Today, the emergency cricothyroidotomy is the surgical rescue technique of choice for the failed airway in adults. It is considered a more straightforward procedure than the tracheostomy. This activity describes the indications, contraindications, and technique involved in performing a cricothyroidotomy and highlights the role of the interprofessional team in ensuring airway access in difficult patients.
Summarize the anatomical structures involved in a cricothyroidotomy.
Review the indications for a cricothyroidotomy.
Identify the potential complications of associated with cricothyroidotomy.
Explain interprofessional team strategies for enhancing care coordination and communication to advance the management of patients with difficult airways and and improve patient outcomes.
The surgical airway is not a new concept in the world of medicine. Ancient Egyptian hieroglyphics display images indicating that surgeons may have performed this procedure thousands of years ago. In 100 B.C., Asclepiades of Bithynia completed the first documented, elective surgical airway. In 1546, Antonio Mus Brassavola was the first to record a successful surgical airway, and Thomas Fienus first coined the term “tracheotomy” in 1649.
Despite 5,000 years of history, the surgical airway was not a formal surgical technique until 1909, when Dr. Chevalier Jackson, a laryngologist at Jefferson Medical School in Philadelphia, detailed a procedure he called the “high tracheostomy.” The high tracheostomy was utilized for inflammatory processes such as diphtheria. However, Dr. Jackson later condemned his own procedure, having reviewed nearly 200 cases of tracheal stenosis secondary to cricothyrotomy and the cricothyrotomy fell out of favor.
It wasn’t until the 1970s that the cricothyrotomy returned to mainstream practice when physicians Brantigan and Grow published a low complication rate on a series of 655 patients undergoing elective cricothyrotomy. In this review, they showed a low complication rate in 655 patients undergoing elective cricothyrotomy for prolonged mechanical ventilation, with only 0.01% of patients developing subglottic stenosis. Today, the emergency cricothyrotomy is now the surgical rescue technique of choice for the failed airway in adults. It is considered a more straightforward procedure than the tracheostomy. Brantigan and Grow ultimately concluded that the cricothyroidotomy is a benign, well-tolerated procedure.
Over the last 100 years, several techniques have been described to obtain airway control via the cricothyroid membrane. There are essentially three separate techniques that ultimately arrive at a controlled airway and are in use today.
Small caliber cannula (i.e., IV angiocath) can be inserted through the cricothyroid membrane percutaneously. High-pressure oxygen can then be insufflated into the trachea in a technique referred to a “jet ventilation.” This technique requires an unobstructed upper airway for passive expiration and therefore does not prevent hypercapnia. This technique is not suitable for long-term ventilation.
Large caliber cannulas developed by a multitude of medical companies can be inserted percutaneously through the cricothyroid membrane, often using the Seldinger technique over a guide wire. These cannulas are typically at least 4 mm in internal diameter, allowing for low-pressure ventilation.
Open surgical cricothyrotomy is the final pathway to the emergent airway. Over the last century, multiple techniques have been described, often complex and time-consuming, utilizing any number of specialized tools. However, given the time-sensitive nature of the emergent cricothyrotomy, the technique should be simple and rapid. The rapid “Scalpel-Finger-Bougie” technique is the preferred technique taught by airway experts across the field of emergency medicine.
For the rest of this article, when speaking of emergent cricothyroidotomy in the “cannot intubate, cannot oxygenate” (CICO) situation, we will discuss the scalpel-finger-bougie technique.
Anatomy and Physiology
Cricothyrotomy is performed by inserting a tube through an incision in the cricothyroid membrane. To perform a cricothyrotomy under emergent circumstances, it is necessary that physicians have some knowledge about the relevant anatomy. The cricothyroid membrane (CTM) is bordered superiorly by the thyroid cartilage, inferiorly by the cricoid cartilage, and laterally by the bilateral cricothyroideus muscles. Begin by palpating the laryngeal prominence, colloquially known as the “Adam’s Apple,” on the thyroid cartilage. Within the thyroid cartilage are the vocal cords. Inferiorly, palpate the round “signet ring” of the cricoid cartilage. Approximately 2 cm inferior to the laryngeal prominence and superior to the cricoid cartilage lies the CTM, which is identified by palpating a slight depression between the two cartilaginous structures.
