Can a monitor read pain in sleeping kids?

This study tested whether a non-invasive monitor called the Nociception Level (NoL) index can measure pain in children under general anesthesia. Researchers gave 30 children aged 5 to 12 brief, mild electrical stimulations of different strengths before surgery and recorded how the NoL index changed. The goal was to see if the monitor responds to pain signals in children the same way it does in adults.