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
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Background: Emergency Front of Neck access (eFONA) via cricothyroidotomy using a size 6 internal diameter tracheal tube is recommended by the Difficult Airway Society in the event of a 'can't intubate, can't oxygenate' (CICO)... ...
