1 The North American Malignant Hyperthermia Registry of the Malignant Hyperthermia Association of the United States, Department of Anesthesiology, University of Florida College of Medicine, Gainesville, Florida, Malignant Hyperthermia Association of the United States, Sherburne, New York, [email protected] Department of Anesthesia and Pain Management, University Health Network, University of Toronto, Toronto, Canada, Board of Directors and Professional Advisory Council, Malignant Hyperthermia Association of the United States, Sherburne, New York Board of Directors and Professional Advisory Council, Malignant Hyperthermia Association of the United States, Sherburne, New York.