Mid-Term Outcomes of Veno-Venous Extracorporeal Membrane Oxygenation as
a Bridge to Lung Transplantation: Comparison with Non-Bridged Recipients
Abstract
Objectives: Veno-venous extracorporeal membrane oxygenation
(VV-ECMO) is increasingly being used in acutely deteriorating patients
with end-stage lung disease as a bridge to transplantation (BTT). It can
allow critically ill recipients to remain eligible for lung transplant
(LTx) while reducing pretransplant deconditioning. We analyzed early and
mid-term postoperative outcomes of patients on VV-ECMO as a BTT and the
impact of preoperative VV-ECMO on posttransplant survival outcomes.
Methods: All consecutive LTx performed at our institution
between January 2012 and December 2018 were analyzed. After matching,
BTT patients were compared with non-bridged LTx recipients.
Results: Out of 297 transplanted patients, 21 (7.1%) were
placed on VV-ECMO as a BTT. After matching, we observed a similar 30-day
mortality between BTT and non-BTT patients (4.6% vs. 6.6%,
p=0.083) despite a higher incidence of early postoperative
complications (need for ECMO, delayed chest closure, acute kidney
injury). Furthermore, preoperative VV-ECMO did not appear associated
with 30-day or 1-year mortality in both frequentist and Bayesian
analysis (OR 0.35, 95%CI 0.03-3.49, p=0.369; OR 0.27, 95%CrI
0.01-3.82, P=84.7%, respectively). In sensitivity analysis, both
subgroups were similar in respect to 30-day (7.8% vs. 6.5%,
p=0.048) and 1-year mortality (12.5% vs. 18%, p=0.154).
Conclusions: Patients with acute refractory respiratory failure
while waiting for LTx represent a high-risk cohort of patients. We
observed that these patients can be successfully bridged to LTx with
VV-ECMO with post-transplant mortality comparable to non-BTT patients.