Anesthesia of the tympanic membrane and
ear canal by the use of
iontophoresis of local anesthetics is a
painless and safe method of
Anesthesia for office myringotomy and polyethylene tube insertion, and possibly for surgical use as well. With the use of guinea pig models, the introduction of 4%
lidocaine hydrochloride solution in the middle ear space with iontophoresis revealed no toxic effects on the
eighth nerve, and epinephrine hydrocloride potentiates the effects of lidocaine and has no protective mechanism on the eighth
nerve function.
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