Minimizing pneumocephalus during deep brain stimulation surgery

Background: Deep brain stimulation (DBS) surgery is an effective treatment for movement disorders. Introduction of intracranial air following dura opening in DBS surgery can result in targeting inaccuracy and suboptimal outcomes. We develop and evaluate a simple method to minimize pneumocephalus during DBS surgery. Methods: A retrospective analysis of prospectively collected data was performed on patients undergoing DBS surgery at our institution from 2014 to 2022. A total of 172 leads placed in 89 patients undergoing awake or asleep DBS surgery were analyzed. Pneumocephalus volume was compared between leads placed with PMT and leads placed with standard dural opening. (112 PMT vs. 60 OPEN). Immediate post-operative high-resolution CT scans were obtained for all leads placed, from which pneumocephalus volume was determined through a semiautomated protocol with ITK-SNAP software. Awake surgery was conducted with the head positioned at 15-30(degrees), asleep surgery was conducted at 0(degrees). Results: PMT reduced pneumocephalus from 11.2 cm(3)+/- 9.2 to 0.8 cm(3)+/- 1.8 (P<0.0001) in the first hemisphere and from 7.6 cm(3) +/- 8.4 to 0.43 cm(3) +/- 0.9 (P<0.0001) in the second hemisphere. No differences in adverse events were noted between PMT and control cases. Lower rates of post-operative headache were observed in PMT group. Conclusion: We present and validate a simple yet efficacious technique to reduce pneumocephalus during DBS surgery.