Abstract
Weingarten et al. describe a case of asymptomatic methemoglobinemia detected by intraoperative blood gas monitoring in a patient who had been using the lidocaine patch 5% ⇓. The authors describe this as “the first report of methemoglobinemia that resulted from chronic use of transdermal lidocaine.” The lidocaine patch is approved for the treatment of postherpetic neuralgia ⇓. Because the lidocaine patch 5% is administered at the site of pain, observations of systemic in addition to local effects following application are of significant interest for monitoring its risk profile. In this respect, we …
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