Most patients with sleep apnea who have had a diagnosis and ventilator pressure test done at a regular hospital and wear a ventilator as prescribed by their physician do well with over 90% of them. However, there are some patients who have poorly adjusted initial ventilator pressure titration and need to repeatedly redo the manual titration and then wear the ventilator. In addition, patients who wear a ventilator should also have their airway checked. Some patients have very heavy apnea, but his own airway is wide and just collapses into a completely airtight cavity at night when he sleeps; some patients have a narrow airway that collapses to airtightness even when they sleep. Monitoring these two types of patients will reveal that the severity of apnea is the same, but who is better suited to wear a ventilator? Obviously the patient with the wide airway. In patients with wide airways, the collapsed tissues are loose and the air pressure of the ventilator can displace these tissues; in patients with narrow airways, there is very little room for tissue displacement and only a small degree of swelling can be squeezed after blood vessel congestion, which may also interfere with the venous return to the head, so such patients are not suitable for wearing ventilators and are more suitable for surgery to widen the narrow airways. Patients with severe airway obstruction but easily displaced tissues are most suitable for ventilators.