Spacelabs Healthcare 98000, Operation Manual

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Pathfinder SL v1.9 Operations Manual
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These “AHI” values are the definitions usually used for sleep disturbance in polysomnographic
tests.
Please note that Pathfinder SL gives estimates of these values, which may differ from the “true”
AHI that would be obtained from a polysomnogram under identical conditions.
The legend above each sleep period on the graph shows the Sleep Period Number followed by
the mean Estimated AHI.
EDR: Estimated Dervied Respiratory.
The EDR graph values is derived from the sleep apnea algorithm, it is intended to approximate
the signal from a direct respiration measurement device. Zoom into the EDR to see breathing
cycles. From this it is possible to detect changes in the volume of respiration and therefore
to correlate it with other apnea areas of normal vs. abnormal breathing. Depending on the
recording, it may also be possible to note the relative timing of heart-rate changes and breathing.