title: Transient ischemic attack after tissue plasminogen activator: aborted stroke or unnecessary stroke therapy?
abstract: BACKGROUND
  The frequency with which intravenous thrombolysis for acute ischemic stroke results in normal clinical and radiographic status is currently unknown.
  
  
  METHODS
  Patients who received intravenous thrombolysis at community hospitals and a stroke center were retrospectively analyzed for occurrence of normal imaging after tissue plasminogen activator (tPA) treatment. The cases were classified as nonischemic process (stroke mimic), transient ischemic attack (TIA) or ischemic stroke. The occurrence rate and predictors of each condition were sought.
  
  
  RESULTS
  Of 254 patients who received tPA, 9 (3.5%) had a nonischemic process, 23 (9.1%) had TIA, and 222 (87%) were diagnosed with ischemic stroke. Nonischemic process patients were younger and were more likely to have received tPA at a community hospital than those with TIA or stroke. TIA was associated with lower pretreatment serum glucose, prevalence of coronary artery disease and stroke severity but not to time to treatment.
  
  
  CONCLUSIONS
  Over 10% of patients who receive tPA for cerebral ischemia do not develop ischemic injury. tPA use for a nonischemic process is infrequent but is associated with community hospital use.
authors.affiliation: UPMC Stroke Institute, Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA. uchinok@ccf.org
authors.forename: Ken
authors.initials: K
authors.lastname: Uchino
authors.forename: Lori
authors.initials: L
authors.lastname: Massaro
authors.forename: Maxim D
authors.initials: MD
authors.lastname: Hammer
mesh_terms: D000368:Aged; D002545:Brain Ischemia / Q000150:complications / Q000175:diagnosis / Q000188:drug therapy*; D005343:Fibrinolytic Agents / Q000008:administration & dosage*; D006764:Hospitals, Community; D006801:Humans; D007262:Infusions, Intravenous; D002546:Ischemic Attack, Transient / Q000175:diagnosis / Q000188:drug therapy*; D008279:Magnetic Resonance Imaging; D008875:Middle Aged; D012042:Registries; D012189:Retrospective Studies; D020521:Stroke / Q000175:diagnosis / Q000188:drug therapy* / Q000209:etiology; D015912:Thrombolytic Therapy; D010959:Tissue Plasminogen Activator / Q000008:administration & dosage*; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome; D019564:Unnecessary Procedures
chemical_list: D005343:Fibrinolytic Agents; D010959:Tissue Plasminogen Activator