title: The Predicting Factors for Recurrence of Chronic Subdural Hematoma Treated with Burr Hole and Drainage.
abstract: OBJECTIVE
  Chronic subdural hematoma (CSDH) is common in elderly patients. So, with an increasing number of elderly people in the general population, there is a need to investigate risk factors which increase recurrence rate. In this study, factors affecting the postoperative recurrence are investigated based on the reoperative CSDH cases.
  
  
  METHODS
  Total of ninety-seven patients was enrolled in this study who had have operation for CSDH. In all patients, one burr hole trephination and drainage was the method of choice for the initial treatment of CSDH. We retrospectively evaluated several factors which affect to recurrence of CSDH.
  
  
  RESULTS
  Retrospective analysis was performed in 97 patients. Sixteen patients experienced reoperation within 3 months (16/97, 16.5%) for recurrence of CSDH. And, when hematoma was divided by internal architecture, heterogeneous density group seems to be have close relationship with recurrence more significantly than homogeneous density group (p=0.002). Hypertension, diabetes mellitus, early removal of drainage tube, bilaterality of hematoma also have significant relationship with recurrence.
  
  
  CONCLUSIONS
  Recurrence rate of CSDH treated with one burr hole drainage is related with some various factors. There was statistically significant difference between recurred group and non-recurred group. Not only demographic factors but also internal architecture on preoperative brain computed tomography is a significant predicting factor of recurrence in CSDH patients who underwent a surgery. In this study, heterogeneous type hematoma have significantly related with recurrence of CSDH. We should give attention to these predicting factors for more effective care.
authors.affiliation: Department of Neurosurgery, Hanyang University Medical Center, Seoul, Korea.
authors.forename: Dae Hyo
authors.initials: DH
authors.lastname: Song
authors.affiliation: Department of Neurosurgery, Hanyang University Medical Center, Seoul, Korea.
authors.forename: Young Soo
authors.initials: YS
authors.lastname: Kim
authors.affiliation: Department of Neurosurgery, Hanyang University Medical Center, Seoul, Korea.
authors.forename: Hyoung Joon
authors.initials: HJ
authors.lastname: Chun
authors.affiliation: Department of Neurosurgery, Hanyang University Medical Center, Seoul, Korea.
authors.forename: Hyeong Joong
authors.initials: HJ
authors.lastname: Yi
authors.affiliation: Department of Neurosurgery, Hanyang University Medical Center, Seoul, Korea.
authors.forename: Koang Hum
authors.initials: KH
authors.lastname: Bak
authors.affiliation: Department of Neurosurgery, Hanyang University Medical Center, Seoul, Korea.
authors.forename: Yong
authors.initials: Y
authors.lastname: Ko
authors.affiliation: Department of Neurosurgery, Hanyang University Medical Center, Seoul, Korea.
authors.forename: Suck Jun
authors.initials: SJ
authors.lastname: Oh
keywords: Hematoma, subdural, chronic; Recurrence; Risk factors