Agreement regarding diagnosis of transient ischemic attack fairly low among stroke-trained neurologists.
OBJECTIVE
Agreement between physicians to define the likelihood of a transient ischemic attack (TIA) remains poor. Several studies have compared neurologists with nonneurologists, and neurologists among themselves, but not between fellowship-trained stroke neurologists. We investigated the diagnostic agreement in 55 patients with suspected TIA.


METHODS
The history and physical examination findings of 55 patients referred to the Stanford TIA clinic from the Stanford emergency room were blindly reviewed by 3 fellowship-trained stroke neurologists who had no knowledge of any test results or patient outcomes. Each patient's presentation was rated as to the likelihood that the presentation was consistent with TIA. We used 3 different scales (2-, 3-, and 4-point scales) to define TIA likelihood. We assessed global agreement between the raters and evaluated the biases related to individual raters and scale type.


RESULTS
The agreement between fellowship-trained stroke neurologists remained poor regardless of the rating system used and the statistical test used to measure it. Difference in rating bias among all raters was significant for each scale: P=0.001, 0.012, and <0.001. In addition, for each reviewer, the rate of labeling an event an "unlikely TIA" progressively decreased with the number of points that composed the scale.


CONCLUSIONS
TIA remains a highly subjective diagnosis, even among stroke subspecialists. The use of confirmatory testing beyond clinical judgment is needed to help solidify the diagnosis. Caution should be used when diagnosing an event as a possible TIA.
Castle
James
J
Department of Neurology, NorthShore University HealthSystem, Pritzker School of Medicine, Evanston, Ill, USA.
Mlynash
Michael
M
Lee
Karming
K
Caulfield
Anna Finley
AF
Wolford
Connie
C
Kemp
Stephanie
S
Hamilton
Scott
S
Albers
Gregory W
GW
Olivot
Jean-Marc
JM
D003299:Cooperative Behavior; D006801:Humans; D002546:Ischemic Attack, Transient / Q000175:diagnosis* / Q000628:therapy; D009462:Neurology / Q000379:methods / Q000592:standards*; D010820:Physicians / Q000523:psychology / Q000592:standards*; D020521:Stroke / Q000175:diagnosis* / Q000628:therapy