#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
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)
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
#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
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.
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 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
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