The relationship between E/e′ class and ICU length of stay, without adjustments for other predictors (univariate model, left) and with adjustments for age, gender, hypertension, diabetes mellitus, history of myocardial infarction, operation type, elective status, and aortic cross clamp duration (multivariate model, right). In both the univariate and multivariate models, an E/e′ value ≥8 was significantly associated with prolonged ICU-LOS. For presentation, data are truncated to 500 h (95% of values were at or below 500 h of ICU stay).