How does CPAP improve breathing in the patient with OSA?
a. Stimulation of the phrenic nerve
b. Pneumatic splinting of the upper airway
c. Stimulation of upper airway muscles
d. Repositioning of the epiglottis
ANS: B
CPAP therapy is believed to work by splinting the upper airway open, thus raising the intralu-minal pressure of the upper airway above a critical transmural pressure of the pharynx and hypo-pharynx that is associated with airway closure.
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