In recent years, with the gradual formation of an aging society and the improvement of people’s living standards, the incidence of chronic cardiovascular diseases (e.g., hypertension, coronary heart disease) and metabolic disorders (e.g., diabetes mellitus, hyperlipidemia, hyperuricemia) has increased significantly. Advances in medical and surgical treatment have allowed many patients with cardiovascular disease to be effectively treated in the acute phase of the disease, and there has been a marked increase in the number of patients whose disease has progressed to the end stage and who often have renal insufficiency and develop cardiorenal syndrome. Cardiorenal syndrome is a clinical syndrome that occurs when renal insufficiency is present due to heart failure. In a narrow sense, cardiorenal syndrome refers to the development of progressive renal insufficiency in patients with chronic heart failure, as evidenced by a progressive increase in blood creatinine during the course of treatment. In a broad sense, cardiorenal syndrome is a clinical syndrome in which cardiac or renal insufficiency interacts and exacerbates each other leading to a dramatic deterioration of cardiac and renal function. Cardiorenal syndrome, commonly seen in the elderly, especially in patients with chronic renal failure, hypertension and coronary artery disease, progresses very rapidly, and timely and accurate diagnosis and timely correction are required to save the heart, and kidney function.