title: Does lamina terminalis fenestration reduce the incidence of chronic hydrocephalus after subarachnoid hemorrhage?
abstract: OBJECTIVE
  The incidence of chronic hydrocephalus requiring cerebrospinal fluid shunting was analyzed for a prospective series of 52 consecutive patients with ruptured cerebral aneurysms who underwent fenestration of the lamina terminalis during early microsurgical aneurysm repair. We hypothesized that, by creating an anterior ventriculocisternostomy, fenestration of the lamina terminalis would facilitate cerebrospinal fluid dynamics and decrease the risk of subsequent hydrocephalus.
  
  
  METHODS
  Patients were enrolled according to the following criteria: 1) age more than 40 years; 2) admission Hunt and Hess Grade 2 to 4; 3) initial subarachnoid hemorrhage severity of Fisher Grade 3 or 4; and 4) early microsurgical repair of an anterior circulation aneurysm.
  
  
  RESULTS
  The mortality rate in this series was 9.6%. Of the 47 surviving patients, 32 (68%) were discharged with a Glasgow Outcome Scale score of 5, 10 (21%) with a Glasgow Outcome Scale score of 4, and 5 (11%) with a Glasgow Outcome Scale score of 3. The follow-up period ranged from 12 to 60 months. Chronic hydrocephalus was radiographically and clinically evident in 3.8% of the total population. Shunt surgery was performed for two patients who exhibited symptoms resulting from hydrocephalus, corresponding to 4.2% of the surviving patients.
  
  
  CONCLUSIONS
  Estimates from the most recently published studies indicate that an incidence of chronic post-subarachnoid hemorrhage hydrocephalus (requiring shunt surgery) of 15 to 20% is representative for an average contemporary population of patients with aneurysmal subarachnoid hemorrhage. The lower incidence of chronic hydrocephalus observed in this series possibly reflects the favorable effect of lamina terminalis fenestration on cerebrospinal fluid dynamics.
authors.affiliation: Department of Neurosurgery, University of Messina Medical School, Italy.
authors.forename: F
authors.initials: F
authors.lastname: Tomasello
authors.forename: D
authors.initials: D
authors.lastname: d'Avella
authors.forename: O
authors.initials: O
authors.lastname: de Divitiis
mesh_terms: D000328:Adult; D000368:Aged; D017542:Aneurysm, Ruptured / Q000401:mortality / Q000601:surgery*; D002908:Chronic Disease; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006849:Hydrocephalus / Q000175:diagnosis / Q000401:mortality / Q000601:surgery*; D002532:Intracranial Aneurysm / Q000175:diagnosis / Q000401:mortality / Q000601:surgery*; D008297:Male; D008866:Microsurgery / Q000379:methods*; D008875:Middle Aged; D012307:Risk Factors; D013345:Subarachnoid Hemorrhage / Q000175:diagnosis / Q000401:mortality / Q000601:surgery*; D015996:Survival Rate; D020542:Third Ventricle / Q000601:surgery*; D017287:Ventriculoperitoneal Shunt