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To assess the effectiveness of standardizing operating room (OR) to intensive care unit (ICU) handoffs in a mixed surgical population.Standardizing OR to ICU handoffs improves information transfer after cardiac surgery, but there is limited evidence in other surgical contexts.This prospective interventional cohort study (NCT02267174) was conducted in 2 surgical ICUs in 2 affiliated hospitals. From 2014 to 2016, we developed, implemented, and assessed the effectiveness of a new standardized handoff protocol requiring bedside clinician communication using an information template. The primary study outcome was number of information omissions out of 13 possible topics, recorded by trained observers. Data were analyzed using descriptive statistics, bivariate analyses, and multivariable regression.We observed 165 patient transfers (68 pre-, 97 postintervention). Before standardization, observed handoffs had a mean 4.7 ± 2.9 information omissions each. After standardization, information omissions decreased 21.3% to 3.7 ± 1.9 (P = 0.023). In a pre-specified subanalysis, information omissions for new ICU patients decreased 36.2% from 4.7 ± 3.1 to 3.0 ± 1.6 (P = 0.008, interaction term P = 0.008). The decrement in information omissions was linearly associated with the number of protocol steps followed (P < 0.001). After controlling for patient stability, the intervention was still associated with reduced omissions. Handoff duration increased after standardization from 4.1 ± 3.3 to 8.0 ± 3.9 minutes (P < 0.001). ICU mortality and length of stay did not change postimplementation.Standardizing OR to ICU handoffs significantly improved information exchange in 2 mixed surgical ICUs, with a concomitant increase in handoff duration. Additional research is needed to identify barriers to and facilitators of handoff protocol adherence.