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An explanation from the OPAP website.......


Posted by Barb (Seattle) on September 28, 2000 at 23:07:43:

In Reply to: OPAP Question??? posted by Bob on September 26, 2000 at 15:30:15:

Frequently asked questions.


Why doesn’t the air pressure coming in through the mouth go up out of the nose?

Just as water flows down a hill, during an inhalation air flow will seek the lowest pressure which in the respiratory system is into the lungs. Take a quick breath in, notice it goes into your lungs and not out your nose. In contrast, during exhalation a person will have air flow out the nose or through the mouth. Since obstructive sleep apnea occurs during the inspiratory phase of breathing, air flow by the OPAPâ treatment with positive air pressure goes directly into the lungs and not out the nose. Exhalation through our nose is our usual way of exhaling during sleep and is desirable since carbon dioxide is eliminated this way.




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