Risk Factors of In-Hospital Mortality in Adult Postcardiotomy Cardiogenic Shock Patients Successfully Weaned from Venoarterial Extracorporeal Membrane Oxygenation

Mortality of adult postcardiotomy cardiogenic shock patients after successfully weaned from venoarterial extracorporeal membrane oxygenation remains high. The objective of this study is to identify the risk factors associated with mortality after successfully weaning from venoarterial extracorporeal membrane oxygenation in adult postcardiotomy cardiogenic shock patients.

All consecutive patients who were successfully weaned from venoarterial extracorporeal membrane oxygenation between January 2011 and December 2016 at the Beijing Anzhen Hospital were analyzed retrospectively. Multivariate logistic regression was performed to identify risk factors associated with in-hospital mortality after successfully weaning from venoarterial extracorporeal membrane oxygenation.

In total, 212 (58.4%) of 363 postcardiotomy cardiogenic shock patients were successfully weaned from venoarterial extracorporeal membrane oxygenation. The non-survivors had a longer duration of extracorporeal membrane oxygenation than the survivors (120.0 (98.0, 160.50) vs. 100.0 (77.0, 126.0), p = 0.000). Variables associated with mortality of patients successfully weaned from extracorporeal membrane oxygenation by univariable analysis were age, diabetes, vasoactive inotropic score pre-extracorporeal membrane oxygenation, vasoactive inotropic score at weaning, left ventricular ejection fraction at weaning, central venous pressure at weaning, sequential organ failure assessment score pre-extracorporeal membrane oxygenation, sequential organ failure assessment at weaning, survival after venoarterial ECMO pre-extracorporeal membrane oxygenation, and survival after venoarterial ECMO at weaning. In the multivariate analysis, sequential organ failure assessment score at weaning (odds ratio = 1.889, 95% confidence interval = 1.460-2.455, p < 0.001) was an independent risk factor for in-hospital mortality of patients successfully weaned from venoarterial extracorporeal membrane oxygenation. The cumulative 30-day survival rate in patients with a sequential organ failure assessment score < 7 was significantly (p < 0.001) higher than in patients with a sequential organ failure assessment score ⩾ 7 (87% vs. 56.7%, p < 0.001).

Vasoactive inotropic score, left ventricular ejection fraction, central venous pressure, and sequential organ failure assessment score at weaning were associated with in-hospital mortality for postcardiotomy cardiogenic shock patients successfully weaned from venoarterial extracorporeal membrane oxygenation. Sequential organ failure assessment score might help clinicians to predict in-hospital mortality for patients successfully weaned from venoarterial extracorporeal membrane oxygenation.