Cannot intubate, cannot oxygenate

Why examiners ask this

This is the moment the whole airway algorithm exists for, and the examiner wants to hear that I recognize it early, name it out loud, and cut the neck without waiting for a number I will regret. It tests adaptability and organization above all: the candidate who keeps trying one more laryngoscope blade while the saturation falls through 70% fails on judgment, not on knowledge. It also lets the examiner probe the decisions that came before: why I induced this patient at all, and whether I had a plan that did not depend on the larynx.

The 60-second answer

Decision points and the "why"

• Declaring it early — the trigger is failed oxygenation, not a specific saturation; by the time the number reads 80% the real value is lower and falling fast. Naming the situation converts a crowd into a team with one task.
• Limited attempts at each rescue — optimized face mask with two-handed grip, oral airway and full relaxation; supraglottic airway at most three attempts, two with my preferred second-generation device and one with an alternative.¹ More attempts trade oxygen for hope. If a supraglottic airway oxygenates, I stop and think; this is no longer CICO.¹
• Full neuromuscular block before cutting — an unparalyzed, partially obstructed patient is the hardest airway; rocuronium or succinylcholine removes laryngospasm and chest wall rigidity from the differential. Ensuring full paralysis before critical hypoxia is the last chance to rescue the airway without cutting, so I give it if it is not already on board.¹
• Scalpel cricothyrotomy over needle — a wide-bore cuffed tube allows normal minute ventilation with a standard circuit, whereas high-pressure oxygenation through a narrow-bore cannula carries serious morbidity.¹ Needle cricothyrotomy with transtracheal jet ventilation is my choice only in a small child under about 10 years, where the membrane is too small for a blade, and I accept the barotrauma risk.
• Landmarks — I use the laryngeal handshake: stabilize the larynx with the non-dominant hand, find the cricothyroid membrane between thyroid and cricoid cartilages. In an impalpable neck I make an 8–10 cm vertical midline incision, dissect bluntly with fingers to the membrane, then proceed as above.¹
• Sugammadex is not a rescue — 16 mg/kg is the labeled dose for reversal soon after 1.2 mg/kg of rocuronium,² but a patient who was obstructing or apneic before induction gains nothing from a returning respiratory drive. I mention it so the examiner knows I have thought about it and rejected it.
• What I would have done differently — predicted difficulty with both intubation and mask ventilation is an awake technique; the strongest answer closes by saying so.

The complication they will inject

The cricothyrotomy fails or the tube goes into a false passage: the chest does not rise, there is no capnograph trace, and the neck is swelling. I recognize it from the absent end-tidal CO2 within two breaths and do not ventilate further through it, because every breath into the tissues makes the next attempt harder. I communicate that this is a failed front-of-neck access, move to an alternative invasive technique as the guideline expects,³ and the surgeon, if present, converts to an open tracheostomy while I continue attempting oxygenation from above with a supraglottic airway and two-handed mask. If I am alone I extend the incision vertically, re-identify the trachea by finger, and place the bougie under direct vision. If the patient arrests from hypoxia, I run ACLS with the airway as the reversible cause and continue the surgical airway during compressions.

Pitfalls that cost points

• Repeating laryngoscopy a third and fourth time because "the view was almost there."
• Quoting a saturation threshold as the trigger instead of failed oxygenation and the trend.
• Choosing needle cricothyrotomy in an adult and then being unable to explain how the patient exhales.
• Waiting for sugammadex as the plan rather than cutting.
• Forgetting to confirm with capnography and to plan the definitive airway, ICU care, and disclosure afterward.

Rapid-why

Q: Why the cricothyroid membrane and not the trachea? A: It is superficial, midline, relatively avascular, and bounded by cartilage; a tracheotomy through the isthmus of the thyroid bleeds and takes minutes I do not have.

Q: Why does a supraglottic airway so often rescue a failed mask? A: It bypasses the tongue and soft palate, which are the usual sites of obstruction, and seals below them; it fails when the obstruction is at or below the glottis.

Q: How does the patient exhale after needle cricothyrotomy? A: Only through the native upper airway; if that is completely obstructed, each jet insufflation stacks and causes barotrauma within minutes, which is why I convert to a surgical airway.

Q: When do I wake the patient instead of cutting? A: Only if I can oxygenate; waking is an option after failed intubation with successful ventilation, never in CICO.

Numbers to know

Links

• Anticipated difficult airway and the ASA algorithm, Awake fiberoptic intubation: topicalization and sedation, laryngospasm, Tracheostomy, laser surgery and jet ventilation (coming), sugammadex, Hypoxic gas mixture and oxygen supply failure (coming)
• Atlas: Capnography: waveforms and sudden loss of ETCO2; Monitor atlas: perioperative respiratory events
• ASA Practice Guidelines for Management of the Difficult Airway (2022); Difficult Airway Society guidelines for unanticipated difficult intubation in adults