title: Can the combination of a negative computed tomography result and a negative lumbar puncture safely exclude the diagnosis of subarachnoid hemorrhage in patients with thunderclap headache?
abstract: OBJECTIVE
  How many patients who had a negative computed tomography and lumbar puncture result on initial evaluation were diagnosed with subarachnoid hemorrhage in the subsequent 6 months to 3 years?
  
  
  METHODS
  Perry J, Spacek A, Forbes M, et al. Is the combination of negative computed tomography result and negative lumbar puncture result sufficient to rule out subarachnoid hemorrhage? Ann Emerg Med 2008;51:707-13.
  
  
  OBJECTIVE
  To determine the sensitivity of both a negative computed tomography and a negative lumbar puncture in ruling out subarachnoid hemorrhage.
authors: Mohammed Aref
authors: MA
authors: Malabarey
authors: David
authors: D
authors: Barbic
mesh_terms: D003937:Diagnosis, Differential; D005500:Follow-Up Studies; D051270:Headache Disorders, Primary / Q000175:diagnosis / Q000209:etiology*; D006801:Humans; D011446:Prospective Studies; D015203:Reproducibility of Results; D013129:Spinal Puncture / Q000379:methods*; D013345:Subarachnoid Hemorrhage / Q000150:complications / Q000175:diagnosis*; D013997:Time Factors; D014057:Tomography, X-Ray Computed / Q000379:methods*