Background: Death and disability of subarachnoid hemorrhage(SAH) are caused by lesions of cerebral hernia, spasm of cerebral blood vessels, injuries the blood brain barrier, or communicating hydrocephalus.Cerebrospinal fluid displacement through lumbar puncture can clear the bloody cerebrospinal fluid and reduce the blood pollution of the cerebrospinal fluid, shorten xanthochromia time, reduce the intracranial pressure early and meninges stimulation. Intrathecal injection of dexamethasone can reduce defense reaction of the meninges, tissue adhesion and organization at the same time.
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