Butyrylcholinesterase deficiency is characterized by prolonged apnea after the use of muscle relaxants ( suxamethonium or mivacurium ) in patients who have mutations in the BCHE gene .
B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O O O B-DiseaseOrPhenotypicFeature O O O O B-ChemicalEntity I-ChemicalEntity O B-ChemicalEntity O B-ChemicalEntity O O B-OrganismTaxon O O O O O B-GeneOrGeneProduct O O