Pain Assessment in Children With Cerebral Palsy Through Parasympathetic Tone Analysis.

"The Analgesia Nociception Index (ANI, MDoloris Medical Systems, Lille, France), based on Heart Rate Variability analysis, measures continuously and non-invasively the influence of Respiratory Sinus Arrhythmia on the heart rate. This 0-100 index indicates the proportion of paraS over sympathetic activity. In adults during surgery under general anesthesia, ANI decreases after painful stimulation and has been related to the balance between analgesia and nociception.~ANI is calculated from heart rate recording."