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2. Hypopnea - Wikipedia

   en.wikipedia.org/wiki/Hypopnea

   However, this closure is still enough to cause a physiological effect i.e., an oxygen desaturation and/or an increase in breathing effort terminating in arousal. A Hypopnea Index (HI) can be calculated by dividing the number of hypopnea events during the sleep period by the number of hours of sleep.

3. Apnea–hypopnea index - Wikipedia

   en.wikipedia.org/wiki/Apnea–hypopnea_index

   Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both the number of sleep breathing disruptions and the degree of oxygen desaturation (low oxygen level in the blood) during said disruptions. The AHI is calculated by dividing the number of apnea events by the number of hours of sleep.

4. Hypoxemia - Wikipedia

   en.wikipedia.org/wiki/Hypoxemia

   Central sleep apnea. During sleep, the breathing centers of the brain can pause their activity, leading to prolonged periods of apnea with potentially serious consequences. Hyperventilation followed by prolonged breath-holding. This hyperventilation, attempted by some swimmers, reduces the amount of carbon dioxide in the lungs.

5. Sleep and breathing - Wikipedia

   en.wikipedia.org/wiki/Sleep_and_breathing

   Sleep apnea (or sleep apnoea in British English; /æpˈniːə/) is a sleep disorder characterized by pauses in breathing or instances of shallow or infrequent breathing during sleep. Each pause in breathing, called an apnea, can last for several seconds to several minutes, and may occur 5 to 30 times or more in an hour.

6. Respiratory disturbance index - Wikipedia

   en.wikipedia.org/wiki/Respiratory_disturbance_index

   The respiratory disturbance index (RDI)—or respiratory distress Index—is a formula used in reporting polysomnography (sleep study) findings. Like the apnea-hypopnea index (AHI), it reports on respiratory distress events during sleep, but unlike the AHI, it also includes respiratory-effort related arousals (RERAs). [1]

7. Periodic breathing - Wikipedia

   en.wikipedia.org/wiki/Periodic_breathing

   Periodic breathing during sleep occurs typically in adult patients with congestive heart failure. Periodic breathing is also a normal variation of breathing found in premature and full term infants. It occurs when the infant has pauses in breathing for no more than 10 seconds at a time followed by a series of rapid, shallow breaths. Then the ...