Actiheart User Manual 5.1.31 (Jun 2022)
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6.5 Apnoea
Screening
Clicking on the ‘Apnoea Screening’ tab automatically performs a frequency
domain analysis of the cardiac inter-beat interval increment of the recording.
This analysis extracts the Very Low Frequency components of the IBI as shown
in the results below:
The Apnoea screen is divided into three sections:
a.
Top section.
This shows the parameters of the chosen recording namely
those for the user and those for the start and finish times of the recording.
b.
Second section.
This shows the activity data in black and the heart rate
data in red for the duration of the recording. The scale of these can be
adjusted using the sliders to either side of this display.
c.
Third section
.
The ‘Analysis Results’ window shows a power spectral
analysis of the heart rate variability data, with the Very Low Frequency
component highlighted in red and the low and high frequency in light blue.
The %VLFI is the percentage of very low frequency power spectral
density on the total power spectral spectral density, which has been
identified as a well-suited variable for screening patients with obstructive
sleep apnoea.*
*
For further details, see Frederic Roche et al.,
Cardiac Interbeat Interval
Increment for the Identification of Obstructive Sleep Apnoea
, Journal of Pacing
and Clinical Electrophysiology, Vol. 25, No. 8, August 2002, pp. 1192-1199.
