Surgical Cricothyroidotomy

OVERVIEW

  • open procedure performed to secure the airway via an incision in the cricothyroid membrane
  • aka emergency surgical airway (ESA)
  • distinct from needle cricothyroidotomy (aka emergency cannula cricothyroidotomy), which is an alternative approach to ‘front of neck access’ (FONA)

INDICATIONS

  • can’t intubate, can’t ventilate (CICV) scenario

CONTRA-INDICATIONS

  • ability to secure an airway with less invasive means
  • airway trauma that renders access via the cricothyroid membrane futile
    • e.g. laryngeal fracture, tracheal transection
    • tracheostomy should be performed, or access achieved via the traumatic airway opening
  • Children < 10 years of age
    • young children are prone to laryngeal trauma and they have a higher incidence of postoperative complications)
    • perform needle cricothyrotomy is generally advised, however life-saving surgical cricothyroidotomy has been successfully performed in children

DESCRIPTION

  • Numerous techniques have been described, my preferred approach is the ‘knife-finger-bougie’ approach (Described below)
  • in an anticipated difficult airway requiring emergency intubation a ‘double set up’ approach should be used if possible
    • one person attempts intubation
    • another person prepares to perform the ESA
      • dons mask, visor, gown and gloves
      • marks the skin marked with surgical pen to identify cricothyroid membrane
      • locates cricothyroid membrane area and infiltrate skin and fascia with lignocaine with adrenaline (can be done while patient is awake if cooperative)
      • Has equipment opened and ready to procedure with the procedure when advised by the team leader
  • in a true emergency there may not be time for sterile preparation of the skin
  • consider sedation (e.g. IV ketamine 20 mg prn) – there may not be time in a true emergency and the patient will become obtunded as hypoxia supervenes
  • ESA is a tactile procedure and must be able to be performed without visual cues

Knife-finger-bougie approach

  • Equipment
    • scalpel blade (e.g. size 10)
    • artery forceps
    • bougie
    • size 6-0 ETT (or tracheostomy tube)
  • once decision made to proceed with ESA extend neck in supine position to make anatomy more accessible by palpation (aka the ‘laryngeal handshake’) +/- ultrasound (if time and available); note that airway has priority over suspected c-spine injury
  • stabilise the thyroid cartilage with the non-dominant hand
  • dominant hand holds scalpel and rests on the patients sternum for stability and support
  • 4 cm vertical incision through skin over cricothyroid membrane, may need to extend from mandible to sternum if impalpable anatomy (step may not be necessary if easily palpable anatomy – can go straight to the horizontal incision)
  • Once skin incised, palpate cricothyroid membrane position and blunt dissect with fingers (some prefer forceps) through subcutaneous tissue until the membrane is readily identifiable. Ignore bleeding until airway is secure (ETT placement usually has a tamponade effect)
  • Horizontal incision through membrane, drag scalpel blade from one side to the other then turn knife through 180 degrees and extend to the other side (some prefer to extend the membrane with forceps). The criciothyroid membrane is bound by a ‘cartilagenous cage’ so resistance will be felt at the margins of the membrane when the scalpel blade abuts cartilage.
  • Dilate with gloved little finger and palpate tracheal lumen, ideally identifying the cartilage of the posterior wall of the trachea/ cricoid ring
  • Pass bougie alongside little finger into trachea
  • Confirm bougie position with finger, ensuring it passes through membrane
  • Bougie usually holds up at carina <10cm from the skin (may feel tracheal rings as the bougie advances), do not force if hold up as may perforate carina
  • Pass ETT over bougie and intubate trachea. Ensure the ETT balloon is fully deflated and twist ETT as it passes the skin (hold up here is common). Only advance the ETT until the balloon is within the airway and no longer visible (if advanced further then endocbronchial intubation is likely).
  • Ensure ETT is held secure while bougie is removed and ETT is connected to BVM
  • Confirm ETT placement with ETCO2 (also adjunctive measures: auscultation, bilateral rise and fall of chest, fogging of tube and subsequent CXR)

Scott Weingart teaching the knife-finger-bougie approach at smaccGOLD 2015 (this is also the preferred approach taught on the Critically Ill Airway course):


Darren Braude’s video of the ‘knife-finger-bougie’ bougie-assisted cricothyroidotomy (note that the vertical incision is not shown as the anatomy is readily identifiable):

