CST4 and heart failure: The top 20 variables listed in their study were as follows: New York Heart Association Classification at discharge, heart failure at admission, heart rate, age, left ventricular ejection fraction, serum cystatin, initial BNP, platelet count, fibrinogen, serum creatinine, blood glucose, systolic blood pressure, diastolic blood pressure, total bilirubin, blood urea nitrogen, and revascularization type.