ALB and congestive heart failure: The results of multiple regression analysis were y = 0.626 + 0.012 × (operation time, min)  − 0.001 × (Water balance, ml) + 0.003 × (bleeding, ml)  − 1.191 × (chronic heart failure) − 0.838 × (chronic kidney disease) for NL ratio, and y = 4.269–0.012 × (age, year) + 0.108 × (chronic heart failure) for albumin.