Prediction of Postoperative Pain by Nociception Monitoring

After the end of surgery (defined as the time of skin closure or wound dressing), but before awakening (BIS will still be \< 60), SPI, PPI and NOL are recorded in a quiet setting without any other stimulation. Within the five minutes data acquisition period nociception indices are recorded every minute (T0, T1, T2, T3, T4, T5). The highest SPI, PPI and NOL are used for further analysis.