The life expectancy of a diabetic patient with complications is closely related to the patient’s blood glucose level and the severity of the complications. For example, if a diabetic patient has mild retinopathy or neuropathy, this complication will not have much effect on the patient’s life expectancy, but if a diabetic patient has renal disease, or even renal insufficiency or uremia, and needs dialysis treatment, the patient’s life expectancy will be relatively poor. If diabetic patients suffer from cardiovascular and cerebrovascular complications, such as coronary artery disease, angina pectoris, cardiac infarction or cerebral infarction, life expectancy will also be affected, and severe patients may cause sudden death.