title: Hypercapnia due to absence of unidirectional expiratory valve in anesthesia system.
authors.affiliation: Chang Gung Memorial Hospital, Kaohsiung.
authors.forename: T D
authors.initials: TD
authors.lastname: Tan
authors.forename: L C
authors.initials: LC
authors.lastname: Yap
authors.forename: B
authors.initials: B
authors.lastname: Jawan
authors.forename: J H
authors.initials: JH
authors.lastname: Lee
mesh_terms: D000293:Adolescent; D000769:Anesthesia, Inhalation / Q000009:adverse effects* / Q000295:instrumentation*; D004868:Equipment Failure; D006801:Humans; D006935:Hypercapnia / Q000209:etiology*; D008297:Male