1 is Assistant Professor, Department of Anesthesiology; is a Resident, Department of Anesthesiology; is a Resident, Department of Neurology; and is an Assistant Professor, Department of Neurology; all at the University of Minnesota School of Medicine. and Brian Tolly are Staff Anesthesiologists and Jamie Starks is a Neurologist in the Geriatric Research Education & Clinical Center, at the Minneapolis Veterans Affairs Health Care System in Minnesota.