Can J Emerg Med
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Clinical question:Is lumbar puncture still needed in suspected subarachnoid hemorrhage with a negative head computed tomographic scan performed within 6 hours of headache onset?Article chosen:Perry JJ, Stiell IG, Sivilotti ML, et al. Sensitivity of computed tomography performed within six hours of onset of headache for diagnosis of subarachnoid haemorrhage: prospective cohort study. BMJ 2011;343:d4277. Objective:To determine whether lumbar puncture can be safely omitted after a negative head computed tomographic scan in the workup of a suspected subarachnoid hemorrhage.