title: Perfusion CT for selecting patients with acute ischemic stroke for intravenous thrombolytic therapy.
abstract: OBJECTIVE
  To determine rates of death, disability, and symptomatic intracranial hemorrhage ( SICH symptomatic ICH ) among patients with acute ischemic stroke selected for thrombolytic therapy by using perfusion computed tomography (CT) by conducting a systematic review and meta-analysis.
  
  
  METHODS
  A search of the literature up to July 2012 was performed by using MEDLINE, EMBASE, the Cochrane Library, PubMed, and Google Scholar on terms including "brain ischemia" and "perfusion imaging." The search was unrestricted by language of publication. Two reviewers extracted study data and independently assessed the risk of study bias. Outcomes of patients selected by using perfusion CT, including case-fatality rate, favorable outcome (modified Rankin Scale [ mRS modified Rankin Scale ] score, ≤2), and rates of SICH symptomatic ICH , were estimated.
  
  
  RESULTS
  Thirteen experimental or observational studies that included patients who received intravenous thrombolytic treatment after perfusion CT were identified. The methodologic quality of the small studies was generally good. Overall, 90-day mortality was 10.0% (95% confidence interval [ CI confidence interval ]: 5.4%, 15.9%). Among patients treated within 3 hours of symptom onset, mortality was 12.5% (95% CI confidence interval : 6.7%, 19.7%), a favorable outcome ( mRS modified Rankin Scale score, ≤2) was seen in 42.5% of patients (95% CI confidence interval : 16.6%, 70.9%), and the SICH symptomatic ICH rate was 3.3% (95% CI confidence interval : 0.7%, 7.7%). Among patients treated more than 3 hours after symptom onset, mortality was 2.9% (95% CI confidence interval : 0.0%, 12.7%), 69.9% of patients (95% CI confidence interval : 0%, 83.5%) had a favorable outcome, and the SICH symptomatic ICH rate was 3.9% (95% CI confidence interval : 0.8%, 9.2%).
  
  
  CONCLUSIONS
  The outcomes (mortality, morbidity, and SICH symptomatic ICH rates) for patients selected with perfusion CT to receive intravenous thrombolytic treatment more than 3 hours after symptom onset appear favorable.
authors.affiliation: From the Institute for Health Policy, Management and Evaluation (K.R.B., M.K.K., A.L.), Department of Medical Imaging (K.R.B., R.I.A., A.R.M.), Institute of Medical Sciences (R.I.A., A.R.M.), and Department of Medicine (M.K.K., A.L.), University of Toronto, 263 McCaul St, 4th Floor, Toronto, ON, Canada M5T 1W7; Department of Medical Imaging, Fraser Health Authority, Vancouver, British Columbia, Canada (D.D.); Department of Medical Imaging, University of British Columbia, Vancouver, British Columbia, Canada (D.D.); Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada (M.K.K.); and Li Ka Shing Knowledge Institute, St. Michael's Hospital, Toronto, Ontario, Canada (A.L.).
authors.forename: Kirsteen R
authors.initials: KR
authors.lastname: Burton
authors.forename: Deljit
authors.initials: D
authors.lastname: Dhanoa
authors.forename: Richard I
authors.initials: RI
authors.lastname: Aviv
authors.forename: Alan R
authors.initials: AR
authors.lastname: Moody
authors.forename: Moira K
authors.initials: MK
authors.lastname: Kapral
authors.forename: Andreas
authors.initials: A
authors.lastname: Laupacis
mesh_terms: D002545:Brain Ischemia / Q000000981:diagnostic imaging* / Q000188:drug therapy*; D019317:Evidence-Based Medicine; D005343:Fibrinolytic Agents / Q000627:therapeutic use*; D006801:Humans; D018579:Patient Selection; D020521:Stroke / Q000000981:diagnostic imaging* / Q000188:drug therapy*; D015912:Thrombolytic Therapy / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D005343:Fibrinolytic Agents