CPAP ventilators can correct intermittent nocturnal hypoxia and also improve sleep architecture, thus providing effective treatment for the organism damage and complications that arise from sleep apnea. Respiratory system: In addition to eliminating nocturnal respiratory disturbances, continuous positive airway pressure ventilation also has an effect on daytime blood gas disturbances. It can increase blood oxygen, decrease carbon dioxide, restore the acidity of blood and lower pulmonary artery pressure. It also improves the sensitivity of the respiratory center and enhances the tone of respiratory muscles in some patients with sleep apnea syndrome. Cardiovascular system: Continuous positive airway pressure ventilation can correct some of the arrhythmias caused by sleep apnea syndrome, lower blood pressure, and improve cardiac function. However, if the continuous air pressure is too high, it will also significantly lower the patient’s blood pressure. Therefore, when the patient has pathological hypotension, such as shock, massive application of diuretics, and inability to eat and drink, the changes in blood pressure and heart rate need to be closely observed when the ventilator is applied. Digestive system: Sleep apnea is often combined with gastroesophageal reflux disease. Continuous positive airway pressure ventilation can reduce the number of reflux, reduce the stimulation of acid to the esophagus, and improve the symptoms of esophageal reflux. Urinary system: Sleep apnea often causes patients to urinate frequently and increase the number of times they get up at night due to the effect of plant nervous disorder. Continuous positive airway pressure ventilation can reduce the increase of urine volume caused by sleep apnea syndrome and reduce the number of urination at night. Hematological system: Continuous positive airway pressure ventilation can reduce erythropoiesis and increase blood volume in patients with sleep apnea syndrome, thus reducing the content of blood erythrocytes and decreasing the viscosity of blood. Neuropsychiatric system: Continuous positive airway pressure ventilation treatment can improve the blood and oxygen supply to the brain of patients with sleep apnea syndrome, so that their memory, reaction ability, executive ability and other brain functions can be restored. Endocrine metabolic system: Continuous positive airway pressure ventilation eliminates hypoxia and sleep disorders in patients with sleep apnea syndrome, and has a wide range of effects on the endocrine metabolic system of the organism, the more obvious being the restoration of normal growth hormone secretion and the enhancement of sexual function in male patients. Continuous positive airway pressure ventilation has been widely used since the early 1980s and has a history of more than thirty years. Since the beginning of its application, medical practitioners have paid great attention to its side effects, and the results of a large number of studies have shown that continuous positive airway pressure ventilation does not have serious adverse effects on the organism.