(January 13, 2009 - Insidermedicine) Dr. Ian Stiell MD, MSc, FRCPC, discusses the Ontario Prehospital Advanced Life Support (OPALS) study, the Ottawa Ankle Rules and the Canadian C-Spine rule. Dr. Stiell is a Clinical Epidemiologist at the Ottawa Health Research Institute as well as the OHRI Chair of Emergency Medicine Research. Dr. Stiell is also Professor and Chair of the Department of Emergency Medicine as well as the University Health Research Chair at the University of Ottawa.