Determinants of Rescue Ventilation Requirement in Airway Surgery Under General Anesthesia With THRIVE

The primary outcome is the time from the start of apnea to the initiation of rescue ventilation, defined as the point when oxygen saturation (SpO₂) falls to 92% or below during airway surgery under general anesthesia with Transnasal Humidified Rapid-Insufflation Ventilatory Exchange (THRIVE). This will be measured using continuously recorded intraoperative data. The aim is to identify clinical predictors (e.g., anatomical and physiological variables) associated with the need for rescue ventilation.

This outcome measures the lowest oxygen saturation (SpO₂) observed after the initiation of rescue ventilation during airway surgery with THRIVE under general anesthesia. Data will be extracted from intraoperative monitoring records.

This outcome measures the time interval from the start of rescue ventilation to the recovery of oxygen saturation (SpO₂) to 100%. The measurement will help evaluate the efficacy of rescue ventilation in restoring oxygenation.

This outcome records the end-tidal carbon dioxide (EtCO₂) level at the moment rescue ventilation is initiated. It aims to assess the extent of CO₂ retention during apnea and its relationship to the timing of rescue ventilation.

This outcome involves analysis of patient anatomical and physiological factors (e.g., Mallampati class, thyromental distance, neck circumference, presence of retrognathia) to determine their association with the need for rescue ventilation during THRIVE-supported airway surgery.