Infection and the risk of topical anesthetic induced clinically significant methemoglobinemia after transesophageal echocardiography: CME

Srikanth Vallurupalli, Smita Das, Shalini Manchanda

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Background: Methemoglobinemia is a recognized complication of topical anesthesia with benzocaine during transesophageal echocardiography (TEE). Though several risk factors have been described, the importance of individual factors is not known. We performed a retrospective study to identify determinants of the risk of methemoglobinemia. Materials and methods: All patients who underwent TEE with benzocaine topical anesthesia between June 2005 and June 2007 were included in this retrospective study. Results: Of the 886 patients who were included in the study, 140 had active infection (15.8%). The incidence of methemoglobinemia in this group was 2.9% (vs. 0%, P < 0.001). Compared to those without infection, patients in the active infection group were more likely to have a lower hemoglobin (P < 0.001), serum albumin level (P < 0.001), glomerular filtration rate less than 60 ml/min per 1.73 m2 (P < 0.001), higher rates of dialysis (P < 0.001), a higher incidence of malignancy (P = 0.01), and increased use of acetaminophen and sulfa drugs (P < 0.001). However, multivariate logistic regression analysis did not identify any statistically significant covariates. Conclusion: In conclusion, patients with an active systemic infection who undergo TEE are at a higher risk of methemoglobinemia. However, none of the risk factors for methemoglobinemia including active infection reached statistical significance in the regression analysis which has to be interpreted with caution in view of the low event rate.

Original languageEnglish (US)
Pages (from-to)318-323
Number of pages6
JournalEchocardiography
Volume27
Issue number3
DOIs
StatePublished - Mar 2010

Keywords

  • Active infection
  • Benzocaine
  • Local anesthetics
  • Methemoglobinemia
  • Transesophageal echocardiography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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