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→Snoring Data
It's clear from reading informational material aimed at clinicians, that each manufacturer believes that they have the "best" algorithm. But what little information that has been published about independent bench trials seems to indicate that while real differences in the auto-algorithms can be quantified, the clinical significance of those differences is much harder to evaluate. This may be one reason that some sleep docs are so reluctant to prescribe APAP therapy as the first course of treatment for ordinary OSA.
== Snoring Data ==
ResMed S9s, Philips Respironics System One CPAP and DeVilbiss IntelliPAP machines record snoring data. Fisher & Paykel Icons do not record snoring data.
Notice, too, that inspiratory snoring (snoring only on inhalations) has a different wave flow than expiratory snoring (snoring only on exhalations). It's also possible to snore on both the inhalations and the exhalations; in that case the oscillations appear on both the inhalation and exhalation parts of the flow rate curve.
=='''=Snoring data on a ResMed S9'''===
Snoring data on a ResMed S9 is recorded as a function of time. At each time t, the machine assigns a "snore" number; SleepyHead graphs those "snore numbers." Here is the same Snore graph of the same 30 minutes of sleep displayed in both ResScan and SleepyHead.
'''Note:''' The S9 AutoSet and S9 VPAP Auto will react pretty aggressively to snoring. It is not uncommon to see substantial increases in pressure in response to snoring even if no OAs or Hs are being recorded.
=='''=Snoring data on a DeVilbiss IntelliPAP'''===
Snoring on an IntelliPAP is recorded as a graph with respect to time in SleepyHead. But the graph is a "square wave" graph rather than a curve. Here's a picture of a typical IntelliPAP Snore graph from SleepyHead:
=='''=Snoring data on a Philips Respironics System One'''===
'''Please note the following:''' The way snores are recorded on the ResMed S9 machines is very different than the way it is recorded on the Philips Respironics System One machines. This information applies only to the snore data recorded by the Philips Respironics System One machines and how that data is reported in both the SleepyHead and Encore software packages.
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=='''=The Snore Indices in SleepyHead and Encore'''''===
SleepyHead 0.9.6 calculates the VSnore Index shown in the left sidebar of the Daily Details data as follows:
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