title: Utility of the stroke-thrombolytic predictive instrument.
abstract: OBJECTIVE
  The goal of this study was to evaluate the utility of the stroke thrombolytic predictive instrument (s-TPI) in predicting clinical outcome in patients with acute ischaemic stroke treated with intravenous tissue plasminogen activator (t-PA).
  
  
  METHODS
  The study assessed the external validity of the s-TPI in 301 consecutive stroke patients treated with intravenous t-PA. Clinical outcome was measured with the modified Rankin scale (mRs) at 3 months. The study used the s-TPI to calculate probabilities of a good outcome (mRs 0-1) and a poor outcome (mRs 5-6). We compared these probabilities with the observed outcome using receiver-operator characteristics (ROC) curves and calibration curves. Subgroup analyses for different onset-to-treatment time windows were performed.
  
  
  RESULTS
  According to the s-TPI, the mean predicted probability of a good and a poor outcome in the validation cohort were 0.45 and 0.17. The area under the ROC curves were 0.80 (4.5-hour time window), 0.82 (3-hour time window) and 0.77 (3-4.5 hours time window) for predicting good outcome, and 0.78 (4.5 hours), 0.80 (3 hours) and 0.74 (3-4.5 hours) for predicting poor outcome. Calibration curves revealed a slight overestimation of probabilities of a good outcome and underestimation of probabilities of a poor outcome.
  
  
  CONCLUSIONS
  The s-TPI appears to be reasonably valid for predicting outcome after t-PA treatment in daily practice, although a slight overestimation of a good and underestimation of a poor outcome was observed.
authors.affiliation: Department of Neurology, University Medical Center Groningen, Hanzeplein 1, 9700 RB Groningen, The Netherlands. m.uyttenboogaart@neuro.umcg.nl
authors.forename: M
authors.initials: M
authors.lastname: Uyttenboogaart
authors.forename: R E
authors.initials: RE
authors.lastname: Stewart
authors.forename: P C
authors.initials: PC
authors.lastname: Vroomen
authors.forename: G-J
authors.initials: GJ
authors.lastname: Luijckx
authors.forename: J
authors.initials: J
authors.lastname: De Keyser
mesh_terms: D000208:Acute Disease; D000368:Aged; D001921:Brain / Q000098:blood supply*; D002545:Brain Ischemia / Q000175:diagnosis* / Q000188:drug therapy*; D002560:Cerebrovascular Circulation / Q000502:physiology; D005260:Female; D005343:Fibrinolytic Agents / Q000627:therapeutic use*; D006801:Humans; D007275:Injections, Intravenous; D008297:Male; D011237:Predictive Value of Tests; D011446:Prospective Studies; D010959:Tissue Plasminogen Activator / Q000627:therapeutic use*
chemical_list: D005343:Fibrinolytic Agents; D010959:Tissue Plasminogen Activator