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Anaesthesiology
Face masks and oxygen delivery devices
Built from Al-Shaikh — Essentials of Equipment in Anaesthesia, Critical Care and Peri-operative Medicine, 6e
What’s inside
4 sections · 59 slides
Overview
- What this session covers
- First principles: what 'FiO2' means
Face Masks and Angle Pieces
The interface between patient and breathing system
- The anaesthetic face mask
- Transparent masks with air-filled cuffs
- Anatomy and function
- Why dead space matters here
- Face masks: problems and safety
- Paediatric face mask designs
- Nasal masks (inhalers)
- Goldman nasal inhaler
- The catheter mount
- Catheter mount
- Catheter mount: function and risks
Oxygen Delivery Devices
Variable versus fixed performance
- The core idea: variable vs fixed performance
- Classifying oxygen delivery systems
- Variable performance masks (medium concentration)
- Adult and paediatric variable performance masks
- What raises or lowers delivered FiO2
- How the variable performance mask works
- Rebreathing and CO2 in the MC mask
- Reservoir masks: partial rebreather and nonrebreather
- Variable performance mask with reservoir bag
- Useful variants
- Mask with exhaled CO2 monitoring port
- Variable performance tracheostomy mask
- Variable performance masks: safety and summary
- Nasal cannulae
- Oxygen nasal cannula
- Nasal cannulae: mechanism and advantages
- Nasal cannula with exhaled CO2 sampling
- Nasal catheters
- Oxygen nasal catheter
- Open oxygen delivery systems
- Open oxygen supply system
Fixed Performance Devices
Constant FiO2 independent of the breathing pattern
- The Venturi mask (HAFOE)
- The Bernoulli principle at work
- Mechanism of the Venturi mask
- UK Venturi device colour coding
- Colour-coded Venturi devices
- Energy, entrainment and no rebreathing
- Detail of high and low FiO2 Venturi devices
- Venturi mask in practice
- Adult, paediatric and breathing-system Venturi
- Adjustable Venturi valve
- Venturi mask: cautions and summary
- Humidified high-flow nasal oxygenation
- Humidified high-flow nasal oxygenation
- HFNO: build and physiology
- HFNO: cautions and summary
- Key-points summary marker
- Why is the Venturi mask a 'fixed performance' device while a Hudson mask is not?
- Numbers worth remembering
- Three things to carry away
- References
- Essentials of Equipment in Anaesthesia, Critical Care, and Perioperative Medicine