Cochlear Implantation with a Normal Hearing Contralateral Ear
Blasco and Redleaf (2014) note that otologists around the world have used cochlear implants (CIs) as an effective therapy for people presenting with severe-to-profound sudden sensorineural hearing loss (SSNHL) even though the contralateral ear presents with normal hearing. Blasco and Redleaf report that more traditional therapies such as bone-anchored devices and contralateral routing of signal (CROS) provide only minimal benefit for users and those users do worse in noisy backgrounds.
Likewise, Oeding and Valente (2013) reported of the 21 adults in their BICROS study, there were no significant differences in the reception threshold for sentences (RTS) and UNAIDED provided the best RTS scores.
Blasco and Redleaf state that “cochlear implantation for unilateral profound hearing loss with a normal contralateral ear has been practiced in Europe for several years now…our meta-analysis and systematic review of post-implant tinnitus finds that it (tinnitus) is improved by implantation…sentence understanding in noise yielded mixed results…(and)…subjective speech understanding finds that the majority of patients (87 percent) feel that they are understanding speech better after implantation, with improved sound localization (100 percent)….”
For More Information, References, and Recommendations
Blasco MA, Redleaf MI (2014) Cochlear Implantation in Unilateral Sudden Deafness Improves Tinnitus and Speech Comprehension—Meta Analysis and Systematic Review. Otology & Neurotology 35:1426–1432.
Oeding K, Valente M. (2013) Sentence Recognition in Noise and Perceived Benefit of Noise Reduction on the Receiver and Transmitter Sides of a BiCROS Hearing Aid. Journal of the American Academy of Audiology 24(10):980–991.