6.2 Pre-Intubation Optimization
Key Takeaways
- Resuscitate before you intubate: raise mean arterial pressure with blood, a vasopressor, or appropriate fluid before induction, or peri-intubation arrest becomes the next call.
- Denitrogenate with 100 percent oxygen and leave a flush-rate nasal cannula running for apneic oxygenation; ramp the adult to ear-to-sternal-notch.
- Delayed sequence intubation uses dissociative ketamine so an agitated hypoxic patient will accept a mask—it is a preoxygenation strategy, not a full RSI drug list.
- Verbalize the failed-airway plan, open the cricothyrotomy kit, stage two suctions and a bougie, and have video and direct laryngoscopy both ready.
- If the airway can wait ninety seconds, do the work on the ground: noise, light, helmets, and a 24-inch cabin make the aircraft a terrible laryngoscopy suite.
Pre-intubation optimization is how a flight nurse prevents peri-intubation cardiac arrest. The August 2026 Certified Flight Registered Nurse (CFRN) outline lists it as its own skill, separate from the tube itself. Resuscitate before you intubate means you restore oxygen reserve and blood pressure before you take away airway tone. If the airway can wait ninety seconds, do that work on the ground. The cabin is noisy, poorly lit, and access-limited; it is a terrible laryngoscopy suite.
Resuscitate and denitrogenate
Raise mean arterial pressure first
Induction and positive-pressure ventilation drop mean arterial pressure (MAP) by removing sympathetic drive and by raising intrathoracic pressure, which cuts venous return. A scene patient already at a MAP of 55 mm Hg will arrest when that happens.
- Give blood for hemorrhage, not a third liter of crystalloid.
- Use a vasopressor infusion or a push-dose pressor to lift MAP before induction when the tank is not empty.
- For tamponade, right-ventricular (RV) failure, and massive pulmonary embolism, protect preload and avoid high tidal volumes.
A working number many critical-care programs teach is to raise MAP toward 80 mm Hg when that is realistic. The exact target is program-specific; Board of Certification for Emergency Nursing (BCEN) does not publish a cutoff. The exam idea is rise the pressure first.
| High-risk physiology | Why induction arrests them | Optimize first |
|---|---|---|
| Hemorrhagic shock | Empty tank plus vasodilation | Blood, pelvic binder, limited crystalloid, pressor bridge |
| Metabolic acidosis with compensatory tachypnea | You steal the minute ventilation that was keeping pH livable | Delay apnea; consider delayed sequence; ventilate through the attempt |
| RV failure / massive pulmonary embolism | High intrathoracic pressure collapses the RV | Gentle volumes, avoid hypoxia and hypercarbia, support blood pressure |
| Cardiac tamponade | Positive pressure slashes venous return | Fluids to fill the constraint; drain if you can; delay the tube |
| Status asthmaticus | Breath-stacking and auto-PEEP | Maximal medical therapy, long expiratory time, be ready for hypotension |
Those four arrest traps—metabolic acidosis, RV failure, tamponade, and asthma—are the stems in which a pretty tube still produces a pulseless patient.
One hundred percent oxygen and a nasal cannula
Denitrogenate with a tight nonrebreather or a well-sealed mask on 100 percent oxygen for several minutes when time allows. Leave a nasal cannula (NC) running at flush rate—commonly 15 liters per minute—through the entire attempt. That is apneic oxygenation: a passive stream into the pharynx while you look. It is not a substitute for preoxygenation. If the patient will accept a mask, let them breathe 100 percent. If they will not, that is the opening for delayed sequence, not for wrestling.
Position, delayed sequence, gear, and the ramp
Ear-to-sternal-notch
Ear-to-sternal-notch positioning aligns the external auditory meatus with the sternal notch. In an adult that means ramping the head and torso, not a lonely pillow under the occiput. Obesity and late pregnancy need a real ramp so the pannus or gravid uterus is off the diaphragm. In a young child the large occiput already flexes the neck; a towel under the shoulders is the pediatric equivalent. On a scene backboard, do the best ramp you can. Position is free; a second look in a 24-inch cabin is not.
Delayed sequence is not a full RSI
Delayed sequence intubation (DSI) is a preoxygenation strategy. An agitated, hypoxic patient who rips off the mask cannot denitrogenate. A dissociative dose of ketamine lets that patient tolerate a mask so the saturation actually rises. After the reservoir is full, you proceed to a planned airway. DSI is not the full rapid sequence intubation (RSI) drug table—that lives in Chapter 7. On the CFRN, recognize the indication: the combative hypoxic patient who will not accept oxygen.
Failed-airway gear, then do it on the ground
Say the failed-airway plan out loud so the partner, the medic, and the pilot hear the next move. Then touch the gear.
- Two working suctions. One will clog with blood or vomit.
- A bougie out of the package, not in the bottom of the airway roll.
- Video laryngoscopy (VL) and direct laryngoscopy (DL) both ready; blood can wipe a camera.
- An SGA (i-gel, laryngeal mask airway (LMA), or King) within reach.
- A cricothyrotomy kit open. Feel the membrane before induction.
The plan is usually: best look, then SGA and oxygenate, then front of neck if you still cannot move air.
Rotor wash, helmets, night-vision goggles (NVG), seat rails, and a low cabin ceiling steal every axis you need. You cannot hear breath sounds. If the patient is still on the ramp and the airway is not crashing in the next seconds, optimize and secure it before you load. In-flight intubation is a rescue when the airway closes after lift, not a way to save scene time. A hangar floor beats a narrow fuselage at 8,000 feet of cabin altitude.
- Raise MAP with blood or a pressor before induction.
- Preoxygenate with 100 percent oxygen and leave a flush-rate NC running.
- Ramp to ear-to-sternal-notch.
- Use ketamine DSI when agitation is blocking preoxygenation.
- Verbalize the failed-airway plan and open the cric kit.
- Prefer the ground to the cabin.
A hypotensive scene patient needs a definitive airway. The aircraft is spinning two minutes out. Which plan best reflects pre-intubation optimization?
An agitated, hypoxic trauma patient rips off every oxygen mask on the ramp. What is the delayed-sequence concept?
Which patient is at highest risk of peri-intubation arrest if you induce before optimizing blood pressure and minute ventilation?