AndTo the memory of my mother, Rahma.ii
ACKNOWLEDGMENTSThanks go first to my advisor, Dr. Judith Marcoux, who supported me in this endeavor. I have always appreciated the trust she has shown in me. Thanks also to the program director of the neurosurgery residency at McGill University, Dr. Jeffrey Atkinson, who has given me the opportunity to have the time for the master study. I also thank the head of the neurosurgery department, Dr. Kevin Petrecca, who supported me to have the funding of this project, and to Mr. Kelvin Mok, the biomedical engineer at the neuronavigation unit, who was the key point for correspondence for the equipment supply, and who spared his time to help with the training of using the AxiEM navigation system. This project has been made possible by the funding provided by the Medtronic Surgical Technology Neurosurgery, which has provided the navigation system and the disposable kits plus the cost paid to the Research Institute of the Montreal University Hospital Centre. The authors report no conflict of interest concerning the methods used in this study or the findings specified in this paper, and have no personal financial or institutional interest in any of the materials, or devices described in this thesis.
iv
ABSTRACTExternal ventricular drain (EVD) placement is one of the most frequently performed neurosurgical procedures. Inaccuracies in the drain positioning and the need for multiple passes using the classic freehand insertion technique are increasingly reported in the literature. The problem is seen most frequently in the severe traumatic brain injury (TBI) population. Many proposed methods were discussed to improve the placement accuracy and none gained enough support to be implemented in EVD placement. The purpose of this study is to evaluate the use of electromagnetic neuronavigation guidance to aid EVD insertion to improve the accuracy and minimize the number of passes in severe TBI patients. The navigation was applied prospectively for all new severe TBI patients who required ventricular catheter placement over a year period, and this was compared to a retrospective cohort of severe TBI patients who had EVD inserted freehand in the preceding year. Fifty-four cases were recruited, 35 (64.8%) had their EVD placed using the freehand technique and 19 (35.2%) using navigation guidance. In the navigation group, the placement accuracy was as follows: 94.7% (18/19) achieved a grade 1 and 5.3% (1/19) a grade 2, while none were in