70% stenosis of the left anterior descending branch is a moderate stenosis, and it is not possible to predict what the life expectancy will be, and it is related to the degree of progression of the patient’s disease and whether it is treated in a timely manner. 1. Degree of disease development: 70% stenosis of the left anterior descending branch of the coronary artery is caused by atherosclerosis. If the patient’s disease develops quickly and symptoms such as heart failure occur, the patient’s life expectancy may be affected, and the survival time is shorter. If the patient’s condition is mild, the survival time is relatively longer. 2. Whether timely treatment: 70% stenosis of the left anterior descending branch stenosis degree is moderate, can be taken to the intervention or surgical treatment, which can extend the patient’s life. If no effective treatment is taken, the survival time will be shorter. The specific situation varies from person to person, you need to consult a doctor in time and follow the doctor’s instructions.