Pulmonary failure is a more critical state of respiratory failure, mainly due to a series of physiological and pathological syndromes of the body caused by pulmonary ventilation function and pulmonary ventilation dysfunction, such as chest tightness, wheezing, shortness of breath, and even self-consciousness of not being able to get air up, and patients will have a sense of fear. The main cause of pulmonary failure is pulmonary diseases, such as asthma, chronic obstructive pulmonary disease, interstitial fibrosis, pleural effusion, pneumothorax, and all of the above causes can cause respiratory failure, i.e. pulmonary failure.