-100-
The sleep FFT analysis is also used to determine Microarousals (MA).
There are two methods for determining Microarousals:
a)
MA from AFV
- Detection of frequency increases in the EEG (cortical arousal), increase in
AFV (Average Frequency Value)
b)
MA from Sigma
– Detection of increase in Sigma frequency band
Cortical Microarousal
1)
Min. MA Duration [s]
Minimum duration of an increase in AFV curve to determine MA.
2)
Increase [Hz]
Minimum increase of the AFV curve (to determine MA).
3)
Treshold [Hz]
In this field, the upper limit for the start of an increase is defined, i.e. all increases starting above this
threshold will not be considered when determining MAs.
fig. 7-13: AFV Curve Determined by Sleep FFT Analysis
*
Note: The AFV Curve in the analysis window is displayed smoothed.
4)
BL min. duration [s]
Before the AFV curve increases, it must be constant for a time (attention to the Max AFV variation), for
a MA to be present.
5)
BL Variation [Hz]
Maximum acceptable fluctuation of the AVF curve before a MA.
Sigma Increase
Increase [µV]
Minimum increase of the Sigma curve to determine a MA (
“Min. MA Duration”
criteria has also to
apply).
1
[s]
2
[Hz]
3
[Hz]
AFV Curve*
Содержание SOMNOwatch plus
Страница 24: ...24 Body Temperature fig 6 8 Montage Temperature EDA fig 6 9 Montage EDA...
Страница 25: ...25 Sleep Profile fig 6 10 Montage Sleep Profile ECG Analysis fig 6 11 Montage ECG...
Страница 26: ...26 Training Rehab fig 6 12 Montage Training Rehab Flow Snore fig 6 13 Montage Flow Snore...
Страница 42: ...42 Body Temperature fig 6 22 Analysis Template Temperature EDA fig 6 23 Analysis Template EDA...
Страница 43: ...43 Sleep Profile fig 6 24 Analysis Template Sleep Profile...
Страница 45: ...45 Flow Snore fig 6 27 Analysis Template Flow Snore CPAP Control fig 6 28 Analysis Template CPAP...
Страница 63: ...63 Choose the item Activity profil within the Select Report window...
Страница 72: ...72 recording on both legs...
Страница 162: ...162 10 9 Notes...
