Anatomical Landmarks For Intubation

Few EMS procedures are as important as tracheal intubation. This procedure can also be challenging, and not just for novice providers. If skills are not initially mastered and frequently practiced, intubation success rates plummet and placement of an advanced airway doesn’t occur.

Remember that proficient manual ventilation is generally better than compromised ventilation using an endotracheal tube. Your skills, technique, and equipment use are key to ensuring your intubation attempts are successful.

An important aspect of successful tracheal intubation is visualization of various anatomical landmarks during the procedure itself. Using these landmarks along with practiced skill and the best equipment will increase your success in tracheal intubation.

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Visualize the Epiglottis

The tip of the epiglottis is perhaps the most important landmark to visualize during oral intubation and can be viewed using slow and methodical advancement of the blade. Once the edge of the epiglottis is in sight, gently advance the tip of the blade into the vallecular fossa. With the blade properly positioned, the epiglottis can then be lifted away from the pharynx.

 

Visualize the Larynx

After using the blade to lift the epiglottis, you should be able to visualize the larynx and pass the endotracheal tube through the cords. If you are unable to visualize the larynx, there are some tips you can use to help achieve this.

  • Consider your patient’s positioning—Although the neutral “sniffing” position may still be taught as the gold standard for intubation, consider alternative positioning if your patient can tolerate it. A “ramped” positioning may be especially helpful in obese patients who may have difficulty flexing their necks. This position involves raising the patient’s shoulders and upper torso and aligning the ear to the chest, usually using pillows or blankets.
  • Make sure your patient’s airway is clear—What good is proper positioning of both your patient and your blade if airway contaminants block your view of the patient’s anatomy? Not only can you not see the landmarks for intubation, but your patient will be at risk for developing aspiration pneumonia. Consider using a hyper-flexed suction tip catheter and constant suctioning using a technique such as Suction Assisted Laryngoscopy and Airway Decontamination (SALAD), developed by Dr. James DuCanto. For more on this technique, see Dr. DuCanto explain it in detail here.  

 

Estimate Tracheal Tube Insertion Depth

The standard depth of insertion for an endotracheal tube is 21-23 cm at the upper incisors for an adult. Many EMS providers use this exclusively when determining the correct depth of insertion during intubation.

 

Another method of estimating correct insertion depth is using anatomical landmarks during intubation. This may be achieved by taking two measurements and adding them together. The first number is the distance measured (in cm) from the right mouth corner to the right mandibular angle. The second number is the distance from the right mandibular angle to a point situated on the center of a line through the middle of the sternum. Add these two measurements together to determine the depth (in cm) for the endotracheal tube. This method may not be as quick as falling back on the 21/23 cm standard insertion depth, but it does use the patient’s own anatomical landmarks for ease of assessing proper depth.

 

Anatomical Landmarks for Intubation

Visualizing and using your patient’s own anatomical landmarks during intubation may help you in your next attempt at securing an advanced airway. Visualize both the epiglottis and larynx, but also know various positioning techniques that you can use to improve your visualization of these landmarks.

Clear your patient’s airway of contaminants such as blood, vomit, or other material in order to decrease the risk of aspiration during intubation and to increase your visualization of the patient’s airway anatomy. Using these landmarks and techniques will give you a better chance of successful intubation and will provide your patients with the best outcomes.

 

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