This study aims to evaluate the effect of Conox (qCON/qNOX)-guided anesthesia on intraoperative anesthetic drug consumption and postoperative outcomes in pediatric patients undergoing adenotonsillectomy. Conox is a non-invasive EEG-based monitoring system that provides indices of both hypnosis and nociception.

In this randomized controlled trial, children aged 3-12 years will be assigned to either a Conox-guided anesthesia group or a standard monitoring group. The primary outcome of the study is total intraoperative opioid consumption, assessed from anesthesia induction to the end of surgery. Secondary outcomes include emergence time, extubation time, postoperative agitation, pain scores, and correlation between qCON/qNOX values and hemodynamic parameters.

This randomized controlled trial is designed to investigate the impact of Conox (qCON/qNOX)-guided anesthesia on anesthetic management and clinical outcomes in pediatric patients undergoing adenotonsillectomy. Conox is a non-invasive EEG-based monitoring device that simultaneously provides indices of hypnotic depth (qCON) and nociception (qNOX), allowing for more precise anesthetic titration.

A total of 128 children aged 3-12 years with ASA physical status I-II scheduled for elective adenotonsillectomy will be enrolled. Participants will be randomized into two groups using a sealed envelope method. In the Conox group, anesthetic depth and analgesic administration will be guided by qCON and qNOX values in addition to standard monitoring. In the control group, anesthesia will be managed using conventional clinical parameters such as heart rate and mean arterial pressure.

All patients will receive a standardized anesthesia protocol including propofol, fentanyl, rocuronium for induction, and sevoflurane for maintenance. The primary outcome of the study is total intraoperative opioid consumption, assessed from anesthesia induction to the end of surgery. Secondary outcomes include emergence time, extubation time, postoperative agitation, pain scores, and correlation between qCON/qNOX values and hemodynamic variables.

The study aims to determine whether Conox-guided anesthesia can optimize anesthetic drug use, improve postoperative recovery, and enhance patient safety in pediatric anesthesia practice.

Inclusion Criteria:

Children aged 3 to 12 years ASA physical status I-II Scheduled for elective adenotonsillectomy No acute infection or systemic disease Parent or legal guardian able to provide written informed consent

Exclusion Criteria:

Skin lesions or anatomical abnormalities preventing placement of EEG electrodes History of neurological disease, including epilepsy or neurological syndromes Body mass index above the 95th percentile for age Previous pharyngeal surgery History of anesthesia-related complications Absence of written informed consent from a parent or legal guardian