title: Faulty unidirectional expiratory valve as a cause of rebreathing.
authors.forename: W S
authors.initials: WS
authors.lastname: Yew
authors.forename: N C
authors.initials: NC
authors.lastname: Hwang
mesh_terms: D000764:Anesthesia, Closed-Circuit / Q000295:instrumentation*; D002245:Carbon Dioxide / Q000032:analysis; D004867:Equipment Design; D004868:Equipment Failure; D006801:Humans
chemical_list: D002245:Carbon Dioxide