title: Impact of Time Interval between Trauma Onset and Burr Hole Surgery on Recurrence of Late Subacute or Chronic Subdural Hematoma.
abstract: OBJECTIVE
  Although subdural hematoma (SDH) is commonly treatable by burr hole surgery in the late subacute or chronic stage, there is no clear consensus regarding appropriate management and exact predictive factors for postoperative recurrence also remain unclear. The aim of this study was to evaluate risk factors associated with recurrence of SDH that requires burr hole surgery in the late subacute or chronic stage. We also identified the appropriate timing of surgery for reducing the recurrence.
  
  
  METHODS
  We retrospectively reviewed 274 patients with SDH in the late subacute or chronic stage treated with burr hole surgery in our hospital between January 2007 and December 2014. Excluding patients with acute intracranial complications or unknown time of trauma onset left 216 patients included in the study.
  
  
  RESULTS
  Of 216 patients with SDH in the late subacute or chronic stage, recurrence was observed in 36 patients (16.7%). The timing of the operation in patients with late subacute stage (15-28 days) resulted in a significant decrease in recurrence (RR, 0.33; 95% CI, 0.17-0.65; p=0.001) compared to chronic stage (>28 days). Otherwise, no significant risk factors were associated with recurrences including comorbidities and surgical details.
  
  
  CONCLUSIONS
  The results indicated that time from trauma onset to burr hole surgery may be important for decreasing the risk of recurrence. Therefore, unless patients can be treated conservatively without surgery, prompt surgical management is recommended in patients diagnosed as having late subacute or chronic subdural hematoma treatable by burr hole surgery, even when neurological deficits are unclear.
authors.affiliation: Department of Neurosurgery, Eulji General Hospital, College of Medicine, Eulji University, Seoul, Korea.
authors.forename: Dae-In
authors.initials: DI
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Eulji General Hospital, College of Medicine, Eulji University, Seoul, Korea.
authors.forename: Jae-Hoon
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Eulji General Hospital, College of Medicine, Eulji University, Seoul, Korea.
authors.forename: Hee-In
authors.initials: HI
authors.lastname: Kang
authors.affiliation: Department of Neurosurgery, Eulji General Hospital, College of Medicine, Eulji University, Seoul, Korea.
authors.forename: Byung-Gwan
authors.initials: BG
authors.lastname: Moon
authors.affiliation: Department of Neurosurgery, Eulji General Hospital, College of Medicine, Eulji University, Seoul, Korea.
authors.forename: Joo-Seung
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Eulji General Hospital, College of Medicine, Eulji University, Seoul, Korea.
authors.forename: Deok-Ryeong
authors.initials: DR
authors.lastname: Kim
keywords: Recurrence; Subdural hematoma; Time