Incidental Cold Agglutinins in Lung Transplant Recipients

BACKGROUND The relevance of cold agglutinins in lung transplantation (LTx) recipients is unclear. While there is typically no intentionally induced hypothermia, the cold preservation of organs could potentially lead to microvascular injury and vascular occlusion after implantation and reperfusion in the presence of cold agglutinins. This study aims to analyze the impact of cold agglutinins in lung transplant recipients on short- and long-term outcomes after LTx. METHODS We retrospectively analyzed the medical records of 251 patients who underwent LTx at our institution between March 2003 and June 2023. One hundred seventy-three patients were included in the study. Statistical analysis was performed using SPSS and GraphPad software. RESULTS One hundred seventy-three of 251 (69%) of the lung transplant recipients were tested for cold agglutinins, which were positive in 78 of 173 (45%) patients. Most had a temperature amplitude of 4 °C; a broader temperature amplitude was detected in 9 of 78 (12%) patients. While there was no effect on overall long-term survival, cold agglutinins were associated with an increased incidence of reperfusion edema (P = 0.0002), severe primary graft dysfunction grade 2/3 (PGD2/3; P = 0.001), and early postoperative thromboembolism (P = 0.04). Multivariate analysis revealed PGD2/3 and thromboembolism as independent predictors of reduced long-term survival (P = 0.003 and P = 0.003, respectively). Plasmapheresis shortly before LTx in selected patients with a high cold agglutinin titer and broad temperature amplitude removed the cold agglutinins for at least 2 mo with good patient outcomes. CONCLUSIONS Cold agglutinins are associated with an increased incidence of reperfusion edema, PGD2/3, and early postoperative thromboembolism after LTx. Further studies are warranted to evaluate the benefits of regular screening.