Appraisal of Cardiac Ejection Fraction With Liver Disease Severity: Implication in Post–Liver Transplantation Mortality. Issue 4 (6th March 2020) - Kwon, Hye‐Mee
Abstract : Background and Aims: Enhanced sympathetic nervous activation and peripheral vasodilation in end‐stage liver disease (ESLD) may limit the importance of left ventricular ejection fraction (LVEF) as an influential prognosticator. We sought to understand the LVEF and cardiac dimensions in ESLD patients in order to define the LVEF threshold to predict all‐cause mortality after liver transplantation (LT). Approach and Results: Data were collected prospectively from the Asan LT Registry between 2008 and 2016, and outcomes were retrospectively reviewed. LVEF, end‐diastolic volume index (EDVI), and end‐diastolic elastance (Eed) were measured by preoperative echocardiography. Of 2, 799 patients, 452 (16.2%) had LVEF ≤ 60%, with 29 (1.0%) having LVEF < 55% and 269 (9.6%) had LVEF ≥ 70%. Over a median of 5.4‐year follow‐up, 329 (11.8%) patients died: 104 (3.7%) died within 90 days. LVEF (range, 30%‐81%) was directly proportionate to Model for End‐stage Liver Disease (MELD) scores, an index of liver disease severity, in survivors but showed a fixed flat‐line pattern in nonsurvivors (interaction P = 0.004 between groups), with lower EDVI ( P = 0.013) and higher Eed ( P = 0.001) in the MELD ≥ 20 group. Patients with LVEF ≤ 60% had higher 90‐day (13% vs. 7.4%; log rank, P = 0.03) and median 5.4‐year (26.7% vs. 16.2%; log rank, P = 0.003) mortality rates in the MELD ≥ 20 group, respectively, compared to those with LVEF > 60%. Specifically, in the MELD > 35 group, median 5.4‐year mortality rate was 53.3% in patients with LVEF ≤ 60% versus 24% in those with LVEF > 60% (log rank P < 0.001). By contrast, mortality rates of LVEF ≤ 60% and > 60% were similar in the MELD < 20 group (log rank P = 0.817). Conclusions: LVEF ≤ 60% is strongly associated with higher post‐LT mortality rates in the MELD ≥ 20 group, indicating the need to appraise both LVEF and liver disease severity simultaneously. Enhanced diastolic elastance with low EDVI provides insights into pathogenesis of low LVEF in nonsurvivors with MELD ≥ 20.