title: Circuit obstruction.
authors.forename: J
authors.initials: J
authors.lastname: Choi
authors.forename: G M
authors.initials: GM
authors.lastname: Cooper
mesh_terms: D000402:Airway Obstruction / Q000209:etiology*; D000769:Anesthesia, Inhalation / Q000295:instrumentation*; D002675:Child, Preschool; D004868:Equipment Failure; D006801:Humans; D007431:Intraoperative Complications; D008297:Male; D008397:Masks; D041361:Pacifiers / Q000009:adverse effects*