Ultrasonographic Airway Assessment and VIDIAC Score

The relationship between preoperative ultrasonographic airway measurements and the Videolaryngoscopic Intubation and Difficult Airway Classification (VIDIAC) score will be evaluated in adult patients undergoing videolaryngoscopic intubation. The simplified VIDIAC score classifies patients as easy (-1 or 0), moderate (1), hard (2), or severe (≥3), with higher scores indicating greater videolaryngoscopic intubation difficulty. Correlations between ultrasonographic airway measurements and the VIDIAC score will be analyzed.

The incidence of difficult videolaryngoscopic intubation will be determined using the Videolaryngoscopic Intubation and Difficult Airway Classification (VIDIAC) score. The simplified VIDIAC score is classified as follows: easy (-1 or 0), moderate (1), hard (2), and severe (≥3), with higher scores indicating greater videolaryngoscopic intubation difficulty. Patients classified as having difficult videolaryngoscopic intubation according to the predefined VIDIAC criteria will be identified, and the incidence will be calculated.

The Cormack-Lehane Grading System will be used to assess the laryngeal view obtained during videolaryngoscopic intubation. The scale ranges from Grade I to Grade IV (minimum: Grade I; maximum: Grade IV), where higher grades indicate poorer laryngeal visualization and greater difficulty with tracheal intubation. The recorded grade will be analyzed for its association with preoperative ultrasonographic airway measurements and the VIDIAC score.

The duration of videolaryngoscopic intubation, measured from insertion of the videolaryngoscope into the oral cavity until successful placement of the endotracheal tube.

The proportion of patients successfully intubated on the first videolaryngoscopic attempt without the need for additional intubation attempts.

The need for additional airway maneuvers during videolaryngoscopic intubation, including external laryngeal manipulation, repositioning, use of a bougie, stylet adjustment, or other adjunctive techniques to facilitate successful intubation.

The occurrence of oxygen desaturation during videolaryngoscopic intubation, defined as a decrease in peripheral oxygen saturation (SpO₂) below 90%.

The total number of videolaryngoscopic intubation attempts required to achieve successful endotracheal intubation. An intubation attempt is defined as insertion of the videolaryngoscope into the oral cavity with the intention of placing the endotracheal tube.