Methemoglobinemia: A Rare Entity Caused by Commonly Used Topical Anesthetic Agents, a Case Report

Prashanth Rawla, Jeffrey Pradeep Raj

Abstract


Benzocaine, a topical anesthetic agent, is widely used during short procedures like endoscopy, endotracheal intubation and likewise. Here we report a case of benzocaine spray-induced methemoglobinemia in an adult male patient during the transesophageal echocardiography (TEE) presenting as hypoxia and improved subsequently in the next 2 h on low-dose intravenous methylene blue. Causality assessment of the adverse event was probable, and preventability assessment was unpreventable. The patient was discharged with no further complications at good health. A relevant etiopathology and managing principles are summarized in this case report such that it serves as an awareness to all medical fraternity about this unexpected yet life-threatening adverse drug reaction to an otherwise safe local anesthetic.




J Hematol. 2017;6(4):87-89
doi: https://doi.org/10.14740/jh325w


Keywords


Methemoglobinemia; Benzocaine; Topical anesthetics

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Journal of Hematology, quarterly, ISSN 1927-1212 (print), 1927-1220 (online), published by Elmer Press Inc.            
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