Mark J. Robitaille and colleagues investigated the association between oxygen delivery during cardiopulmonary bypass (CPB) and postoperative mortality. This retrospective study, published in Anesthesiology on September 28, 2026, analyzed data from 4,358 adults who underwent cardiac surgery at a single tertiary center between 2018 and 2024. Time-weighted average indexed oxygen delivery (DO₂i) was calculated using…