title: Clinical characteristics and risk factors of chronic subdural haematoma associated with clipping of unruptured cerebral aneurysms.
abstract: Chronic subdural haematoma (CSDH) is an uncommon but potentially serious complication of clipping unruptured cerebral aneurysms. We conducted a study to identify the patients who are at risk of developing postoperative CSDH. The data from 713 consecutive patients who underwent clipping of unruptured anterior circulation aneurysms were reviewed, and risk factors correlated with CSDH were identified by multivariate regression analysis of demographic variables. Fifteen patients (2.1%) developed CSDH after the surgery. Advanced age (odds ratio [OR] 1.151, 95% confidence interval [CI] 1.051-1.261) and male gender (OR 3.167, 95% CI 1.028-9.751) were correlated with CSDH. Subsequently, all 713 patients were quadrichotomized on the basis of gender and age, with 70 years as the cut-off value for age. The frequency of CSDH in men <70 years of age was 1.3% and that in men ≥70 years of age was 15.1%, with risk of CSDH was significantly higher in the older men (OR 13.39; 95% CI: 3.42-52.44). The frequency of CSDH in women <70 years of age was 0.6% and that in women ≥70 years of age was 3.7%. As in men, the risk of CSDH was significantly higher in the older women (OR 6.69, 95% CI 1.10-40.73). The interval between the aneurysm clipping and CSDH development was 0.5-6 months, suggesting that clinical observation should be continued up to 6 months after surgery. Although prognosis for patients with a postoperative CSDH complication is generally favourable, the risk of CSDH should be taken into account when considering elective clipping of unruptured aneurysms in patients ≥70 years of age.
authors.affiliation: Department of Neurosurgery, Fujita Health University School of Medicine, 1-98 Kutsukake, Toyoake 458-0831, Japan. inamasu@fujita-hu.ac.jp
authors.forename: Joji
authors.initials: J
authors.lastname: Inamasu
authors.forename: Takeya
authors.initials: T
authors.lastname: Watabe
authors.forename: Tsukasa
authors.initials: T
authors.lastname: Ganaha
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Yamada
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Nakae
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Ohmi
authors.forename: Shuei
authors.initials: S
authors.lastname: Imizu
authors.forename: Takafumi
authors.initials: T
authors.lastname: Kaito
authors.forename: Keisuke
authors.initials: K
authors.lastname: Ito
authors.forename: Yuya
authors.initials: Y
authors.lastname: Nishiyama
authors.forename: Takuro
authors.initials: T
authors.lastname: Hayashi
authors.forename: Hirotoshi
authors.initials: H
authors.lastname: Sano
authors.forename: Yoko
authors.initials: Y
authors.lastname: Kato
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Hirose
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D020200:Hematoma, Subdural, Chronic / Q000209:etiology* / Q000473:pathology; D006801:Humans; D002532:Intracranial Aneurysm / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012737:Sex Factors; D016896:Treatment Outcome; D014656:Vascular Surgical Procedures / Q000009:adverse effects*
keywords: Chronic subdural haematoma; Clipping; Risk factor; Unruptured cerebral aneurysm