Single-Sided Deafness and Cochlear Implants
Van Zon et al (2015) report a systematic review of the professional literature to determine the likely outcome for people with single-sided deafness (SSD, or asymmetric hearing loss, AHL) who undergo cochlear implantation in the worse ear. The authors note that the most common clinical solutions for people with SSD or AHL includes contralateral routing of signal (CROS) or bone-conduction (BC) devices. However, neither solution (CROS or BC devices) provides bilateral auditory input, whereas CIs offer a widely accepted solution that does provide actual bilateral auditory input and binaural hearing.
Van Zon et al reviewed PubMed, Embase, Cochrane Library, and more, and of 781 identified articles, 15 satisfied the inclusion criteria and included data on the specific outcomes of interest (speech perception in noise, sound localization, quality of life (QoL) and tinnitus) yielding a report based on (a combined) 112 patients.
The authors note that there were “no high-level-of-evidence studies concerning cochlear implantation in patients with SSD or AHL.” Nonetheless, they concluded the literature does suggest important benefits for people with SSD/AHL secondary to CI implantation, with specific regard to QoL, sound localization and tinnitus management.
For More Information, References, and Recommendations
Arndt S, Aschendorff. Laszig R, Beck R, Schild C, Kroeger S, Ihorst G, Wesarg T. (2011) Comparison of Pseudobinaural Hearing to Real Binaural Hearing Rehabilitation After Cochlear Implantation in Patients With Unilateral Deafness and Tinnitus. Otology & Neurotology 32(1):39-47
Baguley DM. (2010) Cochlear Implants in Single-Sided Deafness and Tinnitus. Seminars in Hearing 31(4):410-413.
Buechner A, Brendel M, Lesinki-schiedat A, Wenzel G, Frohne-Buechner C, Jaeger B, Lenarz, T. (2010) Cochlear Implantation in Unilateral Deaf Subjects Associated With Ipsilateral Tinnitus. Otology & Neurotology 31(9):1381-1385
Van Zon A, Peters JPM, Stegeman I, Smit AL, Grolman W. (2015) Cochlear Implantation for Patients with Single-Sided Deafness or Asymmetrical Hearing Loss—A Systematic Review of the Evidence. Otology & Neurotology 36:209-219