VETgirl Veterinary CE: A review of veterinary anesthesia machines

Summary

In this video, certified veterinary technician Rachel Bassett walks viewers through the setup and operation of anesthesia machines, focusing on the differences between non-rebreathing and rebreathing circuits. She provides practical tips on checking oxygen flow, inspecting vaporizers, and the importance of maintaining a routine. The video also highlights key components such as the Popoff valve, unidirectional valves, soda lime canisters, and scavenge systems, with special attention to leak detection methods. This informative guide aims to reduce anxiety and improve confidence for anyone working with anesthesia equipment.

Takeaways

• 😀 Always follow a consistent routine when setting up the anesthesia machine to avoid mistakes and identify potential problems.
• 😀 Oxygen flow begins from the oxygen supply source, either a small tank or a ceiling drop, and is controlled via the oxygen flow meter.
• 😀 The vaporizer is used to convert liquid anesthetic into gas, which is delivered to the patient. Always check the vaporizer for proper fill and functionality before use.
• 😀 The oxygen flush valve delivers high-velocity oxygen and should not be used while connected to a patient to prevent barotrauma.
• 😀 The inhalation and exhalation valves (unidirectional valves) ensure that fresh gas enters the patient and exhaled gases are removed, preventing rebreathing of waste gases.
• 😀 The soda lime canister absorbs CO2 from exhaled gases, preventing rebreathing of carbon dioxide. Ensure it is properly inspected and replaced when necessary.
• 😀 The pressure manometer should be monitored during anesthesia to ensure positive pressure is maintained during manual ventilation and to prevent injury to the patient.
• 😀 The Popoff valve, also known as the APL valve, should be left open unless giving a manual breath. Never leave it closed to avoid over-pressurizing the system.
• 😀 Leak checks should be performed before starting anesthesia by closing the Popoff valve, inflating the system, and using soapy water to detect leaks in components such as valves and reservoir bags.
• 😀 The scavenge system (either passive or active) is used to remove waste anesthetic gases from the system. Ensure the system is properly set up and not recirculating gas back into the building.
• 😀 The proper selection of a reservoir bag size is critical. Calculate it based on the patient's tidal volume, and ensure it is free of cracks or holes to maintain safe pressure levels.

Q & A

What is the first step in setting up a veterinary anesthesia machine?

The first step is to check that your oxygen tank is on and properly connected, ensuring that the oxygen line is correctly hooked up and the flow meter valve is working properly.

Why is it important to establish a routine when setting up the anesthesia machine?

Establishing a routine ensures that the machine is set up the same way every time, helping to avoid mistakes and allowing for the early identification of potential problems.

What is the purpose of the vaporizer in an anesthesia machine?

The vaporizer is used to convert liquid anesthetic into a gas, which is then delivered to the patient mixed with oxygen.

How do you check the functionality of the vaporizer?

Before use, check the window to ensure the liquid anesthetic is within the recommended levels. Also, ensure that the vaporizer is properly filled and that the drain valve is secure to prevent leaks.

What should you do if you notice liquid anesthetic spilling from the vaporizer?

If you notice liquid anesthetic spilling, check and tighten the drain valve. Also, ensure the vaporizer is not damaged, as trauma can affect the delivery of the anesthetic.

What is the function of the oxygen flush valve?

The oxygen flush valve provides high-pressure oxygen to the system, bypassing the vaporizer. It is used to rapidly fill the system with oxygen but should not be used while connected to the patient due to the risk of barotrauma.

What is a Popoff valve, and why is it important?

The Popoff valve (also known as the APL valve) helps regulate the pressure in the anesthesia circuit. It should always remain open during normal operation to prevent over-pressurization, but it must be closed when delivering a manual breath to the patient.

What is the significance of the soda lime canister in the rebreathing system?

The soda lime canister absorbs exhaled carbon dioxide (CO2) from the patient's breath, allowing the gas to be recycled back into the system for rebreathing.

How do you know when to replace the soda lime canister?

Soda lime should be replaced when it no longer crumbles easily when crushed by hand, or after it has been exposed for 8 hours of use. Some machines also indicate exhaustion by changing the granules' color to purple.

What should you do if you find a leak during the leak check process?

If a leak is found, you should close the Popoff valve, increase the pressure using the oxygen flush valve, and then spray a soapy solution on suspected areas to identify the source of the leak. Common areas include the reservoir bag, flutter valves, and soda lime canister connections.