• Joji Inamasu, Takeya Watabe, Tsukasa Ganaha, Yasuhiro Yamada, Shunsuke Nakae, Tatsuo Ohmi, Shuei Imizu, Takafumi Kaito, Keisuke Ito, Yuya Nishiyama, Takuro Hayashi, Hirotoshi Sano, Yoko Kato, and Yuichi Hirose.
• Department of Neurosurgery, Fujita Health University School of Medicine, 1-98 Kutsukake, Toyoake 458-0831, Japan. inamasu@fujita-hu.ac.jp
• J Clin Neurosci. 2013 Aug 1;20(8):1095-8.

AbstractChronic 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.Copyright © 2012 Elsevier Ltd. All rights reserved.

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