Association Between Surgeon and Anesthesiologist Sex Discordance and Postoperative Outcomes A Population-based Cohort Study

Objective: To examine the effect of surgeon-anesthesiologist sex discordance on postoperative outcomes. Summary Background Data: Optimal surgical outcomes depend on teamwork, with surgeons and anesthesiologists forming two key components. There are sex and gender-based differences in interpersonal communication and medical practice which may contribute to patients' perioperative outcomes. Methods: We performed a population-based, retrospective cohort study among adult patients undergoing one of 25 common elective or emergent surgical procedures from 2007-2019 in Ontario, Canada. We assessed the association between differences in sex between surgeon and anesthesiologists (sex discordance) on the primary endpoint of adverse postoperative outcome, defined as death, readmission, or complication within 30-days following surgery using generalized estimating equations. Results: Among 1,165,711 patients treated by 3,006 surgeons and 1,477 anesthesiologists, 791,819 patients were treated by sex concordant teams (male surgeon/male anesthesiologist: 747,327 and female surgeon/female anesthesiologist: 44,492) while 373,892 were sex discordant (male surgeon/female anesthesiologist: 267,330 and female surgeon/male anesthesiologist: 106,562). Overall, 12.3% of patients experienced one or more adverse postoperative outcomes of whom 1.3% died. Sex discordance between surgeon and anesthesiologist was not associated with a significant increased likelihood of composite adverse postoperative outcomes (adjusted odds ratio [aOR] 1.00, 95% confidence interval [CI] 0.97-1.03). Conclusions: We did not demonstrate an association between intraoperative surgeon and anesthesiologist sex discordance on adverse postoperative outcomes in a large patient cohort. Patients, clinicians, and administrators may be reassured that physician sex discordance in operating room teams is unlikely to clinically meaningfully affect patient outcomes after surgery.