title: Pooled assessment of computed tomography interpretation by vascular neurologists in the STRokE DOC telestroke network.
abstract: OBJECTIVE
  The objective of this pooled analysis was to determine the level of agreement between central read and each of 2 groups (spoke radiologists and hub vascular neurologists) in interpreting head computed tomography (CT) scans of stroke patients presenting to telestroke network hospitals.
  
  
  METHODS
  The Stroke Team Remote Evaluation Using a Digital Observation Camera (STRokE DOC and STRokE DOC-AZ TIME) trials were prospective, randomized, and outcome blinded comparing telemedicine and teleradiology with telephone-only consultations. In each trial, the CT scans of the subjects were interpreted by the hub vascular neurologist in the telemedicine arm and by the spoke radiologist in the telephone arm. We obtained a central read for each CT using adjudicating committees blinded to treatment arm and outcome. The data were pooled and the results reported for the entire population. Kappa statistics and exact agreement rates were used to assess interobserver agreement for radiographic contraindication to recombinant tissue plasminogen activator (rt-PA), presence of hemorrhage, tumor, hyperdense artery, acute stroke, prior stroke, and early ischemic changes.
  
  
  RESULTS
  Among 261 analyzed cases, the agreement with central read for the presence of radiological rt-PA contraindication was excellent for hub vascular neurologist (96.2%, κ = .81, 95% CI .64-.97), spoke radiologist report (94.7%, κ = .64, 95% CI .39-.88), and overall (95.4%, κ = .74, 95% CI .59-.88). For rt-PA-treated patients (N = 65), overall agreement was 98.5%, and vascular neurologist agreement with central read was 100%.
  
  
  CONCLUSIONS
  Both vascular neurologists and reports from spoke radiologists had excellent reliability in identifying radiologic rt-PA contraindications. These pooled findings demonstrate that telestroke evaluation of head CT scans for acute rt-PA assessments is reliable.
authors.affiliation: Department of Neurosciences, University of California, San Diego, California. Electronic address: ispokoyn@ucsd.edu.
authors.forename: Ilana
authors.initials: I
authors.lastname: Spokoyny
authors.affiliation: Department of Neurosciences, University of California, San Diego, California; Department of Family and Preventative Medicine, University of California, San Diego, California.
authors.forename: Rema
authors.initials: R
authors.lastname: Raman
authors.affiliation: Department of Family and Preventative Medicine, University of California, San Diego, California.
authors.forename: Karin
authors.initials: K
authors.lastname: Ernstrom
authors.affiliation: Department of Neurosciences, Mayo Clinic, Phoenix, Arizona.
authors.forename: Bart M
authors.initials: BM
authors.lastname: Demaerschalk
authors.affiliation: Department of Neurosciences, Cedars Sinai Medical Center, Los Angeles, California.
authors.forename: Patrick D
authors.initials: PD
authors.lastname: Lyden
authors.affiliation: Department of Neurosciences, University of California, San Diego, California.
authors.forename: Thomas M
authors.initials: TM
authors.lastname: Hemmen
authors.affiliation: Department of Neurosciences, University of California, San Diego, California.
authors.forename: Amy K
authors.initials: AK
authors.lastname: Guzik
authors.affiliation: Department of Radiology, University of California, San Diego, California.
authors.forename: James Y
authors.initials: JY
authors.lastname: Chen
authors.affiliation: Department of Neurosciences, University of California, San Diego, California.
authors.forename: Brett C
authors.initials: BC
authors.lastname: Meyer
mesh_terms: D000075202:Contraindications; D005343:Fibrinolytic Agents; D006801:Humans; D009462:Neurology; D015588:Observer Variation; D018579:Patient Selection; D011237:Predictive Value of Tests; D011379:Prognosis; D012017:Referral and Consultation; D015203:Reproducibility of Results; D018570:Risk Assessment; D012307:Risk Factors; D012720:Severity of Illness Index; D020521:Stroke / Q000000981:diagnostic imaging* / Q000188:drug therapy; D013689:Telephone; D019112:Teleradiology / Q000379:methods*; D015912:Thrombolytic Therapy; D010959:Tissue Plasminogen Activator; D014057:Tomography, X-Ray Computed
chemical_list: D005343:Fibrinolytic Agents; D010959:Tissue Plasminogen Activator
keywords: CT interpretation by nonradiologists; Telemedicine; computed tomography; stroke