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The following 2 entries include the term positive airway pressure.
bilevel positive airway pressure
noun: a technique that is used for relieving breathing problems (such as those associated with sleep apnea or congestive heart failure) by pumping a flow of air through the nose to prevent the narrowing or collapse of air passages or to help the lungs expand and that differs from continuous positive airway pressure by pumping air at a reduced pressure during each exhalation —abbreviation BiPAP, BIPAP, BiPap, BPAP, BPap
continuous positive airway pressure
noun: a technique for relieving breathing problems (such as those associated with sleep apnea or congestive heart failure) by pumping a steady flow of air at constant pressure through the nose to prevent the narrowing or collapse of air passages or to help the lungs to expand —abbreviation CPAP compare bilevel positive airway pressure
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Merriam-Webster unabridged
