title: Use of thrombolysis in acute ischemic stroke: analysis of the Nationwide Inpatient Sample 1999 to 2004.
abstract: OBJECTIVE
  The aim of this study is to characterize hospital and patient characteristics associated with administration of thrombolysis in acute ischemic stroke patients in the United States.
  
  
  METHODS
  This retrospective, observational, cohort study used data from the Nationwide Inpatient Sample, an administrative discharge database. A total of 366,194 hospitalizations admitted through the emergency department with a primary diagnosis of acute ischemic stroke were selected for analysis. The primary outcome considered in this study is whether the patient received thrombolytic therapy on hospital day 0 or 1.
  
  
  RESULTS
  Thrombolysis was used in 1.12% (95% confidence interval [CI] 0.95% to 1.32%) of ischemic stroke hospitalizations. Most hospitals (69.5%; 95% CI 68.4% to 70.6%) treating ischemic stroke patients did not use thrombolysis during the study period. For the hospitals that used thrombolysis, the mean annual number of patients treated with thrombolysis per hospital was 3.06 (95% CI 2.68 to 3.44). In the binary logistic regression analysis, hospital characteristics associated with high use of thrombolysis were teaching hospital status and increasing number of stroke patients treated annually. Patient characteristics associated with higher use of thrombolysis were age younger than 55 years, male sex, and low comorbidity as measured by the modified Charlson Index; white race; and private self-pay health insurance.
  
  
  CONCLUSIONS
  Use of thrombolysis for ischemic stroke in the United States from 1999 to 2004 was infrequent and showed significant differences, depending on hospital and patient demographic characteristics.
authors.affiliation: Doris and Stanley Tananbaum Stroke Center, Neurological Institute, New York-Presbyterian Hospital, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA. hs775@columbia.edu
authors.forename: H Christian
authors.initials: HC
authors.lastname: Schumacher
authors.forename: Brian T
authors.initials: BT
authors.lastname: Bateman
authors.forename: Bernadette
authors.initials: B
authors.lastname: Boden-Albala
authors.forename: Mitchell F
authors.initials: MF
authors.lastname: Berman
authors.forename: J P
authors.initials: JP
authors.lastname: Mohr
authors.forename: Ralph L
authors.initials: RL
authors.lastname: Sacco
authors.forename: John
authors.initials: J
authors.lastname: Pile-Spellman
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data; D005260:Female; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D008297:Male; D008875:Middle Aged; D010043:Outcome and Process Assessment, Health Care; D012189:Retrospective Studies; D020521:Stroke / Q000188:drug therapy*; D015912:Thrombolytic Therapy / Q000706:statistics & numerical data*; D014481:United States / Q000453:epidemiology