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The GoodKnight® 425ST Bi-Level® device offers the same benefits as our GoodKnight 425 Bi-Level device with the added benefit of a backup rate that delivers a machine-triggered breath in the event of apnea or hypopnea. Thanks to a patented turbine-based blower, the GoodKnight 425ST Bi-Level device is whisper-quiet and comfortable for obstructive sleep apnea patients to use. It's also conveniently small and lightweight, making the GoodKnight 425ST Bi-Level device perfect for use at home, on the road or in clinical settings. Sleep laboratories using Puritan Bennett's Sandman® sleep diagnostic sys
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