The LASSO regression results showed that the Lambda.1se value at the minimum cross-validation error was 0.081, and the corresponding characteristic variables included nine indicators: complicated with hypertension, body mass index, red blood cell count at admission, platelet count at admission, albumin level at admission, chest infection, frailty, pre-operative heart failure, and hemodilution on CPB. Here, ALB is linked to hypertensive disorder.