Objectives: (1) To evaluate safety, tolerability, and technical success of lidocaine iontophoresis and a tympanostomy tube placement system for adults in an office setting and (2) to meet regulatory evidence requirements for new drugs and devices.
Study design: Prospective, multicenter, single arm.
Setting: Patients were recruited in 8 community-based practices in the United States between June and September 2017.
Subjects and methods: This study evaluated tympanic membrane anesthesia and tube placement in 30 adults. Anesthesia was achieved via iontophoresis of a lidocaine/epinephrine solution. Tube placement was conducted using an integrated myringotomy and tube delivery system. Tolerability of tube placement was measured using a patient-reported visual analog scale from 0 mm (no pain) to 100 mm (worst possible pain). Mean pain score was compared to a performance goal of 45 mm, where statistical superiority represents mild pain or less. Technical success and safety through 3 weeks postprocedure were evaluated.
Results: Twenty-nine (29/30, 96.7%) patients had tube(s) successfully placed in all indicated ears. One patient demonstrated inadequate tympanic membrane anesthesia, and no tube placement was attempted. The mean (SD) pain score of 9.4 (15.7) mm was statistically superior to the performance goal. There were no serious adverse events. Seven nonserious events were related to device, procedure, or drug: inadequate anesthesia (1), vertigo (1), and dizziness (1) at the time of procedure and ear discomfort (1), tube occlusion (2), and medial tube migration (1) postprocedure.
Conclusion: Lidocaine iontophoresis provides acceptable tympanic membrane anesthesia for safe, tolerable, and successful in-office tube placement using an integrated myringotomy and tube delivery system.
Keywords: iontophoresis; local anesthesia; myringotomy; office surgery; pediatric; tympanostomy tube.
© The Authors 2020.