title: [Retrospective statistical analysis of clinical factors of recurrence in chronic subdural hematoma: correlation between univariate and multivariate analysis].
abstract: OBJECTIVE
  Chronic subdural hematoma is common in elderly individuals and surgical procedures are simple. The recurrence rate of chronic subdural hematoma, however, varies from 9.2 to 26.5% after surgery. The authors studied factors of the recurrence using univariate and multivariate analyses in patients with chronic subdural hematoma
  
  
  METHODS
  We retrospectively reviewed 239 consecutive cases of chronic subdural hematoma who received burr-hole surgery with irrigation and closed-system drainage. We analyzed the relationships between recurrence of chronic subdural hematoma and factors such as sex, age, laterality, bleeding tendency, other complicated diseases, density on CT, volume of the hematoma, residual air in the hematoma cavity, use of artificial cerebrospinal fluid.
  
  
  RESULTS
  Twenty-one patients (8.8%) experienced a recurrence of chronic subdural hematoma. Multiple logistic regression found that the recurrence rate was higher in patients with a large volume of the residual air, and was lower in patients using artificial cerebrospinal fluid. No statistical differences were found in bleeding tendency.
  
  
  CONCLUSIONS
  Techniques to reduce the air in the hematoma cavity are important for good outcome in surgery of chronic subdural hematoma. Also, the use of artificial cerebrospinal fluid reduces recurrence of chronic subdural hematoma. The surgical procedures can be the same for patients with bleeding tendencies.
authors.affiliation: Department of Surgical Neurology, Ibukino Hospital, Osaka, Japan.
authors.forename: Motoharu
authors.initials: M
authors.lastname: Takayama
authors.forename: Keita
authors.initials: K
authors.lastname: Terui
authors.forename: Yoshitsugu
authors.initials: Y
authors.lastname: Oiwa
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D020200:Hematoma, Subdural, Chronic / Q000150:complications / Q000473:pathology* / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D012008:Recurrence; D012189:Retrospective Studies; D013355:Subdural Space / Q000473:pathology; D016896:Treatment Outcome; D055815:Young Adult