Division of Cardiology, University of Toronto/University Health Network, Toronto, Ontario, Canada. Department of Emergency Medicine, St. Paul's Hospital, University of British Columbia, Vancouver, British Columbia, Canada. Department of Clinical Neurologic Sciences, Western University/London Health Sciences Centre, London, Ontario, Canada. Department of Anesthesia and Perioperative Medicine, Western University/London Health Sciences Centre, London, Ontario, Canada. Critical Care Western, Western University/London Health Sciences Centre, London, Ontario, Canada; Department of Anesthesia and Perioperative Medicine, Western University/London Health Sciences Centre, London, Ontario, Canada. Division of Cardiology, Western University/London Health Sciences Centre, London, Ontario, Canada. Division of Cardiac Surgery, Western University/London Health Sciences Centre, London, Ontario, Canada; Critical Care Western, Western University/London Health Sciences Centre, London, Ontario, Canada. Electronic address: dave.nagpal@lhsc.on.ca.