title: Clopidogrel in a pediatric population: prescribing practice and outcomes from a single center.
abstract: BACKGROUND
  This study aimed to provide descriptive information about off-label treatment practice with clopidogrel in a pediatric population.
  
  
  METHODS
  Patients less than 18 years of age prescribed clopidogrel between March 2002 and August 2005 were retrospectively identified at Children's Hospital, Boston. Data from the time of first documented clopidogrel use to the most recent follow-up assessment were collected. Adverse events were classified according to seriousness and relationship to clopidogrel.
  
  
  RESULTS
  Of the 90 patients in the study, 53% were boys. The median age of the patients was 6.7 years, and their median weight was 23.6 kg at first clopidogrel use. Prescriptions were predominantly for cardiac indications (96%), with a few for neurologic indications (4%). Common cardiac indications were history of thrombosis involving a conduit or shunt, abnormal vasculature with potential for low flow, and device placement. The median total dose was 1.3 mg/kg/day, and the duration of therapy varied from less than 1 day to 4 years (median, 45 days). Three patients experienced minor bleeding, all of whom were receiving concomitant acetylsalicylic acid. Another patient experienced catastrophic bleeding after vessel tear during catheterization. One patient with a fenestrated Fontan and poor ventricular function had baffle thrombosis and subsequent stroke while receiving clopidogrel and acetylsalicylic acid.
  
  
  CONCLUSIONS
  Clopidogrel was prescribed most often to prevent thrombosis in patients with cardiac disease. Patients with neurologic conditions also were treated. Bruising and bleeding events occurred rarely.
authors.affiliation: Department of Cardiology, Children's Hospital Boston, 300 Longwood Avenue, Boston, MA 02115, USA.
authors.forename: Lily A
authors.initials: LA
authors.lastname: Maltz
authors.forename: Kimberlee
authors.initials: K
authors.lastname: Gauvreau
authors.forename: Jean A
authors.initials: JA
authors.lastname: Connor
authors.forename: Kathy J
authors.initials: KJ
authors.lastname: Jenkins
mesh_terms: D000293:Adolescent; D002648:Child; D002669:Child Welfare; D002675:Child, Preschool; D000077144:Clopidogrel; D003328:Coronary Thrombosis / Q000188:drug therapy* / Q000209:etiology / Q000517:prevention & control; D011307:Drug Prescriptions / Q000706:statistics & numerical data*; D005260:Female; D006330:Heart Defects, Congenital / Q000150:complications*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D010975:Platelet Aggregation Inhibitors / Q000009:adverse effects / Q000627:therapeutic use*; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data*; D012189:Retrospective Studies; D013988:Ticlopidine / Q000009:adverse effects / Q000031:analogs & derivatives* / Q000627:therapeutic use; D016896:Treatment Outcome
chemical_list: D010975:Platelet Aggregation Inhibitors; D000077144:Clopidogrel; D013988:Ticlopidine
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