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Benzocaine-induced methemoglobinemia
P M Gupta1, D S Lala, E L Arsura
1Department of Internal Medicine, University of Virginia School of Medicine, and VA Medical Center, Salem 24153, USA.
Southern Medical Journal
|February 1, 2000
Summary
Topical benzocaine can cause methemoglobinemia, a rare but serious condition. Early diagnosis and treatment are crucial for managing this potentially fatal side effect of topical anesthetics.
Area of Science:
- Anesthesiology
- Toxicology
- Hematology
Background:
- Topical anesthetics are widely used in medical procedures.
- Benzocaine is a common topical anesthetic agent.
- Methemoglobinemia is a rare adverse effect associated with certain medications.
Observation:
- Four cases of methemoglobinemia following topical benzocaine application are presented.
- Patients presented with symptoms indicative of methemoglobinemia.
- The temporal relationship between benzocaine use and symptom onset was noted.
Findings:
- Topical benzocaine use was identified as the causative agent in all four cases.
- The pathophysiology involves the oxidation of hemoglobin.
- Diagnosis relies on clinical presentation and laboratory confirmation of elevated methemoglobin levels.
Implications:
- Healthcare providers using topical anesthetics must be aware of benzocaine-induced methemoglobinemia.
- Prompt recognition and management can prevent severe morbidity and mortality.
- This highlights the importance of understanding the risks associated with common anesthetic agents.