Combined use of Bispectral Index™ and A-Line™ Autoregressive Index™ to assess anti-nociceptive component of balanced anaesthesia during lumbar arthrodesis

During a BIS-guided constant level of hypnosis, AAI response to the onset of surgical stimulation significantly differs according to the analgesic regimen. Further studies are needed to refine the estimation of sensitivity and specificity of this variable in assessing the balance between nociception and anti-nociception during general anaesthesia.