Changes

The DeVilbiss IntelliPAP does NOT record Flow Rate data.

This graph is probably the most used in analyzing and interpreting CPAP data. It shows airflow in and out of your lungs throughout the night. The flow above the zero line is inhalation and below the line is exhalation. The events are shown on this graph as well as on the event flags graph. You can zoom in to examine an event more closely.

Placing the cursor on any event will create a small pop-up detailing the type and duration of the event in seconds.

Nearly all that is happening throughout the night can be seen in the Flow Rate graph though usually in a zoomed view. Tidal Volumes and Minute Vent can be seen via the 'volume under the curve', flow limits may show as "grassy" on the full night view but are readily apparent when viewed with the breath waveform is readily distinguished, typically 2-3 minutes. Leaks may sometimes be distinguished by a difference in volume between inhale and exhale.

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====Issue - Positional Apnea (Chin tucking)====

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====Issue - Arousal/Recovery Breathing====

additional examples are in the above sections<br />

Philips Respironics machines flag breathing that meets their definition of ''periodic breathing'' (PB). On the Philips Respironics web pages, PB is defined as "Periodic breathing is defined as alternating periods of hyperventilation with waxing/waning tidal volume..." Typically the waxing and waning pattern must be quite regular in visual appearance and it must present for at least a minute or two for PB to be scored. PB is flagged with a green background on the flow rate data. Often, but not always, there will be CAs (or Hs or sometimes OAs) scored at the nadir of the cycle. Sometimes the System One will only flag the most obvious part of the cycle:

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A bit of PB now and then is nothing to worry about. However, there is one form of PB that is called Cheyne-Stokes Respiration (CSR) that is clearly associated with some forms of heart disease, including congestive heart failure. CSR is very regular and has a CA at the nadir of the cycle (although the CA may be mis-scored as an OA or a UA). If you have serious heart disease and you see a lot of PB scored in your flow rate data, it is worth mentioning it to your cardiologist as well as your sleep doctor.

Here's an example of PB that may be CSR pulled from a ResMed machine:

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====Issue - PLM (Periodic Leg Movement====

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====Issue - Various (Flow Limitation, Snoring, Mouth Breathing)====

=====Classes of inspiratory flow shapes=====

====Additional Info - Flow Limitation/UARS and BiPAP====