Needle cricothyroidotomy has been performed in a CICO scenario and transtracheal jet ventilation is started through the cannula. Adequate gas exchange fails to develop despite correct cannula position and adequate driving pressure. What is the most likely cause of this failure?

• A Driving pressure set below 1 bar
• B Use of pure oxygen instead of an oxygen-air mixture
• C Insertion of the cannula too far caudally, between the second and third tracheal rings
• D Complete obstruction of the upper airway preventing exhalation ✓

Explanation

Transtracheal jet ventilation delivers oxygen under pressure through a narrow cannula, but exhalation occurs passively through the natural upper airway. If the upper airway is completely obstructed, expired gas cannot escape, leading to rapid barotrauma, pneumothorax and circulatory arrest rather than effective ventilation. Upper airway patency must be established, for example with an oral airway and jaw thrust, before jet ventilation. Pure oxygen is appropriate, low driving pressures cause hypoventilation rather than barotrauma, and the cricothyroid membrane remains the recommended puncture site.

Reference: Benumof and Hagberg's Airway Management, 3rd ed.

High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP

Written and medically reviewed by the StethoPrep medical team.