title: Flapper valve malfunction.
authors.forename: J B
authors.initials: JB
authors.lastname: Eisenkraft
authors.forename: R M
authors.initials: RM
authors.lastname: Sommer
mesh_terms: D000328:Adult; D000764:Anesthesia, Closed-Circuit / Q000295:instrumentation*; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D004868:Equipment Failure; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012122:Ventilators, Mechanical