Diffuse lung function

Diffusion function is a measurement index of ventilation function. Used to evaluate the efficiency of alveolar capillary membranes for gas exchange. For early detection of lung and airway lesions, assessment of the severity and prognosis of the disease, assessment of the efficacy of drugs or other treatments, identification of the cause of dyspnea, diagnosis of lesions, assessment of lung function tolerance to surgery or labor intensity Tolerance and monitoring of critically ill patients have important guiding significance. Lung dispersion refers to the process of oxygen and carbon dioxide gas exchange in the lungs through the alveoli and the walls of pulmonary capillaries. Diffusion pathways include alveolar gas, alveolar capillary wall, pulmonary capillary plasma, red blood cells, and hemoglobin. The gas is exchanged along this path, depending on which end has the higher concentration, so the process can be bidirectional. The diffusion rate of oxygen is much slower than that of carbon dioxide, because oxygen is not easily dissolved in body fluids. Therefore, when the patient's diffusion function is abnormal, the exchange of oxygen is more susceptible than carbon dioxide, and the obstacles to the diffusion function of the lung can significantly affect the blood oxygen level in the clinic.