Distribution of US anesthesia providers and services.

This study describes the correlation between anesthesia providers by type (Certified Registered Nurse Anesthetist [CRNA] or anesthesiologist) and their respective rural or urban distributions across America. Analyses are based on county level data contained in several distinct databases with a given assumption that most providers practice and reside in the same rural or urban designation category. Data reveal that 91.6% (28,569) of active practicing anesthesiologists reside in metropolitan counties and that 8.4% (2,625) reside in nonmetropolitan counties. Of the 26,658 active practicing CRNAs, 81.4% (21,701), reside in metropolitan counties as opposed to 18.6% (4,957) in nonmetropolitan counties. Overall, analyses indicate that out of a total of 3,140 counties, there are 843 counties in the United States where neither anesthesiologists nor CRNAs reside. Ninety-seven percent (816) of these counties are nonmetropolitan.