National Sleep Foundation

Glossary

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Obstructive Sleep Apnea Syndrome (OSAS) - The most common form of sleep apnea. OSAS occurs when the person’s airway collapses or is blocked, which causes shallow breathing (or pauses in breathing) and disrupts sleep.

Occlusal appliances - Devices, such as soft mouth guards or stabilization splints, that are designed to protect the mouth and prevent Sleep-Related Bruxism’s negative outcomes.

Opioids - A class of drugs used for pain management, such as codeine, oxycodone, and morphine.

Oral Appliances - Devices used to treat obstructive sleep apnea that move the tongue or lower jaw forward to increase the size of the upper airway, and facilitate breathing.

Oxygen Desaturation Index (ODI) - Used to assess severity of sleep apnea, the index measures the number of times per hour the person’s oxygen saturation falls by 3 or 4 percent, or the time spent with saturations below 90 percent.