MD/PRD/IN16.ANIMOC9 V.02 - 12/03/2020
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ANI index
We have developed calculation algorithms based on the amplitude measurement of the
respiratory modulation of RR interval time series.
A continuous index is displayed (each basic measurement is performed on 64 seconds of
data with a sliding window every second) that reflects the parasympathetic tone of the
patient. A calculation is made every second and then averaged over two time periods: a
short average (average on 56 seconds) and a longer average (average on 176 seconds).
The Root monitor displays two parameters: the orange one is the value of the longer average
(marked as “m”) and the yellow one is the instantaneous ANI (marked as “i”), resulting from
the short average. These indexes can anticipate a hemodynamic reactivity during the
nociceptive stimuli. “.