IT tube under LA
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I now have comprehensive information to give a thorough answer on ET tube under Local Anesthesia (Awake Intubation).
ET Tube Under Local Anesthesia (Awake Intubation)
"IT tube under LA" = Endotracheal (ET) tube insertion under Local Anesthesia = Awake Intubation. This is a core airway management strategy for the anticipated difficult airway.
Why Awake Intubation?
Awake intubation maintains spontaneous ventilation and airway reflexes in case the airway cannot be secured rapidly. Key advantages:
- Increased pharyngeal size and patency (muscle tone preserved)
- Relative forward positioning of tongue base, posterior positioning of larynx
- Maintained upper and lower esophageal sphincter tone → reduces aspiration risk
- Patient can cooperate (open mouth, protrude tongue, take deep breath)
- Active neurological assessment post-intubation is possible (e.g., unstable cervical spine)
- In emergencies, no absolute contraindications
Contraindications to elective awake intubation:
- Patient refusal (usually overcome with explanation)
- Inability to cooperate (children, severe dementia, intoxication, profound mental disability)
- Allergy to local anesthetics (true IgE-mediated allergy is extremely rare)
Patient Preparation
Psychological Preparation
Explain the procedure and rationale — most patients will cooperate once they understand why it's necessary.
Pharmacological Preparation
| Agent | Purpose | Notes |
|---|---|---|
| Glycopyrrolate 0.2 mg IV | Antisialagogue — dries secretions | Give 15 min before; improves topical LA efficacy |
| Oxymetazoline (nasal) | Vasoconstriction for nasal route | Applied to nares beforehand |
| Midazolam (small dose) | Anxiolysis | Avoid over-sedation |
| Fentanyl / alfentanil | Analgesia + antitussive | Titrate judiciously |
| Dexmedetomidine | Anxiolysis + sedation with minimal respiratory depression | Useful if LA allergy; α₂ agonist |
Avoid polypharmacy — use no more than two agents. Keep reversal agents available.
Local Anesthesia of the Airway
The upper airway is innervated by CN V, VII, IX, X — stretch receptors trigger coughing and gagging. Adequate topicalization is essential.
Step-by-step topicalization
- Anticholinergic first: Glycopyrrolate 0.2 mg IV ~15 min prior; dry the airway with suction.
- Tongue and oropharynx: Spray with 4% lidocaine or Cetacaine (14% benzocaine + 2% butamben + 2% tetracaine). Use a Mucosal Atomization Device (MAD) — less forceful than pressurized canisters, avoids triggering cough.
- Wait 2–3 minutes for numbness to set in.
- Epiglottis and vocal cords: Extend the MAD tip with a malleable extension to spray around the tongue base directly onto epiglottis and cords. Alternatively, use a laryngoscope for direct visualization + spray (more stimulating, less well-tolerated).
- Trachea: Percutaneous injection through the cricothyroid membrane — instill 4 mL 4% lidocaine; the patient's cough disperses it across tracheal and subglottic mucosa. Alternatively, inject through the working channel of the fiberoptic scope (Ovassapiian catheter technique) once the cords are visualized.
Intubation Technique
Flexible Fiberoptic (Scope-Aided) Intubation — Gold Standard for Awake
- Preload ET tube onto the flexible intubation scope (FIS)
- Advance FIS through oral or nasal route
- Visualize vocal ligaments → inject 4 mL 4% lidocaine through accessory lumen toward laryngeal/sublaryngeal structures
- Advance FIS through larynx into trachea → confirm carina
- Railroad ET tube over scope above carina → remove scope
- Confirm with capnography (end-tidal CO₂)
- Brief neurological exam if indicated (e.g., cervical spine cases) → then induce GA
Nasal vs Oral Route
| Nasal Route | Oral Route | |
|---|---|---|
| Preferred for | Dental/oral surgery, orthognathic surgery | General difficult airway |
| Tube type | Nasal RAE or straight tube + flexible connector | Standard ETT |
| Caution | Avoid in Le Fort II/III fractures (basilar skull fracture risk); prolonged pressure → nasal tissue necrosis | — |
Key Safety Points
- A dry airway is critical — glycopyrrolate removes future secretions, not existing ones; suction first.
- Over-sedation is dangerous — obstruction or apnea in a difficult airway can be catastrophic. Patients with OSA are especially prone to obstruction with minimal sedation.
- Confirm with capnography before inducing GA — do not rely on visualization alone.
- If oropharyngeal (throat) pack is placed intraoperatively, remove it before jaw wiring at end of surgery.
Sources:
- Barash, Cullen & Stoelting's Clinical Anesthesia, 9e — Awake Airway Management
- Morgan & Mikhail's Clinical Anesthesiology, 7e — Flexible Fiberoptic Intubation, Preoperative Considerations
- Roberts & Hedges' Clinical Procedures in Emergency Medicine — Awake Intubation
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