title: Reducing the delay in thrombolysis: is it necessary to await the results of renal function tests before computed tomography perfusion and angiography in patients with code stroke?
abstract: OBJECTIVE
  We sought to determine the percentage of patients presenting with code stroke who would be excluded from computed tomography angiography, computed tomography perfusion, or both based on their emergency department laboratory results (creatinine and glomerular filtration rate) and the incidence of contrast-induced nephropathy in patients with code stroke who receive contrast.
  
  
  METHODS
  We conducted a retrospective analysis of our prospective code stroke database.
  
  
  METHODS
  The study took place in an emergency department at a university medical center.
  
  
  RESULTS
  A total of 131 consecutive patients with code stroke were identified. Of these, 11 (8.4%) would not have received contrast based on a creatinine level greater than 1.5 mg/dL on initial evaluation. However, 10 of these 11 patients (91%) had a history of renal disease. A total of 3% of patients who received contrast developed contrast-induced nephropathy.
  
  
  CONCLUSIONS
  Our findings suggest that the use of contrast agents in patients with code stroke before availability of renal function tests appears safe in patients who do not have a known history of renal disease.
authors.affiliation: Stroke Division, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215, USA. mmehdira@bidmc.harvard.edu
authors.forename: Manu
authors.initials: M
authors.lastname: Mehdiratta
authors.forename: Gottfried
authors.initials: G
authors.lastname: Schlaug
authors.forename: Sandeep
authors.initials: S
authors.lastname: Kumar
authors.forename: Louis R
authors.initials: LR
authors.lastname: Caplan
authors.forename: Magdy
authors.initials: M
authors.lastname: Selim