CT灌注原始图像不匹配模型评价急性缺血性脑卒中缺血半暗带和梗死核心的价值

目的 评价CT灌注原始图像(CT perfusion source images,CTP-SI)不匹配模型在判断缺血半暗带和梗死核心中的价值.方法 24例急性缺血性脑卒中患者(发病时间＜9 h)行"一站式急性缺血性脑卒中CT"扫描,分析基线动脉期及静脉期CTP-SI Alberta卒中早期CT评分(Alberta Stroke Program Early CT Score,ASPECTS),并与随访影像ASPECTS进行对照.采用Wilcoxon秩和检验比较动脉期与静脉期CTP-SI ASPECTS之间的统计学差异;应用多元线性回归分析基线动脉期、静脉期CTP-SI与随访影像ASPECTS之间的线件依存关系.结果 基线动脉期、静脉期和随访影像的CTP-SI ASPECTS中位数分别为9.0分(2.0～10.0分)、9.3分(6.5～10.0分)、9.0分(7.0～10.0分).动脉期与静脉期CTP-SI ASPECTS差异有统计学意义(Z=-2.812,P=0.005),10例静脉期CTP-SI ASPECTS大于动脉期,14例静脉期CTP-SI ASPECTS等于动脉期;静脉期CTP-SIASPECTS与随访影像ASPECTS之间的线性依存关系有统计学意义,标准化回归系数(Beta)=0.715,P=0.003.结论 CT灌注原始图像不匹配模型可以预测缺血半暗带和梗死核心,为临床医师制定治疗方案时提供了更多的选择.

Application of a new mismatch model on evaluating infarct core and penumbra in acute ischemic stroke using CT perfusion source images

Objective To assess the diagnostic value of determining infarct core and penumbra using CT perfusion source images (CTP-SI) mismatch model in hemispheric stroke less than 9 hours.Methods "one-stop shop" CT examination including non-contrast enhanced CT (NCCT), CTP, CT angiography (CTA) were performed in 24 patients with symptoms of stroke less than 9 hours.The Alberta Stroke Program Early CT Score (ASPECTS) were analyzed on arterial phase CTP-SI and venous phase CTP SI using Wilcoxon rank-sum test, then compared with the follow up imaging ASPECTS using multiple linear regression.Results The median (min-max) scores of ASPECTS on arterial phase CTP-SI, venous phase CTP-SI and follow-up imaging were 9.0 ( 2.0-10.0 ), 9.3 ( 6.5-10.0 ) and 9.0 ( 7.0-10.0 ),respectively. ASPECTS measured on arterial phase CTP-SI significantly differed from the ASPECTS on venous phase CTP-SI ( Z =-2.812, P = 0.005 ).Moreover, the linear regression analysis showed significant correlation between the ASPECTS on venous phase CTP-SI and follow up imaging ASPECTS ( Beta =0.715,P = 0.003 ).Conclusion CTP-SI mismatch model provides a method of choice in predicting penumbra and infarct core in hemispheric stroke.