Hearing Results of Surgery for Acquired Atresia of the External Auditory Canal
SourceOtology & Neurotology, 40, 5S Suppl 1, (2019), pp. S43-s50
Article / Letter to editor
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Otology & Neurotology
iss. 5S Suppl 1
SubjectRadboudumc 12: Sensory disorders DCMN: Donders Center for Medical Neuroscience; Radboudumc 9: Rare cancers RIHS: Radboud Institute for Health Sciences
OBJECTIVE: To evaluate short- and long-term hearing results of surgery for acquired atresia of the external auditory canal (EAC) in a large patient cohort and to define preoperative audiometric conditions useful for patient counseling. STUDY DESIGN: Retrospective cohort study. SETTING: Academic tertiary referral center. PATIENTS: Seventy-eight ears from 72 patients with postinflammatory acquired atresia of the EAC who underwent canal- and meatoplasty were included. Patients with involvement of the ossicular chain, (syndromic) external ear malformations, or congenital aural atresia were excluded. INTERVENTION: Canal- and meatoplasty. MAIN OUTCOME MEASURES: Mean pure-tone averages of thresholds at 0.5, 1, 2, and 3 kHz (PTA0.5,1,2,3) for air conduction (AC), bone conduction, and air-bone gap (ABG) were calculated preoperatively and at short-term (</=0.55 yr) and long-term follow-up (>0.55 yr). Additionally, the numbers of ears with a closed ABG </=10 dB and </=20 dB, and with Social hearing (defined as: AC PTA0.5,1,2,3 </=35 dB) were assessed. RESULTS: At short-term follow-up AC PTA0.5,1,2,3 improved by 18 dB. Social hearing was obtained in 81% of the ears. Postoperatively, 35% of the ears had a closed ABG </=10 dB, 83% was closed </=20 dB. During follow-up, significant deterioration of 5 to 7 dB occurred for AC thresholds at 0.25, 0.5, and 1 kHz. CONCLUSIONS: Surgery for acquired atresia of the EAC is often beneficial. This study suggests overall advantageous surgery when the preoperative indication criteria ABG PTA0.5,1,2,3 >20 dB and AC PTA0.5,1,2,3 >35 dB are applied.
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