Authors: Mansour A et al.
Anesthesiology, January 13, 2026, 10.1097/ALN.0000000000005930
This observational study examined the incidence, risk factors, and outcomes of severe postoperative bleeding following adult heart transplantation. While bleeding is a well-recognized complication in cardiac surgery, limited data exist regarding its frequency and consequences specifically after heart transplantation.
The investigators conducted a multicenter observational study at two major French heart transplant referral centers. All adult patients who underwent heart transplantation between 2015 and 2022 were included. The primary objective was to determine how often severe postoperative bleeding occurs after transplant surgery.
Severe bleeding was defined using the Universal Definition of Perioperative Bleeding (UDPB), with severe hemorrhage classified as a score of 3 or greater. This standardized system incorporates clinical findings such as blood product requirements, surgical re-exploration, and physiologic consequences of bleeding.
A total of 446 heart transplant recipients were analyzed. Among these patients, 112 individuals (25%) experienced severe postoperative bleeding. This finding indicates that significant hemorrhage is a relatively common complication following heart transplantation.
The researchers also examined factors that independently predicted severe bleeding. Multivariable logistic regression analysis identified three significant risk factors. First, patients who had long-term mechanical circulatory support prior to transplantation had more than twice the odds of severe bleeding compared with those without such support. This likely reflects the complex coagulation abnormalities and surgical challenges associated with ventricular assist devices.
Second, lower preoperative hemoglobin levels were associated with an increased bleeding risk. Each increase in baseline hemoglobin was protective, suggesting that preoperative anemia may contribute to hemorrhagic complications.
Third, longer cardiopulmonary bypass (CPB) duration significantly increased bleeding risk. For every 10-minute increase in CPB time, the risk of severe bleeding increased. Prolonged bypass is known to contribute to coagulopathy through hemodilution, platelet dysfunction, and inflammatory activation.
Beyond identifying risk factors, the study also examined the clinical consequences of severe bleeding. Patients who experienced severe hemorrhage had substantially worse outcomes. One-year mortality was markedly higher in patients with severe bleeding compared with those without it (35% vs 13%).
After adjustment for other clinical variables, severe postoperative bleeding remained independently associated with increased mortality at one year, with nearly double the risk of death.
These findings emphasize that hemorrhagic complications following heart transplantation are not merely technical issues confined to the operating room. Instead, they have major implications for long-term survival and postoperative recovery.
The authors suggest that strategies aimed at minimizing bleeding risk may improve outcomes in this population. Potential areas for improvement include optimizing preoperative hemoglobin levels, minimizing cardiopulmonary bypass duration when possible, and carefully managing coagulation in patients with mechanical circulatory support devices.
The study highlights the need for further research to develop preventive strategies and targeted perioperative management approaches to reduce bleeding complications after heart transplantation.
What You Should Know
Severe postoperative bleeding occurs in approximately one-quarter of heart transplant patients.
Patients with mechanical circulatory support devices before transplantation have significantly higher bleeding risk.
Lower preoperative hemoglobin and longer cardiopulmonary bypass times are independent predictors of severe bleeding.
Severe hemorrhage after heart transplantation is strongly associated with increased one-year mortality.
These findings underscore the importance of perioperative strategies aimed at reducing bleeding risk in transplant recipients.
Key Points
Severe postoperative bleeding occurred in 25% of heart transplant patients.
Mechanical circulatory support before transplantation doubled the risk of severe bleeding.
Lower preoperative hemoglobin levels increased bleeding risk.
Longer cardiopulmonary bypass duration independently predicted hemorrhagic complications.
Severe bleeding was associated with significantly higher one-year mortality (35% vs 13%).
Reducing bleeding complications may improve long-term outcomes after heart transplantation.
Thank you to Anesthesiology for allowing us to summarize this article.