OSCAR temporary glossary page
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All the definitions on this page have been removed from the main OSCAR Help page. Not sure why they were there or whether all this material belongs in the main glossary.
AHI The Apnea–Hypopnea Index (AHI) is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea and hypopnea events per hour of sleep. The apneas (pauses in breathing) must last for at least 10 seconds and are associated with a decrease in blood oxygenation. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both number sleep disruptions and degree of oxygen desaturation (low blood level). The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. With AHI, a lower number is better; any number under 5.0 is ideal. Your AHI number displayed in DreamMapper will fluctuate and change every day based on your breathing the night before. The AHI number displayed in DreamMapper will fluctuate and change every day based on your breathing the night before. Your goal is to obtain an AHI as close to 0.0 as possible. Any number under 5.0 is ideal
Unclassified Apnea
Obstructive An apnea is detected when there is an 80% reduction in airflow from a baseline for at least 10 seconds if there is no airflow detected for 10 seconds. During the apnea, one or more pressure test pulses are delivered by the device. The device evaluates the response of the patient to the test pulse(s) and assesses whether the apnea has occurred while the patient has a clear airway or an obstructed airway. The airway is determined to be clear if the pressure test pulse generates a significant amount of flow; otherwise the airway is determined to be obstructed. When the airway is obstructed then an Obstructed Airway Apnea event is recorded.
What is a Hypopnea? An episode of overly shallow breathing or an abnormally low respiratory rate. Our auto algorithm establishes a baseline of patient flow based on a moving flow signal window. When your device detects a hypopnea as a 40% reduction in flow lasting at least 10 seconds, followed by a recovery breath, then a Hypopnea event is recorded.
What is an Apnea?
An apnea is a pause in breathing, lasting 10 or more seconds.
Clear Airway or Central Apnea? An apnea is detected when there is an 80% reduction in airflow from a baseline for at least 10 seconds if there is no airflow detected for 10 seconds. During the apnea, one or more pressure test pulses are delivered (PR) by the device. The device evaluates the response of the patient to the test pulse(s) and assesses whether the apnea has occurred while the patient has a clear airway or an obstructed airway. The airway is determined to be clear if the pressure test pulse generates a significant amount of flow; otherwise the airway is determined to be obstructed. When the airway is clear then a Clear Airway Apnea event is recorded.
Event Definition Apnea, Hypopnea, Flow Limitation Apnea: 80% to 100% reduction in airflow for >= 10 seconds Hypopnea: 50% to 80% reduction in airflow for >= 10 seconds Flow Limitation: <50% reduction in airflow for >= 10 seconds
Large Leak Philips CPAPs tolerate up to twice the intentional leaks. They compensate for this leak by adjusting the speed of the blower. Beyond the tolerance threshold, the DreamStation indicates that its detection is not reliable in terms of the increased level of non-intentional leaks. It then qualifies these leaks as large -->
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