Elevated B-type natriuretic peptide often indicates the presence of heart failure, but it is not very specific, and may also be due to severe inflammatory infections, renal insufficiency, tumors, and sometimes in elderly patients. To further clarify the diagnosis, the actual clinical symptoms of the patient should be taken into account and further relevant tests should be performed. For example, if the patient has dyspnea, shortness of breath, wheezing, and seated breathing, it is highly considered to be caused by heart failure, and if it is accompanied by high B-type brain natriuretic peptide and abnormal cardiac ultrasound, it is highly confirmed to be heart failure rather than respiratory failure. There are some patients who do not have obvious symptoms, but simply have elevated this index, it is recommended that blood tests and kidney function should be performed to see if it is caused by renal insufficiency.