Head-elevated laryngoscopy position: improving laryngeal exposure during laryngoscopy by increasing head elevation

Area of Science:

• Anesthesiology and airway management.
• Anatomical studies of the head and neck.

Background:

• Direct laryngoscopy is a critical procedure for airway management.
• Optimizing the laryngeal view is essential for successful intubation and reducing complications.
• Current positioning techniques may not always provide an optimal view.

Purpose of the Study:

• To investigate the impact of increasing head elevation and neck flexion on the quality of the laryngeal view during direct laryngoscopy.
• To quantify the changes in laryngoscopy angle and the percentage of glottic opening (POGO) score with varying head positions.

Main Methods:

• Direct laryngoscopy using a straight blade was performed on 7 fresh human cadavers.
• Laryngeal views were recorded, and the laryngoscopy angle was measured using an angle finder.
• Cadavers were positioned with the head flat, in a mid-position, and in a fully head-elevated position, increasing neck flexion.
• Three blinded physicians graded the laryngeal view quality using the POGO score.

Main Results:

• The laryngoscopy angle significantly increased from 32° (head flat) to 67° (head elevated).
• Mean POGO scores significantly improved from 31% (flat) to 64% (mid) to 87% (elevated).
• All observed increases in POGO scores across positions were statistically significant (P < .0001).

Conclusions:

• Increasing head elevation and neck flexion demonstrably enhances the laryngoscopy angle.
• Improved laryngoscopy angles directly correlate with significantly better laryngeal visualization, as indicated by higher POGO scores.
• These findings support the use of head elevation techniques to optimize laryngeal view during laryngoscopy.