In general, 80-year-old patients with coronary artery disease have different survival times depending on the severity of the disease. Patients with mild disease generally do not affect life expectancy, while patients with severe disease have a lower survival rate and may even die suddenly. Coronary heart disease is the most common cardiovascular disease. If the disease is detected in time and under strict standardized clinical treatment, the survival rate of coronary artery disease is very high, and the life expectancy of patients is generally not affected. However, in critically ill patients, the survival rate is greatly reduced due to the long-term depletion of the disease, the patient’s tolerance for therapeutic means (e.g., percutaneous coronary intervention, etc.) decreases, and the patient’s likelihood of acute coronary syndromes is elevated. When a diagnosis of coronary artery disease is made, the patient needs to actively cooperate with treatment and follow medical advice.