CPAPS a individually adjusted for each patient, i.e. pressure needed to trigger the airflow increase, levels of increase etc. This is a medical device that is highly individualized. You can't just go out and self diagnose and rent one.

The racing heart and sweating that often accompany an abrupt wake up from the adrenaline rush of an apnea event are most of the time mis diagnosed by the medical community as anxiety disorder. This is a hugely under diagnosed issue in an America that is over weight. But it is also grossly under diagnosed in head and neck cancer patients. This isn't a matter of losing some sleep, long term untreated apnea will shorten your life span. Most people don't even know that they have it, but being tired all the time during the day is a dead give away. Before I was diagnosed, I was having 13 event an hour. None of which except four major ones a night woke me up fully.

In head and neck patients with chronic mucous flow combined with the anatomical changes in the area around the opening to the trachea, a cpap machine many not be successful in resolving the problem.