INTRODUCTION: Delayed @entity2806 (DCI) after @entity510 ( @entity510 ) can be reversible or progress to @entity385 . In @entity1 with a deterioration clinically diagnosed as DCI, we investigated whether CT perfusion (CTP) can distinguish between reversible @entity63 and @entity63 progressing to @entity385 . METHODS: From a prospectively collected series of @entity510 @entity1 , we included those with DCI, CTP on the day of clinical deterioration, and follow-up imaging. In qualitative CTP analyses (visual assessment), we calculated positive and negative predictive value ( @entity2286 and NPV) with 95  % confidence intervals (95%CI) of a perfusion deficit for @entity1188 on follow-up imaging. In quantitative analyses, we compared perfusion values of the least perfused brain tissue between @entity1 with and without @entity1188 by using receiver-operator characteristic curves and calculated a threshold value with @entity2286 and NPV for the perfusion parameter with the highest area under the curve. RESULTS: In qualitative analyses of 33 included @entity1 , 15 of 17 @entity1 (88  %) with and 6 of 16 @entity1 (38  %) without @entity1188 on follow-up imaging had a perfusion deficit during clinical deterioration (p   =   0.002). Presence of a perfusion deficit had a @entity2286 of 71  % (95%CI: 48-89  %) and NPV of 83  % (95%CI: 52-98  %) for @entity1188 on follow-up. Quantitative analyses showed that an absolute minimal cerebral blood flow (CBF) threshold of 17.7  mL/100  g/min had a @entity2286 of 63  % (95%CI: 41-81  %) and a NPV of 78  % (95%CI: 40-97  %) for @entity1188 . CONCLUSIONS: CTP may differ between @entity1 with DCI who develop @entity1188 and those who do not. For this purpose, qualitative evaluation may perform marginally better than quantitative evaluation.

CT perfusion during delayed @entity2806 after XXXX : distinction between reversible @entity63 and @entity63 progressing to @entity1188 .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity2806 :: ('MESH:D002545', 'Disease') :: ['cerebral ischemia'] @entity63 :: ('MESH:D007511', 'Disease') :: ['ischemia'] @entity510 :: ('MESH:D013345', 'Disease') :: ['aneurysmal subarachnoid hemorrhage', 'aSAH'] @entity2286 :: ('12211', 'Species') :: ['PPV'] @entity1188 :: ('MESH:D007238', 'Disease') :: ['infarction'] @entity385 :: ('MESH:D002544', 'Disease') :: ['cerebral infarction']
@entity510 :: (MESH:D013345,Disease) :: ['subarachnoid hemorrhage']
