Predicting the Response of Hydroxocobalamin in Postoperative Vasoplegia in Recipients of Cardiopulmonary Bypass.

Objective: The primary aim of this study was to identify predictors of response to hydroxocobalamin.

Design: A retrospective cohort study.

Setting: A single large academic medical center within the cardiovascular surgery intensive care unit.

Participants: Postoperative cardiovascular surgery patients within 96 hours of cardiopulmonary bypass separation between May 7, 2018, and August 1, 2020.

Interventions: None.

Measurements And Main Results: Of the 66 administrations, 43 administrations yielded hemodynamic improvements (65.2%). Comparing responders to nonresponders, nonresponders had a greater median cardiopulmonary bypass duration (223 v 131 minutes; p < 0.001) and a prolonged median cross-clamp time (153 v 77 minutes; p = 0.014). Multivariate modeling demonstrated a reduction in the odds of being a responder by 57% for every 60 minutes of cardiopulmonary bypass duration (odds ratio, 0.43; 95% confidence interval, 0.28-0.68; p < 0.001), but there was no significant difference based on time from intensive care unit admission to hydroxocobalamin administration (odds ratio, 0.95; 95% confidence interval, 0.88-1.03; p = 0.20).

Conclusion: Shorter total bypass duration and more rapid utilization after bypass of hydroxocobalamin were associated with a higher likelihood of response to refractory vasoplegic shock.