Prioritizing direct heart procurement in organ donors after circulatory death does not jeopardize lung transplant outcomes.

Abstract

Controlled donation after circulatory death (cDCD) has become a standard in liver, kidney, and lung transplantation (LTx). Based on recent innovations in exvivo heart preservation, heart transplant centers have started to accept cDCD heart allografts. Because the heart has very limited tolerance to warm ischemia, changes to the cDCD organ procurement procedures are needed. These changes entail delayed ventilation and prolonged warm ischemia for the lungs. Whether this negatively impacts lung allograft function is unclear. A retrospective analysis of cDCD lungs transplanted between 2012 and February 2022 at the Medical University of Vienna was performed. The heart+lung group consisted of cases in which the heart was procured by a cardiac team for subsequent normothermic exvivo perfusion. A control group (lung group) was formed by cases where only the lungs were explanted. In heart+lung group cases, the heart procurement team placed cannulas after circulatory death and a hands-off time, collected donor blood for exvivo perfusion, and performed rapid organ perfusion with Custodiol solution, after which the heart was explanted. Up to this point, the lung procurement team did not interfere. No concurrent lung ventilation or pulmonary artery perfusion was performed. After the cardiac procurement team left the table, ventilation was initiated, and lung perfusion was performed directly through both stumps of the pulmonary arteries using 2 large-bore Foley catheters. This study analyzed procedural explant times, postoperative outcomes, primary graft dysfunction (PGD), duration of mechanical ventilation, length of intensive care unit (ICU) stay, and early survival after LTx. A total of 56 cDCD lungs were transplanted during the study period. In 7 cases (12.5%), the heart was also procured (heart+lung group); in 49 cases (87.5%), only the lungs were explanted (lung group). Basic donor parameters were comparable in the 2 groups. The median times from circulatory arrest to lung perfusion (24minutes vs 13.5minutes; P=.002) and from skin incision to lung perfusion (14minutes vs 5minutes; P=.005) were significantly longer for the heart+lung procedures. However, this did not affect post-transplantation PGD grade at 0hours (P=.851), 24hours (P=.856), 48hours (P=.929), and 72hours (P=.874). At 72hours after transplantation, none of the lungs in the heart+lung group but 1 lung (2.2%) in lung group was in PGD 3. The median duration of mechanical ventilation (50hours vs 41hours; P=.801), length of ICU stay (8days vs 6days; P=.951), and total length of hospital stay (27days vs 25days; P=.814) were also comparable in the 2 groups. In-hospital mortality occurred in only 1 patient of the lung group (2.2%). Although prioritized cDCD heart explantation is associated with delayed ventilation and significantly longer warm ischemic time to the lungs, post-LTx outcomes within the first year are unchanged. Prioritizing heart perfusion and explantation in the setting of cDCD procurement can be considered acceptable.