Anesthesia breathing system's

Rebreather’s “ circle system”

• Remove CO₂ from exhaled air using a chemical absorbent, then mix the remaining gases with fresh oxygen for the patient to breathe again.

• Reusing gases saves oxygen and anesthetic.

• Helps retain heat and moisture, keeping the patient warm.

• Disadvantages: Bulky, more complex, and has high breathing resistance, making it unsuitable for small animals.

Non rebreathers “Bain system’s”

Non-Rebreathing (Bain) Systems

• Do not reuse exhaled gases; use high gas flow to remove CO₂.

• Lightweight, simple, and low resistance—best for small patients.

• Disadvantages: Higher gas use (more expensive) and increased risk of hypothermia.

trouble shooting

• Check the anesthesia machine before every procedure to prevent problems.

• Look for expired CO₂ absorbent, an empty vaporizer, or a disconnected scavenger system.

• Early detection and correction can save the patient's life.

• Leaks are common—check with a pressure test, especially at tubing and reservoir bag connections.

• Smelling anesthetic gas during a procedure usually means there is a leak.

• One-way valves can stick closed, causing the patient to rebreathe CO₂.

• An incorrectly calibrated vaporizer can cause anesthesia that is too deep or too light.

• After each procedure: Clean and inspect the machine, wash and dry breathing tubes/bags, and clean one-way valves to keep the system safe and working properly.

Pressure test

• Checks for leaks and ensures the pop-off valve works properly.

• Close the pop-off valve, block the patient end, and pressurize the system to 30 cm H₂O.

• If pressure holds, the system is leak-free; if it drops, there is a leak.

• Find leaks by listening, feeling, or using a bubble (surfactant) solution.

• When finished, open the pop-off valve to release pressure and confirm it isn't stuck.