Prognosticating Mortality of Primary Cardiogenic Shock Requiring Extracorporeal Life Support: The RESCUE Score

We aimed to identify prognostic laboratory markers during extracorporeal life support (ECLS) in patients with primary refractory cardiogenic shock (RCS) and to create a preliminary specific mortality score. All 208 consecutive subjects admitted for primary RCS and treated with ECLS between January-2009 and December-2018 were retrospectively analyzed. Multivariate regression analysis on laboratory markers during the first nine days of ECLS was used to develop a 'Refractory End-stage Shock CUred with Ecls' (RESCUE) score. Serum creatinine (OR=3.72, 95%CI:2.01-6.88), direct bilirubin (OR=1.40, 95%CI:1.05-1.8), and platelet count (OR=0.62, 95%CI:0.42-0.94) were independent predictors of in-hospital mortality and were included in the score. The mean AUC was 0.763 (95%CI:0.698-0.828) in the development cohort and 0.729 (95%CI:0.664-0.794) in the bootstrap internal validation cohort. The RESCUE score represents a novel promising instrument to predict early mortality during the first critical days of ECLS and to help in properly guiding the therapeutic decision-making process.