NPPB and heart failure: The distribution of TCM syndrome will also be evaluated by NYHA classification, results from an electrocardiogram (ECG), cardiac ultrasound interpretation, and biochemical parameters from routine blood tesst such as NT-proBNP, urine test, etc. Other outcomes include: (1) the distribution of TCM syndrome patterns in heart failure patients; (2) the correlation between TCM syndrome patterns and the severity of heart failure and (3) the dynamic changes between biomedical parameters and the TCM syndrome patterns of heart failure, etc.