Elongated EABR wave latencies observed in patients with auditory neuropathy caused by OTOF mutation. Issue 5 (24th September 2018)

• Record Type: Journal Article
• Authors: Hosoya, Makoto; Minami, Shujiro B.; Enomoto, Chieko; Matsunaga, Tatsuo; Kaga, Kimitaka
• Is Part Of: Laryngoscope investigative otolaryngology. Volume 3:Issue 5(2018)
• Page Start: 388
• Page End: 393
• Publication Date: 2018-09-24
• Subjects: Auditory neuropathy -- OTOF -- electrically evoked auditory brainstem responses; Otolaryngology -- Periodicals; Laryngoscopy -- Periodicals; Otolaryngology; Otolaryngology; Periodicals; Periodicals; 617.51
• DOI: 10.1002/lio2.210
• Languages: English
• ISSNs: 2378-8038

Abstract

Abstract : Objectives: We sought to determine how the pathology altered electrically evoked auditory brainstem responses (EABRs) in patients with hearing loss by evaluating EABRs in auditory neuropathy patients with OTOF mutations comparing with various types of congenital deafness. Methods: We included 15 patients with congenital hearing loss, grouped according to pathology: OTOF mutations (n = 4), GJB2 mutations (n = 4), SLC26A4 mutations (n = 4), or cytomegalovirus infections (n = 3). EABRs were recorded when patients underwent cochlear implantation surgery. We evaluated the latencies and amplitudes of the recorded EABRs and compared them statistically between four groups. Results: The EABR latencies of Wave III and Wave V, and of the interval between them, were significantly longer in the OTOF mutation group than in the GJB2 and SLC26A4 mutation groups (Wave III) and in all three other groups (Wave V and Wave III‐V latency); amplitudes were not significantly different between groups. Conclusions: Our results suggest OTOF mutations cause delayed (or slowed) postsynaptic neurotransmission, although the presumed mechanism involved reduced presynaptic transmission between hair cells and spiral ganglion neurons. Level of Evidence: Mainly a case report