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Sleep related terms

- O -

  • O2

  • Chemical symbol for oxygen. Criterion lowest percent O2 saturation: Greater than 85%=mild, 80% to 85%=moderate, less than 80%=severe

  • Obesity Hypoventilation Syndrome

  • Term applied to obese individuals hypoventilating during wakefulness.

  • Obstructive apnea

  • Cessation of airflow (at least 10 seconds) in the presence of continued inspiratory effort; cessation of breathing during sleep, due to a mechanical obstruction, such as a semi-collapsed trachea, tongue relaxed to back of the throat, or a large among of tissue in the uvula area.

  • Obstructive Hypopnea

  • Periodic and partial closure of the throat during sleep resulting in reduced air exchange at the level of the mouth and/or nostril.

  • Ondine's Curse

  • The respiratory center in the brain is unable to stimulate breathing in response to an increased amount of carbon dioxide in the blood. Ondine's Curse or central alveolar hypoventilation typically worsens during sleep.

  • Optimum Sleep

  • Average amount of sleep needed every night by an individual.

  • Oximeter (Pulse)

  • Gives estimates of arterial oxyhemoglobin saturation (SaO2) by utilizing selected wavelengths of light to non invasively determine the saturation of oxyhemoglobin (SpO2)

  • Oximetry (Pulse)

  • Continuous monitoring of oxygen saturation of arterial blood from a pulse oximeter; the sensor is usually attached to the finger.

  • Oxygen Desaturation

  • Less than normal amount of oxygen carried by hemoglobin in the blood; values below 90% are considered abnormal

  • Oxygen Saturation

  • Measure of oxygen carried by hemoglobin in the blood. Normal values 90%100%.

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Sleep Related Terms

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