Claassen et al proposed a rating scale for CT changes seen on brain CT. The grade correlates with delayed cerebral ischemia and cerebral infarction. The authors are from Columbia University.
Patient selection: subarachnoid hemorrhage
Predictors of delayed cerebral ischemia:
(1) thick clot completely filling any cistern or fissure (OR 2.3)
(2) blood in both lateral ventricles (OR 4.1)
(3) admission mean arterial blood pressure > 112 mm Hg (OR 4.9)
(4) transcranial Doppler mean velocity > 140 cm/s within 5 days of hemorrhage (OR 3.8)
Other risk factors:
(1) smoking within the past 6 months (OR 2.4)
(2) admission Glasgow coma score < 15 (OR 2.4)
(3) admission NIHSS >= 6 (OR 2.4)
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