The emergency cricothyrotomy is the final step in the emergency airway management algorithm, becoming necessary when you find yourself in a CICO scenario. (Cannot Intubate, Cannot Oxygenate is also sometimes referred to as “Cannot Intubate, Cannot Ventilate"). Failure to recognize and intervene in a CICO scenario can rapidly lead to brain hypoxia and patient death. A percutaneous airway must be established immediately in a CICO scenario.
The emergency cricothyrotomy is indicated in any CICO scenario. Some situations in which a physician may encounter CICO include :
Oral or maxillofacial trauma
Cervical spine trauma
Profuse oral hemorrhage
Anatomic abnormalities that prevent endotracheal intubation
In the CICO situation, there are no absolute contraindications to emergent cricothyrotomy.
Relative contraindications include possible or known tracheal surgery, fractured larynx, laryngotracheal disruption, and children. Patients with an acute laryngeal disease may have a higher rate of subglottic stenosis, making elective cricothyrotomy relatively contraindicated. Cricothyrotomy is a relative contraindication in children less than 5-12 years because of the funnel shape of the pediatric airway and a theoretically increased risk of subglottic stenosis.
Scalpel (preferably #20 blade)
Gum elastic bougie
Cuffed tracheostomy tube 6.0
10 cc syringe
Ventilator and tubing
Often the most significant barriers to a surgical airway are cognitive. The emergent cricothyrotomy is no more complicated than placing a chest tube or other, routine emergency procedure. However, the terms "failed airway" and "cannot intubate, cannot oxygenate" may be correlated with personal failure in the physician's mind, leading to an inappropriate delay in the decision to cut the neck. Regular practice on simulators or cadavers is necessary to become familiar with the technique will help to reduce the anxiety associated with the procedure when it becomes clinically necessary. Before any intubation, especially a potential "difficult airway," a physician should go through a difficult airway algorithm, reducing both the anxiety and difficulty of the final step in that pathway, the emergent cricothyrotomy. The airway plan, from intubation medications to the stops following a failed intubation attempt should be verbalized out loud to members of the healthcare team. The physician should identify critical neck anatomy and landmarks in case a cricothyrotomy becomes necessary. Finally, all equipment should be readily available at the bedside.
The literature describes several techniques, including many tools, dilators, or specialized cannulas to obtain tracheal access. It is the author's belief, and the belief of many within the Emergency Medicine/Critical Care community, that the bougie-aided cricothyroidotomy, also known as the "Three-Step Method" combines the most important steps in both the Seldinger technique and the "rapid four-step" surgical approach, providing a simple technique to maximize success in this rarely performed, high-stress situation.
Using your non-dominant hand, identify the cricothyroid membrane with your index finger while stabilizing the larynx between the thumb and middle finger.
Make a 4 cm vertical incision through the skin overlying the cricothyroid membrane.
Bluntly dissect with fingers through the subcutaneous tissue until the cricothyroid membrane is identifiable. **Ignore bleeding
Using the scalpel, puncture the cricothyroid membrane, slicing horizontally.
Insert your finger through the incision.
Slide a gum elastic bougie through the incision, using your finger to guide it inferiorly, into the trachea.
Pass a 6.0 cuffed endotracheal tube over the bougie, until the balloon is no longer visible and inflate the cuff.
Using a BVM, confirm placement with end-tidal capnography.
Secure the ET tube in place with a securement device.
Immobilize the larynx and identify the cricothyroid membrane by palpation with the index finger of your nondominant hand. This is achieved by identifying the inferior border of the thyroid cartilage and the superior border of the cricoid cartilage in the midline of the neck.
While continuing to hold the larynx stable, create a vertical incision in the skin overlying the CTM in the midline of the neck, extending the incision approximately 3-5 cm in length.
