#JanuAIRWAY Day 3. The Difficult Airway. Many definitions. NAP4 has a procedural framework. Useful but not the whole picture. @HansHuitnik and Bouwan’s seminal pubmed.ncbi.nlm.nih.gov/25511477/ introduces ‘complexity factors 1/7
Complexity factors make easy things difficult e.g. operator experience, location, time pressure. Must be considered. @Huitink also suggest ditching the term ‘difficult’ in favour of ‘basic & advanced’ Here’s a #OnePager covering the basics
#JanuAIRWAY #FOAMed 2/7
Our airway assessment aims to determine difficulty of management. We want to use our holistic assessment (Hx, Ex and Ix) answer several questions.

Here’s a #OnePager outlining some of the key information we need

#FOAMed #JanuAIRWAY 3/7
After complexity factors, we need situational awareness. Imagine ‘thinking zones’ emanating from the patient.
Patient (anatomy, physiology)
Airway manager (experience, fatigue, stress)
Team (experience, number)
Environment (time, familiarity, safety)

#JanuAIRWAY 4/7
When we want to integrate our assessment info and situational awareness, the cynefin framework (by @snowded) and the Johari window can help our mental model for decision-making in ‘difficult airways’.

We’ll talk more about decision-making later this month! #JanuAIRWAY 5/7
Here are some papers / links that you might find interesting: -
a.nationalauditprojects.org.uk/NAP4_home
b.pubmed.ncbi.nlm.nih.gov/25511370/
c.pubmed.ncbi.nlm.nih.gov/25511477/
If you have any others of interest, tweet them to us for inclusion next time!

#JanuAIRWAY 6/
Hope that helps. Tomorrow we'll look at investigations /ultrasound and how we can use them to assess airways. See you then! #JanuAIRWAY 7/7

*Disclaimer: Inclusion of content (equipment, techniques and scoring systems etc.) in #JanuAIRWAY does not constitute DAS endorsement

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More from @dastrainees

4 Jan
#JanuAIRWAY Day 4. Airway Investigations. 2 broad categories we can use to round out our airway assessment; flow/volume-based lung function tests & imaging techniques. They vary in their usage and usefulness. Here's some #OnePagers #FOAMed on Spirometry and Flow-volume loops 1/17 ImageImage
Spirometry (literally ‘measuring breath’) and flow-volume loops give us information on the mechanics of ventilation. They can be helpful in a more global assessment of respiratory function, but are less helpful in acute airway management.

#JanuAIRWAY #FOAMed 2/17 ImageImage
Diffusing Capacity / Transfer factor can augment lung function tests and give us info about alveolar diffusion and alveolar thickness. Again, helpful in global assessment, but less helpful acutely. Here’s another #OnePager covering the theory and the practice

#JanuAIRWAY 3/17 Image
Read 17 tweets
2 Jan
#JanuAIRWAY Day 2. Bedside Airway Assessment. NAP4 @doctimcook showed poor airway assessment contributes to poor outcomes. Thorough assessment = essential. Here’s a #OnePager on bedside tests to help assess for potential difficult airway management. #FOAMed #JanuAIRWAY 1/8
Airway Assessment should be holistic & comprised of three basic parts: -
1) History - including review of previous management (if possible),
2) Examination - visual examination and bedside tests &
3) Investigations (we'll look at these more later this month).
#JanuAIRWAY 2/8
NAP4 gives us a structure to focus our examination on anatomical/procedural difficulty: -
1) Difficult bag mask vent.
2) Difficult SAD insertion
3) Difficult laryngoscopy
4) Difficult intubation
5) Difficult Front of Neck Airway (FONA)
6) Difficult extubation
#JanuAIRWAY 3/8
Read 8 tweets
1 Jan
Happy New Year Everyone. Welcome to #JanuAirway. Let’s start with the basics – Oxygen. Meaningful delivery of adequate oxygen is the fundamental aim of airway management. Think A.B.O. – Always, Be, Oxygenating. Here’s a #OnePager covering the basics of oxygen physiology 1/7
Knowledge of the three basic equations for oxygen physiology is essential: -

Arterial Oxygen Content

Oxygen Delivery

Oxygen Consumption

They can steer us towards various physiological parameters that we can manipulate to treat hypoxia / hypoxaemia. 2/7

#JanuAIRWAY
Oxygen cascade shows levels and processes involved and differentials for hypoxia/hypoxaemia: -

Oxygenation (e.g. low O2)
Diffusion (e.g. pulm fib)
Ventilation (bullae)
Perfusion (low cardiac output)
Oxygen carriage (anaemia)
Oxygen demand / use (sepsis) 3/7
#JanuAIRWAY
Read 7 tweets

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