Sheffield Kent1, Greg Mehaffey2. 1. Department of Anesthesiology, University of Arkansas for Medical Sciences, UAMS Medical Center, 4301 West Markham St, Little Rock, AR 72205. Electronic address: skent@uams.edu. 2. Department of Anesthesiology, University of Arkansas for Medical Sciences, UAMS Medical Center, 4301 West Markham St, Little Rock, AR 72205. Electronic address: grmehaffey@uams.edu.