虽然多数报道指出腰穿(LP)可证实蛛网膜下腔再出血。但因为首次出血后血性脑脊液可持续长达24小时,所以LP有时难以确定。脑脊液(CSF)中红细胞计数似乎是比较客观的检查方法,但腰穿时的外伤也可引起红细胞增多。反之,如果血液滞留在脑实质内或硬膜下腔,CSF可无再出血征象。曾有人认为,分光光度测定显示血性脑脊液中氧合 Although most reports indicate that lumbar puncture (LP) can confirm subarachnoid rebleeding. However, since the bloody cerebrospinal fluid can last up to 24 hours after the first hemorrhage, LP is sometimes difficult to determine. Erythrocyte counts in cerebrospinal fluid (CSF) appear to be more objective tests, but trauma on lumbar puncture can also cause an increase in red blood cells. Conversely, if the blood remains in the intraparenchymal or subdural space, there is no sign of rebleeding in the CSF. Some people think that spectrophotometry showed oxygenated cerebrospinal fluid