Chronic pulmonary heart disease is a heart disease caused by chronic bronchitis, emphysema, other chest diseases and pulmonary vascular lesions. Chronic bronchitis and emphysema as the main causes of chronic pulmonary heart disease have been recognized by the medical profession, and there is a trend of higher incidence in northern areas and cold regions. Chronic bronchitis and emphysema are still the main causes of chronic chronic pulmonary heart disease. Since the occurrence and development of chronic bronchitis and emphysema are closely related to factors such as respiratory tract infections from smoking, smoking cessation and prevention of upper respiratory tract infections are important measures to reduce the incidence of chronic pulmonary heart disease and stop the development of the disease. Chronic pulmonary heart disease mostly occurs in elderly patients, because the function of all important organs in the body of elderly patients are reduced, so the clinical manifestations are often not typical, and the condition is often aggravated by repeated attacks due to infection, easy to combine multiple organ damage, in which cough and lung wet rales are the main symptoms and signs, coughing up sputum with white mucous sputum is common, fever is mainly low to moderate fever, half of the patients do not have elevated white blood cell count, but neutrophil The ratio of neutrophils to white blood cells is commonly increased. 1, long duration of disease, degenerative lung structure, lung function, combined with a variety of underlying diseases; 2, the body’s immune function is reduced, insensitive to the inflammatory response; 3, the elderly lung infections are mainly gram-negative bacteria, anaerobic bacteria and other factors related. The treatment of chronic pulmonary heart disease, in addition to actively taking measures to control infection, improve ventilation, controlled oxygen therapy, correct acid-base imbalance and electrolyte disorders, etc., reasonable nutritional support therapy is also an important part of the treatment, research shows that malnutrition can lead to a decrease in the immunity of the patient’s body, easy to incur infection or lead to infection is not easy to control, and malnutrition is easy to cause or aggravate respiratory muscle fatigue, thus causing or aggravating respiratory failure . Mechanical ventilation treatment can improve simultaneous and oxygenation, correct hypoxemia and hypercapnia, reduce respiratory muscle work, and facilitate the recovery of fatigued respiratory muscles, which can effectively control and alleviate the multi-organ functional damage caused by respiratory failure and buy the necessary time for treatment.