- 31 -
2)
Min. Signal
Minimum value of the signal. An artefact will be detected as soon as the signal falls below this value.
3)
Min. Duration [s]
Minimum duration for an Apnoea or Hypopnoea.
4)
Max. Duration [s]
Maximum acceptable duration for an Apnoea or Hypopnoea.
5)
Apnoea Ratio [%]
The Apnoea ratio
states the fractional flow relative to the baseline. All values below this ratio are
detected as Apnoea.
6)
Hypopnoea Ratio [%]
Hypopnoea ratio
states the fractional flow relative to
the baseline. All values below this ratio and
above the Apnoea ratio will be detected as Hypopnoea (also refer to section 12 on Correlation).
7)
Central A: central part [%]
(A: Apnoea)
This value indicates to what extend effort and flow events have to overlap in order to be identified as a
Central Apnoea. For example: If more than 50 % of an Apnoea in the flow channel is overlapped by an
effort event it will be scored as a Central Apnoea.
8)
Mixed A: central part [s]
(A: Apnoea)
Where no central apnoea is detected but an Apnoea and an effort event overlap for at least 4
seconds, a mixed apnoea will be scored.
9)
% Snore time
If the percentage of snoring, during an apnoea phase, exceeds this value, a hypopnoea will be
detected.
10)
Body position correlation [s]
With this function the correlation of a flow event is checked with body position change. The adjustable
delay gives the maximum time between a Flow event and a body position change.
11)
Editing option
Here you can define for which manually edited event arousals should be displayed automatically.
12)
Correlation
This function checks the correlation of the
Apnoea
and
Hypopnoea
events to desaturations. It is used
as additional criterion to detect Apnoea and Hypopnoea. It is also possible to define the
Delay
for the
correlation.
Fig. 6.10: Flow Analysis Correlation
This delay will indicate the maximum time interval between the end of one Apnoea/Hypopnoea and
the end of a correlating Desaturation (
1
).
Summary of Contents for SOMNOtouch RESP eco
Page 54: ...54 9 11 Notes...
