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Cricothyroidotomy
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Cricothyroidotomy

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Introduction

The cricothyroidotomy is emergency procedure that is performed to obtain an airway when you, as the care provider, cannot obtain another means of a definitive airway or if there are contraindications to orotracheal intubation

Indications and Contraindications

Indications

  • Can't ventilate and Can't oxygenate
  • Major facial trauma preventing passage of endotracheal tube (ETT) via orotracheal intubation
  • Airway obstruction preventing passage of ETT via orotracheal intubation

Contraindications

  • airway trauma that prevents passage of ETT through cricothyroid membrane
    • e.g. massive tracheal injury such as transection
  • Children < 10 years of age
    • patient's of this age are susceptable to laryngeal trauma
    • It is advise you perform needle cricothyrotomy in this patient population

Anatomy

You target is the cricothyroid membrane. This is where you will pass the endotracheal tube through. It is flanked by the thyroid cartilage superiorly and the cricoid cartilage inferiorly.

Anatomy of the Larynx

Anatomy of the Larynx

You should be away of some delicate structures flanking the larynx and cricothyroid membrane. This is mainly the carotid sheath which encases:

  • common carotid artery
  • vagus nerve
  • internal jugular vein
Anatomy of internal carotid sheath

Anatomy of internal carotid sheath

Note how the carotid sheath lies immediately lateral to the larynx. Any horizontal incisions in this area should be careful so you don't injury these structures. This is why in an emergency, large cuts are made vertically to first identify the cricothyroid membrane

Supplies

You will need a few thigns:

  • Your finger
  • A 5.0 endotracheal tube
  • a scalpel, (preferably a No. 10)
  • Gum Elastic Bougie

Option supplies:

  • cleaning solution - if this is a true emergency, there is not need to spend time cleaning or preparing the area for incision
  • forceps

The Procedure

Step 1 - Palpate

  • Feel for your landmarks. You can orient yourself by palpating the thyroid cartilage and laryngeal notch.
  • Just below this is your cricothyroid membrane, which will have a softer consistency compared to the cartilages flanking it.

Step 2 - Cut

  • With your scalpel, make a small midline incision approximately over the cricothyroid cartilage.
    • Verticle incisions can always be extended if needed.
    • After each incision, use your index finger to palpate the cricothyroid membrane
  • Once you've found the cricothyroid membrane, rotate your scalpel 90 degrees and make a small horizontal incision into the membrane.
    • be careful not to extend the cut too far, remember the carotid shealths lie lateral to the larynx.

Step 3 - Finger, Bougie, Endotracheal Tube

  • Once you've made the incision through the cricothyroid membrane, place your index finger into the incision you've made.
  • Exchange your finger in place with your gum elastic bougie, confirming you are in the trachea by sliding the bougie against the rigid tracheal rings.
    • You should feel the gum elastic bougie "clunk" against the tracheal rings - confirming you are in the airway/trachea.
  • Feed your endotracheal tube over the gum elastic bougie, only enough to fit the cuff of the endotracheal tube passed the incision into the airway
  • Inflate and secure the endotracheal tube.

About the Author

Medzcool
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