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Microlaryngoscopy Tube

Identical size 5.0 MLT shown above standard pediatric 5.0 ETT.

Microlaryngoscopy tube (MLT) vs. standard ETT

The MLT is often used in place of a standard small diameter ETT to facilitate Direct Laryngoscopic procedures utilizing Microlaryngoscopy techniques. The surgeon prefers a small diameter ETT to facilitate the view of the airway. The nickname for MLT is "mighty long tube"! Can you think of two advantages the MLT has over a standard pediatric ETT in an adult patient?


MLT vs. Pedi ETT

List two differences between the ETTs illustrated in the picture above that make the MLT more advantageous for ENT procedures in adults that necessitate a small diameter tube.

While both have a small diameter, the MLT:

  1. Is longer than standard ETTs of this diameter.
  2. Has a high volume, low pressure cuff

Both characteristics are a better match for the adult airway; pediatric tubes may be too short to properly position below the vocal cords and the cuff is too small to prevent leaks in the adult airway without overdistending and creating high cuff pressures that could injure tracheal mucosa.

Check your answer

Right Angle Endotracheal Tubes (RAE)

Right Angle Endotracheal (RAE) Tubes (Nasal on left; oral on right)

RAE- Right Angle ETT

  • Shaped for nasal and oral intubations
  • Useful for directing ETT & circuit away from surgical field
  • May make suctioning difficult
  • The nasal RAE is often used for oral surgery or mandibular Fx for ORIF.
  • The oral RAE is used in any surgery to facilitate directing the tubes away from the surgical field above the neck (ophthalmology, ENT or facial surgery) or for T&A with the mouth gag.

Laser Resistant Endotracheal Tubes

The most frequent laser related complication is airway fire. Laser Resistant ETTs are used to prevent airway fires during laser surgery of the airway. Initially, fires are located on surface of ETT and cause thermal injury to tissues. If the fire burns through to interior of ETT, O2 and positive pressure ventilation create a blow torch effect, blowing heat and toxic products down into lung. Cuff puncture allowing O2 enriched atmosphere can also increase chance of fire after laser burst.

Examples of laser resistant ETTs.

Insert possible link to powerpoint lecture with airway fire protocol.