Elderly people with respiratory failure will affect the ventilation and exchange of air in the lungs, which will lead to hypoxia and carbon dioxide retention, causing chest tightness, shortness of breath, dyspnea, accompanied by coughing, fever, coughing up sputum. More serious symptoms will affect the heart to cause pulmonary heart disease, which will show accelerated heart rate, heart failure, and even serious enough to cause neurological disorders, which will lead to coma, convulsions and other symptoms. If it becomes more and more serious, the patient will have involuntary respiration, and there will be cyanosis of the lips and mouth, pallor, coldness and cyanosis at the ends of the limbs. It tends to cause profuse sweating, there will be profuse sweating, there will be sigh-like breathing, phlegmatic sounds will also be heard, and the pupil’s light reflex will be weakened or disappear.