Topical anaesthesia in upper gastrointestinal endoscopy.
D000772:Anesthesia, Local / Q000379:methods*; D016099:Endoscopy, Gastrointestinal; D006801:Humans; D008012:Lidocaine / Q000009:adverse effects*; D008708:Methemoglobinemia / Q000139:chemically induced*
D008012:Lidocaine