van der Jagt M, Hasan D, Bijvoet H W, Pieterman H, Koudstaal P J, Avezaat C J
University Department of Neurology, Academisch Ziekenhuis Rotterdam Dijkzigt, the Netherlands.
Neurology. 2000 Jun 13;54(11):2156-8. doi: 10.1212/wnl.54.11.2156.
Interobserver variability in the prediction of delayed cerebral ischemia by means of blood on CT was investigated in 159 patients with aneurysmal subarachnoid hemorrhage, admitted within 72 hours after the bleed. The authors found considerable interobserver variability in the assessment of the amount of blood in the individual cisterns. A high sum score was an independent predictor for delayed cerebral ischemia only for rater 1 (rater 1: hazard ratio, 3.26; 95% confidence interval [CI], 1.14 to 7.75; rater 2: hazard ratio, 1.72; 95% CI, 0.72 to 4.09). The authors conclude that interobserver variability limits the predictive power of the amount of blood on CT for the occurrence of cerebral ischemia.
对159例动脉瘤性蛛网膜下腔出血患者在出血后72小时内入院，研究了通过CT上的血液预测迟发性脑缺血时观察者间的变异性。作者发现，在评估各个脑池内的血液量时，观察者间存在相当大的变异性。仅对于评估者1而言，高总分是迟发性脑缺血的独立预测因素（评估者1：风险比，3.26；95%置信区间[CI]，1.14至7.75；评估者2：风险比，1.72；95%CI，0.72至4.09）。作者得出结论，观察者间的变异性限制了CT上血液量对脑缺血发生的预测能力。
