Anesthesiology critical care medicine (ACCM) fellowship training was accredited in 1989, and a small number of graduating anesthesiology residents pursue this additional training. Considering the flexible program guidelines of the American Board of Anesthesiology (ABA), we hypothesized that ACCM fellowship training programs varied significantly among the 42 institutions accredited to offer this program. This study of ACCM fellowship programs used a six-part, 57-item questionnaire completed by 36 program directors to describe six aspects of the program: institution size, program director, attending staff, fellowship applicants, curriculum, and the role of the American Society of Critical Care Anesthesiologists (ASCCA). Ninety-four percent of ACCM fellowships are in facilities with more than 400 beds; 81% of these institutions have more than 20 intensive care unit (ICU) beds as the basis for fellowship teaching. Eighty-three percent of ACCM program directors have practiced critical care for more than 5 yr. All programs had more than one attending physician, with the majority having a multidisciplinary attending staff. During two academic years (1990-1992), 12 (33%) of 36 programs did not have a fellow, resulting in an average of less than one fellow for each program. ACCM fellow involvement in patient care was characterized as "primary" in medical and pediatric ICUs and "cooperative" in surgical ICUs. Fellowship curricula had varied requirements for research, intraoperative anesthesia, and ICU procedures performed by the fellow. In general, program directors believe that salary and on-call responsibility are not important issues for applicants. Nineteen percent of program directors train ACCM fellows longer than the 12 mo required by the ABA and believe that ACCM training should be lengthened.