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Auto CPAP or APAP Machines. Similar to the CPAP machine, auto adjusting or APAP machines automatically calculate a patientâs required pressure and adjust to a comfortable level without any pre-set programming. These machines are ideal for patients who have various pressures during the night.
How CPAP works. A CPAP machine forces a continuous column of compressed air at a fixed designated pressure against the face and nose of the patient, who is wearing a mask or nasal cap. When the patient's glottis opens to inhale, the pressure is transmitted throughout the airway, helping to open it.