Coronary heart disease is one of the diseases that threaten the health of middle-aged and elderly people in contemporary times, and is the primary cause of death in this age group. Cold can cause blood vessels to constrict, increase blood viscosity, increase coronary artery vascular resistance, reduce coronary blood flow, cause myocardial ischemia and hypoxia, and make it easy for venous thrombosis to occur subsequently, thereby increasing the risk of myocardial infarction and sudden cardiac death. Therefore, patients with coronary heart disease...