• Chihiro Itoi, Kentaro Hiromitsu, Shoko Saito, Ryoji Yamada, Nobusada Shinoura, and Akira Midorikawa.
• Department of Literature, Graduate School of Chuo University, 742-1 Higashi-nakano, Hachioji, Tokyo 192-0393, Japan. Electronic address: itoi.chihiro@gmail.com.
• Clin Neurol Neurosurg. 2015 Dec 1; 139: 307-10.

ObjectiveAn awake craniotomy is a safe neurological surgical technique that minimizes the risk of brain damage. During the course of this surgery, the patient is asked to perform motor or cognitive tasks, but some patients exhibit severe sleepiness. Thus, the present study investigated the predictive value of a patient's preoperative neuropsychological background in terms of sleepiness during an awake craniotomy.MethodsThirty-seven patients with brain tumor who underwent awake craniotomy were included in this study. Prior to craniotomy, the patient evaluated cognitive status, and during the surgery, each patient's performance and attitude toward cognitive tasks were recorded by neuropsychologists.ResultsThe present findings showed that the construction and calculation abilities of the patients were moderately correlated with their sleepiness.ConclusionThese results indicate that the preoperative cognitive functioning of patients was related to their sleepiness during the awake craniotomy procedure and that the patients who exhibited sleepiness during an awake craniotomy had previously experienced reduced functioning in the parietal lobe.Copyright © 2015 Elsevier B.V. All rights reserved.

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