title: Subarachnoid haemorrhage (spontaneous aneurysmal).
abstract: BACKGROUND
  Subarachnoid haemorrhage (SAH) may arise spontaneously or as a result of trauma. Spontaneous SAH accounts for about 5% of all strokes. Ruptured aneurysms are the cause of 85% of spontaneous SAH. The most characteristic clinical feature is sudden-onset severe headache. Other features include vomiting, photophobia, and focal neurological deficit or seizures, or both. As the headache may have insidious onset in some cases, or may even be absent, a high degree of suspicion is required to diagnose SAH with less typical presentations.
  
  
  METHODS
  We conducted a systematic review, aiming to answer the following clinical question: What are the effects of surgical treatments for people with confirmed aSAH? We searched: Medline, Embase, The Cochrane Library, and other important databases up to October 2014 (Clinical Evidence reviews are updated periodically; please check our website for the most up-to-date version of this review).
  
  
  RESULTS
  At this update, searching of electronic databases retrieved 82 studies. After deduplication and removal of conference abstracts, 47 records were screened for inclusion in the overview. Appraisal of titles and abstracts led to the exclusion of 33 studies and the further review of 14 full publications. Of the 14 full articles evaluated, one systematic review, one RCT, and four further reports were added at this update. We performed a GRADE evaluation for six PICO combinations.
  
  
  CONCLUSIONS
  In this systematic overview, we categorised the efficacy for one comparison based on information about the effectiveness and safety of endovascular coiling versus surgical clipping.
authors.affiliation: Beaumont Hospital, Dublin, Ireland.
authors.forename: Kieron
authors.initials: K
authors.lastname: Sweeney
authors.forename: Nicholas
authors.initials: N
authors.lastname: Silver
authors.forename: Mohsen
authors.initials: M
authors.lastname: Javadpour
mesh_terms: D057510:Endovascular Procedures / Q000592:standards*; D006801:Humans; D013345:Subarachnoid Hemorrhage / Q000601:surgery*; D013525:Surgical Instruments