title: Incidence and risk factors of thrombocytopenia in critically ill trauma patients.
abstract: OBJECTIVE
  To determine the incidence of thrombocytopenia (< 100 platelets x 10(3)/mm3) and potential risk factors, including medications, associated with the development of thrombocytopenia in critically ill trauma patients.
  
  
  METHODS
  Prospective, observational study.
  
  
  METHODS
  A 20-bed trauma intensive care unit (ICU) at a university hospital.
  
  
  METHODS
  Sixty-three critically ill trauma patients without baseline thrombocytopenia admitted to the trauma ICU for at least 48 hours.
  
  
  METHODS
  Patients were followed for up to 14 days. Platelet counts were determined daily. The following data were collected and analyzed as potential risk factors for the development of thrombocytopenia: medications, age, sex, race, trauma score, mode and type of injury, alcohol history, units of packed red blood cells (PRBC) and platelets transfused, surgical procedures, duration of ICU stay, and the development of systemic inflammatory response syndrome or disseminated intravascular coagulation.
  
  
  RESULTS
  Thrombocytopenia occurred in 26 (41%) of the patients. Among risk factors studied, nonhead injury, age, trauma score, duration of ICU stay, and the number of PRBC transfusions were significantly associated with the development of thrombocytopenia (p < 0.05). However, nonhead injury, age, and trauma score were useful variables in predicting the development of thrombocytopenia by using multivariate analysis. Medications were not associated with the development of thrombocytopenia.
  
  
  CONCLUSIONS
  The type of injury sustained, the quantity of platelet-deficient, transfusions, and age are the greatest risk factors associated with the development of thrombocytopenia in critically ill trauma patients. Drug-induced thrombocytopenia appears to play a minor role in the development of thrombocytopenia; therefore, medications should not be automatically discontinued or substituted when thrombocytopenia occurs.
authors.affiliation: Department of Clinical Pharmacy, University of Tennessee, Memphis, USA.
authors.forename: S D
authors.initials: SD
authors.lastname: Hanes
authors.forename: D A
authors.initials: DA
authors.lastname: Quarles
authors.forename: B A
authors.initials: BA
authors.lastname: Boucher
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D006259:Craniocerebral Trauma / Q000097:blood / Q000150:complications; D003422:Critical Care; D016638:Critical Illness; D005260:Female; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D013921:Thrombocytopenia / Q000453:epidemiology* / Q000209:etiology; D065227:Transfusion Reaction; D014947:Wounds and Injuries / Q000097:blood* / Q000150:complications