Health & The Human Body Factoid #25: 'Hypopnea' comes from Greek: 'hypo' meaning 'beneath' or 'less than normal' and 'pnea' meaning 'breath.' A hypopnea is not a complete cessation of breath but can be defined as a perceptible reduction in airflow that leads to sleep fragmentation or to a decrease in the oxygen level in the bloodstream.
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