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The first 25 slides, exactly as they appear. The full deck has 58 content slides.
Anaesthesiology
Humidification and filtration
Built from Al-Shaikh — Essentials of Equipment in Anaesthesia, Critical Care and Peri-operative Medicine, 6e
What’s inside
9 sections · 58 slides
Overview
- What this deck will teach you
Why the airway needs help
What dry gas does, and the heat and water cost of conditioning it
- What breathing dry gas does to you
- The hidden heat and water cost
- The numbers that frame the problem
Measuring humidity
Absolute vs relative humidity, and the isothermic boundary
- Two ways to measure water in gas
- How the nose conditions air
- What the ideal humidifier would do
The heat and moisture exchanger
The compact passive 'artificial nose'
- How a heat and moisture exchanger works
- The HME: an 'artificial nose'
- Combined HME and breathing filter
- What is inside an HME
- The mechanism, step by step
- Tracheostomy heat and moisture exchanger
- What changes an HME's performance
- HME problems and safety rules
Active humidifiers
Adding water with power: bubble and hot-water-bath devices
- Bubble humidifier for oxygen delivery
- The bubble humidifier
- The hot-water-bath humidifier: the idea
- Hot-water-bath humidifier unit
- Hot-water humidifier in the breathing system
- What the hot-water-bath humidifier is made of
- Mechanism of the hot-water-bath humidifier
- How the hot-water-bath humidifier works
- Hot-water-bath humidifier: dangers and safeguards
Nebulizers
Humidifying with a mist of water microdroplets
- What a nebulizer does
- Gas-driven (jet) nebulizer
- The gas-driven (jet) nebulizer: parts
- How the jet nebulizer makes droplets
- How the jet nebulizer works
- Two other nebulizer designs
Bacterial and viral filters
Stopping microbes crossing between patients and machine
- Why breathing filters are used
- A breathing-system bacterial/viral filter
- How small are the targets?
- What the ideal filter would do
- The five ways a fibre catches a particle (1 of 2)
- The five ways a fibre catches a particle (2 of 2)
- Electrostatic filter medium
- Electrostatic filters
- Pleated hydrophobic filter medium
- Pleated hydrophobic filters
- Filters at a glance
Vapour-clean filters
Scrubbing volatile agent from a machine
- Activated-charcoal agent-scrubbing filters
- Vapour-clean filters
Wrap-up
Key points, a viva and the sources
- The three ideas to keep
- Take-home messages
- Source key-points marker
- Why must a heat and moisture exchanger sit close to the patient, and what limits its use?
- References
- Essentials of Equipment in Anaesthesia, Critical Care, and Perioperative Medicine