131
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→Flow Rate
Periodic Breathing can be confirmed easily on this chart and serious breathing patterns such as CSR can be identified and Flow Limits become readily apparent.
=====Issue - Positional Apnea (Chin tucking)=====
[[File:Severe Positional Apnea FL Closeup.png|800px]]
=====Issue - Various (Flow Limitation, Snoring, Mouth Breathing)=====
[[File:Flow limitation images zpsdb148d1f.jpg]]
=====Issue - Preiodic Breathing (CSR, PB)=====
Note: ResMed (incorrectly) labels all periodic breathing as CSR.
All Periodic Breathing should be viewed in a zoomed view to identify its properties.
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 back ground 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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[[File:PB_zpsee6cff1e.png]]
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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). 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.
''Detecting Periodic Breathing on other CPAPs''
Once you know what PB looks like, you can often spot suspicious patterns by simply scrolling through the Flow Rate data in with a 5-10 minute window. Any periodic waxing/waning patterns will be show up at that magnitude. Whether this is worth doing on a regular basis is another question altogether. Unless you have a co-morbid condition that is associated with PB (such as congestive heart failure), PB is not something you need to spend much time worrying about or trying to locate in your data.
Here's an example of PB that may be CSR pulled from a ResMed machine:
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[[File:CSR-example_zpsee76d5af.jpg]]
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====Pressure====
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