Benzocaine-induced methemoglobinemia--two case reports related to transesophageal echocardiography premedication.
Benzocaine-induced methemoglobinemia is a potentially life-threatening complication. We report two cases of methemoglobinemia due to topical benzocaine spray used as premedication for transesophageal echocardiography. A high index of suspicion is needed for this readily treatable condition.
Division of Cardiology, San Francisco General Hospital Medical Center, University of California, USA.
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Nanevicz
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Yee
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Figueredo
D000284:Administration, Oral; D000779:Anesthetics, Local / Q000009:adverse effects*; D001566:Benzocaine / Q000009:adverse effects*; D017548:Echocardiography, Transesophageal; D005260:Female; D006801:Humans; D008708:Methemoglobinemia / Q000139:chemically induced*; D008875:Middle Aged; D011292:Premedication / Q000009:adverse effects*
D000779:Anesthetics, Local; D001566:Benzocaine