title: Methemoglobinemia from topical benzocaine.
abstract: Acute cyanosis and methemoglobinemia developed following topical application and partial ingestion of benzocaine for esophagogastroduodenoscopy. A diagnosis of acute toxic methemoglobinemia should be considered when cyanosis, with or without neurologic symptoms, occurs following the use of local anesthetics in the absence of cardiopulmonary disease. Laboratory tests should include oxygen saturation and methemoglobin concentration. Management includes supplemental oxygen administration and intravenous methylene blue.
authors.affiliation: Department of Anesthesia, University of Cincinnati, Ohio 45267-0531.
authors.forename: D F
authors.initials: DF
authors.lastname: Grum
authors.forename: T W
authors.initials: TW
authors.lastname: Rice
mesh_terms: D000287:Administration, Topical; D001566:Benzocaine / Q000008:administration & dosage / Q000009:adverse effects*; D003490:Cyanosis / Q000139:chemically induced; D004724:Endoscopy; D005260:Female; D006801:Humans; D008708:Methemoglobinemia / Q000139:chemically induced* / Q000188:drug therapy; D008875:Middle Aged
chemical_list: D001566:Benzocaine