The ultimate aim of this study is to improve the outcome of patients with severe head injury by reducing secondary brain injury. It is hoped that this will be achieved by improving clinical management through the adoption of Best Practice monitoring measures. The severe head injury population is a disparate clinical group with varying CBF derangements, and complex inter-relationships between the various physiological parameters which are being measured. Common protocol based therapy for all head-injured patients is simplistic and cannot fully accommodate the variations between patients or within an individual brain. We believe that to improve outcome, these individual derangements and patterns have to be identified and the correct therapeutic combinations fashioned on an individual basis. This is not the current practice in Australia. The first phase of this project was completed in March 2004 following the recruitment of ten patients. These patients were intensively monitored and based on the data collected and current international literature we devised a new treatment protocol for patients with severe head injuries. We anticipate that implementation of this new protocol will improve outcome.