Hypopnea is a medical term for abnormally shallow breathing or slow respiratory rate. This differs from apnea in that there remains some flow of air. Hypopnea comes from the Greek roots hypo- and pnoe . Literally it means underbreathing. In the diagnosis and treatment of sleep disorders, a hypopnea event is not considered to be clinically significant unless there is a 50% reduction in flow and an associated 3% desaturation...
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