BACKGROUND: Recently proposed cutoff criteria for cerebrospinal fluid (CSF) analyses might safely exclude a diagnosis of @entity510 ( @entity510 ). OBJECTIVE: The objective of this study was to examine the sensitivity of a CSF red blood cell (RBC) count greater than 2000 * 10(6)/L (ie, 2000 RBCs per microliter) or the presence of visible @entity5173 in identifying @entity1 with @entity510 . METHODS: We identified a retrospective case series of @entity1 diagnosed with @entity510 after lumbar puncture (LP) in an integrated health delivery system between January 2000 and June 2013 by chart review. All identified @entity1 had at least 1 @entity438 that was treated with a neurosurgical or endovascular intervention during the index hospitalization. The lowest CSF RBC count was used for validation analysis. Cerebrospinal fluid color was determined by visual inspection. Xanthochromia was defined as pink, orange, or yellow pigmentation of CSF supernatant. RESULTS: Sixty-four @entity1 met study inclusion criteria. Of these, 17 (33%) of 52 underwent LP within 12 hours of @entity10 onset, and 49 (84%) of 58 exhibited @entity5173 . The median CSF RBC count was 63250 * 10(6)/L. The sensitivity of a CSF RBC count of greater than 2000 * 10(6)/L in identifying @entity510 was 96.9% (95% confidence interval, 89.3%-99.1%). Additional consideration of @entity5173 resulted in a sensitivity of 100% (95% confidence interval, 94.3%-100%). CONCLUSIONS: All @entity1 in this case series of @entity1 with @entity510 had either a CSF RBC count greater than 2000 * 10(6)/L or visible @entity5173 , increasing the likelihood that this proposed cutoff strategy may safely identify @entity1 who warrant further investigation for an aneurysmal cause of @entity510 .

Validation of cerebrospinal fluid findings in XXXX .

@entity1 :: ('9606', 'Species') :: ['patients'] @entity510 :: ('MESH:D013345', 'Disease') :: ['aneurysmal subarachnoid hemorrhage', 'aSAH', 'subarachnoid hemorrhage'] @entity5173 :: ('MESH:D065634', 'Disease') :: ['CSF xanthochromia'] @entity10 :: ('MESH:D006261', 'Disease') :: ['headache'] @entity438 :: ('MESH:D002532', 'Disease') :: ['cerebral aneurysm']
@entity510 :: (MESH:D013345,Disease) :: ['aneurysmal subarachnoid hemorrhage']
