The role of coronary artery disease in lung transplantation: a propensity-matched analysis

Background and aimsCandidate selection for lung transplantation (LuTx) is pivotal to ensure individual patient benefit as well as optimal donor organ allocation. The impact of coronary artery disease (CAD) on post-transplant outcomes remains controversial. We provide comprehensive data on the relevance of CAD for short- and long-term outcomes following LuTx and identify risk factors for mortality. Methods We retrospectively analyzed all adult patients (>= 18 years) undergoing primary and isolated LuTx between January 2000 and August 2021 at the LMU University Hospital transplant center. Using 1:1 propensity score matching, 98 corresponding pairs of LuTx patients with and without relevant CAD were identified. Results Among 1,003 patients having undergone LuTx, 104 (10.4%) had relevant CAD at baseline. There were no significant differences in in-hospital mortality (8.2% vs. 8.2%, p>0.999) as well as overall survival (HR 0.90, 95%CI [0.61, 1.32], p=0.800) between matched CAD and non-CAD patients. Similarly, cardiovascular events such as myocardial infarction (7.1% CAD vs. 2.0% non-CAD, p=0.170), revascularization by percutaneous coronary intervention (5.1% vs. 1.0%, p=0.212), and stroke (2.0% vs. 6.1%, p=0.279), did not differ statistically between both matched groups. 7.1% in the CAD group and 2.0% in the non-CAD group (p=0.078) died from cardiovascular causes. Cox regression analysis identified age at transplantation (HR 1.02, 95%CI [1.01, 1.04], p<0.001), elevated bilirubin (HR 1.33, 95%CI [1.15, 1.54], p<0.001), obstructive lung disease (HR 1.43, 95%CI [1.01, 2.02], p=0.041), decreased forced vital capacity (HR 0.99, 95%CI [0.99, 1.00], p=0.042), necessity of reoperation (HR 3.51, 95%CI [2.97, 4.14], p<0.001) and early transplantation time (HR 0.97, 95%CI [0.95, 0.99], p=0.001) as risk factors for all-cause mortality, but not relevant CAD (HR 0.96, 95%CI [0.71, 1.29], p=0.788). Double lung transplant was associated with lower all-cause mortality (HR 0.65, 95%CI [0.52, 0.80], p<0.001), but higher in-hospital mortality (OR 2.04, 95%CI [1.04, 4.01], p=0.039). Conclusion In this cohort, relevant CAD was not associated with worse outcomes and should therefore not be considered a contraindication for LuTx. Nonetheless, cardiovascular events in CAD patients highlight the necessity of control of cardiovascular risk factors and a structured cardiac follow-up.