NPPB and diabetes mellitus: The main scoring content includes New York Heart Association class, diabetes, preoperative renal function, chronic obstructive pulmonary disease, left ventricular ejection fraction, myocardial infarction ≤21 days ago, cardiogenic shock, and so on.[28–30] The increase in NT-proBNP levels is associated with all of the above factors; therefore, it lacks sufficient accuracy in predicting CSA-AKI.