Safe Use of Baines Circuit in Anesthesia

Circuit Integrity and Safety Checks

The American Society of Anesthesiologists recommends performing an occlusion test on the inner tube and verifying the adjustable pressure limiting (APL) valve can be fully opened and closed before use 1, 2, 3
Visually inspect the Baines circuit for correct configuration and assembly before use, and ensure all connections within the system and to the anesthetic machine are secured by "push and twist" technique 4
Check for leaks or obstructions in the reservoir bags and breathing system, and perform a pressure leak test (between 20-60 cmH₂O) by occluding the patient-end and compressing the reservoir bag 4
Perform an occlusion test on the inner tube to ensure proper function, specifically for Bain-type circuits 1, 2, 3
Verify that the adjustable pressure limiting (APL) valve can be fully opened and closed 1, 3

Always protect the breathing system with a test lung or bag when not in use to prevent intrusion of foreign bodies 4
When changing breathing systems during a case or list, always confirm integrity and correct configuration, particularly important during pediatric cases where breathing systems may be changed frequently 1, 4