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Background Subarachnoid hemorrhage(SAH) accounts for approximately 3-7% of all cerebral strokes.It is a devastating condition,often resulting in severe neurologic disability or death.Despite the rapid progress in medical science,effective SAH treatment is still lacking.DIND is a significant cause of morbidity and mortality in survivors of SAH.Lumbar drainage of cerebrospinal fluid is used to clear blood in subarachnoid space,in order to decrease DIND and improve functional outcome of SAH patients.There have been several randomized clinical trials published in the literature to suggest that drainage of cerebrospinal fluid through the lumbar cistern may be of some benefit in improving outcome of SAH patients.The aim of this review is to systematically analyse all the randomized controlled trials of CSF drainage for SAH patients to provide the best available evidence for clinical practice and further research strategies for SAH treatment.Objectives To assess the efficacy and safety of lumbar drainage of cerebrospinal fluid in patients with subarachnoid hemorrhage.Methods Types of studies:randomised controlled trials.Types of participants:patients of any age or sex with subarachnoid hemorrhage will be eligible.Types of interventions:trials evaluating lumbar drainage of cerebrospinal fluid regardless of the volume of drainage,the length of treatment period or medication injection during drainage(if any).The control interventions are standard therapies of SAH.Types of outcome measures:Primary outcomes:Unfavourable outcome (death,vegetative state,or severe disability (modified Rankin Scale (mRS) score 4 to 6) at 1,3 or 6 months after SAH.Secondary outcomes:prevalence of of DIND after SAH,recurrent haemorrhage,a sudden clinical deterioration with rebleeding,complications from the intervention.Electronic searches:Cochrane Stroke Group Trials Register;Chinese Stroke Trials Register;Cochrane Central Register of Controlled Trials (CENTRAL) ;MEDLINE ;EMBASE (1980 to present) ;et al.Results This review is still ongoing and results will be presented in the conference.