Causes of physical expectoration

With the development of the disease, especially frequent acute attacks, the patient's lung function is declining. The decline of respiratory function is mainly the decline of expiratory function. Once the respiratory function declines, the residual gas (carbon dioxide) produced by human metabolism will stay in the lungs and occupy the normal breathing space, resulting in a decrease in the total amount of oxygen in the lungs and a corresponding decrease in the oxygen exchanged to the blood circulation system, resulting in human hypoxia. Symptoms include blue lips, dull nails, chest tightness and wheezing. In severe cases, life is still in danger. In fact, this is the same as the storage of goods. There is more carbon dioxide in the alveolar warehouse, and the corresponding oxygen storage is less. If you want to load more oxygen, wouldn't it be best to remove all the carbon dioxide? Solve carbon dioxide retention, so as to avoid hypoxia and panting. In short, there will be no lack of oxygen without residual gas!