After creating your vertical skin incision, palpate the CTM and create a horizontal incision through the membrane. Be sure to direct your scalpel caudally to avoid the vocal cords and create the incision carefully, avoiding the posterior wall of the trachea.
Keep the tip of your index finger in the incision through the CTM while you insert a tracheal hook into the hole, under the thyroid cartilage. Put upwards traction on the thyroid cartilage.
Insert a trousseau dilator to extend the horizontal incision vertically.
Insert the tracheostomy tube through the trousseau dilator and advance it caudally into the trachea.
Remove the trousseau dilator and tracheal hook.
Remove the obturator of the tracheostomy tube.
Insert the inner cannula of the tracheostomy tube.
Stabilize the larynx and create tension overlying the cricothyroid membrane (CTM) by using the thumb and middle finger of your nondominant hand to stretch the skin in a vertical direction, palpating the CTM with the index finger.
With your dominant hand, use a 3-10 mL syringe filled with 50% saline attached to an angiocatheter, puncture the skin overlying the CTM at the inferior margin of the CTM. Direct your needle caudally at a 30-45 degree angle. While advancing, apply continuous negative pressure on the syringe. When air bubbles are visualized within the syringe, you have confirmed placement within the trachea. Stop advancing the needle.
Advance the catheter until the hub abuts the skin. Remove the needle.
Attach the saline syringe to the catheter and again confirm intratracheal placement by aspirating air.
Hold the catheter in place at all times. Do not rely on a suture to maintain correct positioning.
Connect the catheter to high-pressure tubing or a BVM with 100% oxygen. Ventilation should be at a rate of 10-12 breaths per minute, using an I: E ratio of approximately 1:4.
The emergency cricothyrotomy is the last step in the CICO algorithm and is a step taken to save the life of a patient. Therefore, it is a procedure in which the benefit drastically outweighs the risk. However, the procedure is not without complications. Complication rates differ from study to study, based on the clinical scenario, level of training, or location of procedure, ranging from 0% to as high as 54%. The most common complication is bleeding. Bleeding is expected and should be ignored during the procedure. If severe bleeding occurs, pressure or packing at the site should provide control. Other immediate complications include lacerations of tracheal cartilage, including the thyroid, cricoid, or tracheal rings, perforation of the trachea, creation of a false tract (passage of the ET tube into a potential space other than the trachea), and infection. Long-term complications include subglottic stenosis and voice changes.
The cricothyrotomy is the final step in the difficult airway algorithm when a provider encounters a CICO scenario.
Being prepared to perform what is a manually simple but cognitively difficult procedure can be the difference between life and death for a patient that requires an emergent airway.
Enhancing Healthcare Team Outcomes
The emergent cricothyroidotomy is not a difficult procedure from a technical standpoint. However, from a cognitive standpoint, it may be prohibitive to the unprepared team. To perform this procedure successfully, it must involve an interprofessional team that includes physicians, nurses, and respiratory therapists. Before attempting intubation in a presumed difficult airway, the physician should announce to everyone involved in patient care that there is a potential need for emergent cricothyroidotomy. Often, this may involve marking of landmarks on the patient's neck. By announcing the potential for cricothyroidotomy, it eliminates the cognitive barriers before the procedure even becomes required.
The American College of Surgeons recommends the emergent cricothyroidotomy as the airway of choice in the can't intubate, can't ventilate situation. As per the Advanced Trauma Life Support guidelines, the "...surgical cricothyroidotomy is preferable to a tracheostomy for most patients who require the establishment of an emergency surgical airway, because it is easier to perform, associated with less bleeding, and requires less time to perform than an emergency tracheostomy."
Quick JA,MacIntyre AD,Barnes SL, Emergent surgical airway: comparison of the three-step method and conventional cricothyroidotomy utilizing high-fidelity simulation. The Journal of emergency medicine. 2014 Feb [PubMed PMID: 24188608]
Patel RG, Percutaneous transtracheal jet ventilation: a safe, quick, and temporary way to provide oxygenation and ventilation when conventional methods are unsuccessful. Chest. 1999 Dec [PubMed PMID: 10593796]