Both the extended neck position and insertion of a supraglottic airway device increases the height of the cricothyroid membrane in females. A prospective observational study
Authors' conclusion
Both neck extension and the insertion of an i-gel® increased the sagittal height of the CTM.
Study context
- Population
- Adult females having minor gynaecological surgery under GA, suitable for an supraglottic airway device (SAD)
- Participants
- 40 females · 160 images
- Exposure
- Neutral vs extended neck position, before and after i-gel® insertion
- Outcome
- Sagittal cricothyroid membrane (CTM) height on ultrasound
Methodological detailsblinded assessor
- Blinded assessor
Main finding
As reported in the abstract
CTM height
- Significant difference in cricothyroid membrane (CTM) height between the groups
- P<0.001
- Extended neck position: increase over neutral position
- 10%
- I-gel® plus neck extension: increase over neutral position
- 26%
- I-gel® plus neck extension: CTM long enough to accommodate a size 6.0 tracheal tube
- 100%
Observational data: associations, not effects.
Original publication
Both the extended neck position and insertion of a supraglottic airway device increases the height of the cricothyroid membrane in females. A prospective observational study. BJA Open. Published 20 December 2024. doi:10.
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