Difficult airway in a patient with a fixed cervical spine and a full stomach
A 38-year-old man with ankylosing spondylitis and a known fixed flexion deformity of the cervical spine presents for emergency laparotomy for perforated viscus. He has a Mallampati 3 view, mouth opening 3 cm, thyromental distance 5 cm, and cannot extend his neck. He is hemodynamically stable, Glasgow Coma Scale 15, and has a nasogastric tube draining bilious fluid. The consultant anesthetist is 20 minutes away.
1. How would you structure your airway plan, and what would you do differently if the consultant were not available?
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This is a predicted difficult airway with aspiration risk and a fixed cervical spine - a classic 'cannot intubate, cannot oxygenate' risk scenario.
Plan A (awake or after induction?):
- Given the full stomach and fixed neck, awake fiberoptic intubation (or videolaryngoscopy with a hyperangulated blade) is the safest approach if the patient will tolerate it. Topicalize the airway, keep the patient sitting up, and use a channeled scope.
- Preoxygenate for 3–5 minutes; have suction, a second operator, and a difficult-airway trolley ready.
Plan B: videolaryngoscopy with a hyperangulated blade and a bougie; avoid cricoid pressure if it worsens the view.
Plan C: supraglottic airway (second-generation, with a gastric channel) as a conduit for intubation or for rescue oxygenation.
Plan D: front-of-neck access - scalpel-bougie-tube cricothyroidotomy.
If the consultant is not available: do not proceed with a plan that depends on a skill you do not have. Call for the most experienced available anesthetist, consider delaying until the consultant arrives if the patient is stable enough, and if not, use the safest technique within your competence - awake fiberoptic or videolaryngoscopy - with a clearly stated rescue plan.
2. What does the nasogastric tube change about your aspiration risk assessment and induction technique?
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A draining NG tube reduces gastric volume but does not eliminate aspiration risk - it can still be present, and the tube itself can act as a channel for reflux. The patient still has a full stomach by history (perforation, ileus).
Implications:
- Aspirate the NG tube before induction and leave it on free drainage (or suction) during induction.
- Use a rapid sequence induction with preoxygenation, cricoid pressure (judiciously - it may worsen the view in a fixed neck), and a fast-acting neuromuscular blocker (suxamethonium or rocuronium 1.2 mg/kg with sugammadex available).
- Position head-up 20–30° if tolerated to reduce regurgitation.
- Have suction immediately available and a plan for immediate suction of the pharynx if regurgitation occurs.
- Consider awake intubation if you judge the airway too difficult for RSI - the two goals (aspiration vs. difficult airway) must be balanced explicitly and documented.
3. What monitoring and post-intubation steps would you insist on before the surgeon starts?
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- Capnography to confirm tracheal placement (waveform, not just color change).
- Bilateral breath sounds and chest rise; check for endobronchial intubation.
- Secure the tube - in a fixed-neck patient, tube displacement is a real risk; use a tube tie and note depth.
- Arterial line for continuous pressure and blood gas sampling.
- Temperature and urine output monitoring for a long laparotomy.
- NG tube confirmed on free drainage or suction, and stomach aspirated.
- Antibiotics and fluid resuscitation for perforation, and a plan for vasopressors if the patient becomes septic.
- Brief the team on the difficult-airway plan and where the front-of-neck kit is.