title: Williams syndrome: masseter spasm during anaesthesia.
abstract: A 4-year-old boy with Williams syndrome developed masseter spasm after halothane and suxamethonium. He did not develop malignant hyperthermia; the surgery was accomplished with a nontriggering anaesthetic and no further problems.
authors.affiliation: Department of Anaesthesia, Auckland Area Health Board, New Zealand.
authors.forename: J
authors.initials: J
authors.lastname: Patel
authors.forename: M J
authors.initials: MJ
authors.lastname: Harrison
mesh_terms: D000769:Anesthesia, Inhalation; D001024:Aortic Valve Stenosis; D002675:Child, Preschool; D005145:Face / Q000002:abnormalities*; D006221:Halothane; D006801:Humans; D008607:Intellectual Disability; D008297:Male; D008406:Masseter Muscle; D013035:Spasm / Q000209:etiology*; D013285:Strabismus / Q000601:surgery; D013390:Succinylcholine; D013577:Syndrome
chemical_list: D013390:Succinylcholine; D006221:Halothane