Andy Heard’s three step bougie-assisted cricothyroidotomy technique

  • This is similar to the ‘knife-finger-bougie’ technique described above, except the bougie is inserted alongside the vertically oritentated scalpel while it is in the airway, rather than the little finger
  • Make a midline longitudinal incision with No. 20 blade over cricothyroid membrane and use nondominant index finger to palpate membrane
  • Make a 5-mm transverse incision through membrane and insert a gum elastic bougie into trachea alongside the vertically orientated scalpel
  • Place cuffed 6.0-mm ET tube over bougie and slide into trachea; once in place remove bougie and secure ET tube

Andy Heard’s bougie-assisted cricothyroidotomy video:

Standard approach to surgical cricothyroidotomy using tracheal hook and Trousseau dilator

  • Make a longitudinal midline incision over the cricoid membrane
  • Identify the cricothyroid membrane via blunt dissection
  • Make a short transverse stab incision in the lower part of the membrane
  • Stabilize the larynx with a tracheal hook at the inferior aspect of the thyroid cartilage
  • Dilate the ostomy with curved hemostats
  • Place Trousseau dilator in the incision and further dilate the ostomy
  • Place tube in the trachea

Scott Weingart’s open cricothyroidotomy video:

Three step ‘knife-and-tube’ approach to surgical cricothyroidotomy (uses handle of scalpel to maintain access to airway when passing the endotracheal tube):

  • non-dominant hand secures trachea
  • Make a longitudinal midline incision over thyroid and cricoid cartilages followed by a transverse stab incision through cricothyroid membrane
  • Insert handle into cricothyroid membrane opening and rotate 90°
  • Insert 6.0-mm tube, inflate cuff and secure

Video by Siamek Moayedi (note this video also shows use of a tracheal hook to stabilise the trachea):

COMPLICATIONS

  • failure
  • bleeding
  • infection
  • damage to local structures — e.g. larynx, vessels, nerves, esophagus, cartilage, muscle
  • cricoid fracture
  • fistula formation
  • scarring
  • hypoxia
  • death

OTHER INFORMATION

Incision

  • An initial horizontal incision can be used if palpable anatomical landmarks allow easy identification of the cricothyroid membrane
  • In patients where the anatomy cannot be easily palpated (e.g. obesity, short neck, neck swelling), a long midline longitudinal incision should be made to facilitate accurate identification of the cricothyroid membrane
  • Landmark identification of the cricothyroid membrane is often unreliable, in a small study only 30% attempts by anaesthetists accurately marked the skin area over the cricothyroid membrane and only 10% marked over the centre point of the membrane (Elliot et al, 2010)

Surgical cricothyroidotomy versus cannula cricothyroidotomy

  • Langvad et al (2013) performed a systematic review that concluded, given the low quality of evidence and heterogeneity of studies that exist, no firm conclusions can be made about the relative success and complication rates of cannula cricothyroidotomy and surgical cricothyroidotomy
  • The NAP4 audit in the UK found a ~60% failure rate for emergency cannula cricothyroidotomy, whereas surgical cricothyroidotomy was almost universally successful
    • It is not clear if the cannula approach is intrinsically inferior, or whether other factors may have contributed to the low success rate
    • Nevertheless, this data supports the use of surgical cricothyroidotomy

Speed of surgical cricothyroidotomy

  • Most traditional surgical cricothyroidotomy procedures are faster than percutaneous techniques, with the average speed 83 ± 44s (range, 28–149s) (Paix and Griggs, 2011)
  • Hill et al (2010) found that a bougie-assisted technique is even faster than standard open cricothyroidotomy techniques in a sheep model (median time of 67s (interquartile range [IQR] = 55-82) versus 149s (IQR = 111-201) for the standard technique (p = 0.002)
  • The CricKey is a novel surgical cricothyroidotomy device combining the functions of a tracheal hook, stylet, dilator, and bougie incorporated with a Melker airway cannula. Mabry et al (2014) found that first-attempt success was 100% (15/15) for CricKey surgical cricothyroidotomy and 66% (10/15) for open surgical cricothyroidotomy (odds ratio 16.0; 95% CI 0.8 to 326). Surgical cricothyroidotomy insertion was faster for CricKey than open technique (34 versus 65s; median time difference 28s; 95% CI 16 to 48s).

