking into account potential confounders.
  
  
  RESULTS
  We identified 367 cases of hospital admission for DVT, 342 cases of hospital admission for PE, and 323 cases of outpatient treatment of DVT. Current exposure to antipsychotic drugs was not associated with an increased risk of VTE, compared with nonusers (odds ratio, 0.9; 95% confidence interval, 0.7-1.1). We found no association between dosage, the duration of use, or the type of antipsychotic drug and the risk of VTE.
  
  
  CONCLUSIONS
  We found no evidence of an increased risk of VTE in elderly patients using antipsychotic drugs.
authors.affiliation: GeriMedica Medical Practice for Frail Elderly, Aveant Utrecht, The Netherlands.
authors.forename: Bart C
authors.initials: BC
authors.lastname: Kleijer
authors.forename: Eibert R
authors.initials: ER
authors.lastname: Heerdink
authors.forename: Toine C G
authors.initials: TC
authors.lastname: Egberts
authors.forename: Paul A F
authors.initials: PA
authors.lastname: Jansen
authors.forename: Rob J
authors.initials: RJ
authors.lastname: van Marum
mesh_terms: D000367:Age Factors; D000368:Aged; D000369:Aged, 80 and over; D014150:Antipsychotic Agents / Q000009:adverse effects*; D016022:Case-Control Studies; D015331:Cohort Studies; D005260:Female; D006760:Hospitalization / Q000639:trends; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D054556:Venous Thromboembolism / Q000139:chemically induced / Q000453:epidemiology*
chemical_list: D014150:Antipsychotic Agents