Unexpected Difficult Airway in a Patient with a Known Cervical Spine Injury
A 45-year-old male (BMI 32) with a recent C5-C6 fracture-dislocation, stabilized in a halo vest, is scheduled for posterior cervical fusion. He has a Mallampati 3 airway, limited mouth opening (2.5 cm), and a thick neck. He is anxious and refuses awake fiberoptic intubation. You plan general anesthesia with manual in-line stabilization. After induction with propofol and rocuronium, direct laryngoscopy reveals a Cormack-Lehane grade 3 view. Attempts at gum elastic bougie and video laryngoscopy (with a hyperangulated blade) are unsuccessful. Oxygen saturation is 92% and falling. You have a supraglottic airway (SGA) and a surgical airway kit available.
1. What is your immediate next step after the failed video laryngoscopy, and why?
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The immediate priority is to maintain oxygenation and prevent hypoxemia. With a failed video laryngoscopy and falling SpO2, I would insert a second-generation supraglottic airway (SGA) while maintaining manual in-line stabilization. The SGA can serve as a conduit for intubation or as a rescue device. I would choose a second-generation SGA because it has a higher seal pressure and allows for gastric decompression, reducing aspiration risk. If ventilation is successful, I would attempt intubation through the SGA using a flexible scope or a dedicated intubation catheter. If ventilation is inadequate, I would proceed to emergency front-of-neck access (FONA). The rationale is to follow the Difficult Airway Society (DAS) guidelines: after failed intubation, prioritize oxygenation via SGA, and if that fails, perform FONA. In a patient with a cervical spine injury, maintaining in-line stabilization is crucial to avoid neurological deterioration.
2. If the SGA fails to provide adequate ventilation, what is your next step and how do you perform it?
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If the SGA fails, I would immediately proceed to emergency front-of-neck access (FONA), specifically a scalpel-bougie-tube technique. I would continue manual in-line stabilization, but the priority shifts to securing the airway. I would perform a horizontal stab incision through the cricothyroid membrane (or trachea if cricothyroid is not accessible), insert a bougie, and then railroad a 6.0 cuffed endotracheal tube. This is in accordance with DAS guidelines for 'can't intubate, can't oxygenate' (CICO) situations. The rationale is that FONA is the last resort to prevent hypoxic brain injury and death. In a patient with a cervical spine injury, cricothyroidotomy is preferred over tracheostomy because it is quicker and less technically demanding. I would ensure the tube is secured and ventilation confirmed with capnography.