Training

  • While clinical correlates are unknown, some recommendations are that providers of emergency airway management be trained on mannequins for at least five attempts or until their cricothyroidotomy time is 40 s or less (Wong et al, 2003)
  • Performance fade with the Melker Seldinger cricothyroidotomy set has been demonstrated after 3 months (Frerk and Frampton, 2006)

References and Links

Journal articles

  • Elliott DS, Baker PA, Scott MR, Birch CW, Thompson JM. Accuracy of surface landmark identification for cannula cricothyroidotomy. Anaesthesia. 2010 Sep;65(9):889-94. doi: 10.1111/j.1365-2044.2010.06425.x. Erratum in: Anaesthesia. 2010 Dec;65(12):1258. PMID: 20645953. [Free Full Text]
  • Frerk C, Frampton C. Cricothyroidotomy; time for change. Anaesthesia. 2006 Oct;61(10):921-3. PMID: 16978303.
  • Hessert MJ, Bennett BL. Optimizing emergent surgical cricothyrotomy for use in austere environments. Wilderness Environ Med. 2013 Mar;24(1):53-66. doi: 10.1016/j.wem.2012.07.003. Epub 2012 Oct 10. PMID: 23062323. [Free Full Text]
  • Hill C, Reardon R, Joing S, Falvey D, Miner J. Cricothyrotomy technique using gum elastic bougie is faster than standard technique: a study of emergency medicine residents and medical students in an animal lab. Acad Emerg Med. 2010 Jun;17(6):666-9. PMID: 20491685.
  • Langvad S, Hyldmo PK, Nakstad AR, Vist GE, Sandberg M. Emergency cricothyrotomy–a systematic review. Scand J Trauma Resusc Emerg Med. 2013;21:43. [article]
  • Mabry RL, Nichols MC, Shiner DC, Bolleter S, Frankfurt A. A comparison of two open surgical cricothyroidotomy techniques by military medics using a cadaver model. Ann Emerg Med. 2014 Jan;63(1):1-5. PMID: 24094476.
  • Paix BR, Griggs WM. Emergency surgical cricothyroidotomy: 24 successful cases leading to a simple ‘scalpel-finger-tube’ method. Emerg Med Australas. 2012 Feb;24(1):23-30. PMID: 22313556.
  • Patel SA, Meyer TK. Surgical Airway. Int J Crit Illn Inj Sci [serial online] 2014
  • Wong DT, Prabhu AJ, Coloma M, Imasogie N, Chung FF. What is the minimum training required for successful cricothyroidotomy?: a study in mannequins. Anesthesiology. 2003 Feb;98(2):349-53. PMID: 12552192.

FOAM and web resources


CCC 700 6

Critical Care

Compendium

Chris is an Intensivist and ECMO specialist at the Alfred ICU in Melbourne. He is also the Innovation Lead for the Australian Centre for Health Innovation at Alfred Health and Clinical Adjunct Associate Professor at Monash University. He is a co-founder of the Australia and New Zealand Clinician Educator Network (ANZCEN) and is the Lead for the ANZCEN Clinician Educator Incubator programme. He is on the Board of Directors for the Intensive Care Foundation and is a First Part Examiner for the College of Intensive Care Medicine. He is an internationally recognised Clinician Educator with a passion for helping clinicians learn and for improving the clinical performance of individuals and collectives.

After finishing his medical degree at the University of Auckland, he continued post-graduate training in New Zealand as well as Australia’s Northern Territory, Perth and Melbourne. He has completed fellowship training in both intensive care medicine and emergency medicine, as well as post-graduate training in biochemistry, clinical toxicology, clinical epidemiology, and health professional education.

He is actively involved in in using translational simulation to improve patient care and the design of processes and systems at Alfred Health. He coordinates the Alfred ICU’s education and simulation programmes and runs the unit’s education website, INTENSIVE.  He created the ‘Critically Ill Airway’ course and teaches on numerous courses around the world. He is one of the founders of the FOAM movement (Free Open-Access Medical education) and is co-creator of litfl.com, the RAGE podcast, the Resuscitology course, and the SMACC conference.

His one great achievement is being the father of two amazing children.

On Twitter, he is @precordialthump.

| INTENSIVE | RAGE | Resuscitology | SMACC

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