Table 2:

Interrater agreement for the per-patient diagnosis of severe vasospasm on DSA using 50% vessel narrowing threshold (dichotomized)

κ (95% CI)InterventionalJunior (n = 9)Senior (n = 8)
All Raters (n=17)Neuroradiologists (n = 10)Neurosurgeons (n = 4)Neurologists (n = 3)
Supraclinoid ICA0.568(0.489–0.646)0.535 (0.457–0.626)0.549 (0.450–0.642)0.625 (0.509–0.725)0.484 (0.400–0.567)0.652 (0.562–0.735)
M1 segment0.576 (0.517–0.629)0.579 (0.515–0.633)0.514 (0.433–0.593)0.554(0.461–0.643)0.512(0.444–0.574)0.638(0.575–0.693)
A1 segment0.511 (0.460–0.562)0.511(0.457-0.563)0.452 (0.376–0.527)0.512 (0.444–0.588)0.512 (0.453–0.571)0.495 (0.444–0.550)
Basilar0.533 (0.413–0.646)0.488 (0.364–0.604)0.538 (0.364–0.697)0.551 (0.391–0.699)0.475 (0.348–0.604)0.617 (0.493–0.737)
Per-patient assessmenta0.556 (0.498–0.611)0.558 (0.494–0.616)0.495 (0.412–0.583)0.546 (0.452–0.638)0.483 (0.414–0.552)0.629 (0.566–0.686)
Decision to proceed with EVT0.393 (0.344–0.444)0.393 (0.336–0.445)0.414 (0.344–0.490)0.319 (0.229–0.415)0.382 (0.328–0.445)0.410 (0.351–0.469)

  • Note:—EVT indicates endovascular treatment.

  • ↵a Severe vasospasm affecting at least 1 arterial segment (not a single A1).