Statistical analysis
Statistical analyses were performed with R statistical software, version 3.4.4 (available online at The Horowitz index was calculated at each tracked time point (0, 24, 48, 72 h), and the measured values were evaluated with Welch’s two-sample t-test. The maximum level of norepinephrine (µg/kg/min) during the first 24 h after LuTx was compared in both groups using Welch’s two-sample t-test. Postoperative ICU stay and mechanical ventilation duration was recorded and analyzed by Wilcoxon tests. Moreover, 1-year survival in both study groups was followed and survival rates were compared using log-rank tests.