Use of trans-tympanic electrically evoked auditory brainstem responses (TT-EABR) in decision making of cochlear implants in hypoplastic auditory nerve cases

Cochlear Nerve Deficiency, particularly Hypoplastic Auditory Nerve (HAN), creates uncertainty regarding Cochlear Implant (CI) outcomes. This study evaluated the utility of Transtympanic Electrically Evoked Auditory Brainstem Response (TT-EABR) in managing HAN cases.

TT-EABR shows potential as a pre-implant decision-making tool for cochlear nerve deficiency cases, but audiologists should await larger prospective studies before changing implant candidacy protocols.

Cochlear nerve deficiency is one of the most challenging candidacy decisions in cochlear implantation; a reliable pre-surgical electrical test could reduce failed implant outcomes and improve patient selection.

1. 01TT-EABR (trans-tympanic electrically evoked auditory brainstem response) evaluated for cochlear implant candidacy in hypoplastic auditory nerve cases.
2. 02Cochlear nerve deficiency (CND) is a leading cause of poor cochlear implant outcomes in children.
3. 03The test electrically stimulates the cochlea through the eardrum to assess nerve viability before surgery.
4. 04Study design is likely a small case series or retrospective cohort — limits generalizability.
5. 05Could help avoid implantation in patients unlikely to benefit, reducing surgical risk and cost.

PMID

42394355

DOI

10.1080/14670100.2026.2690696.

Journal

Cochlear Implants International

Publication type

research_article

Evidence level

4

Population

Patients with hypoplastic auditory nerve / cochlear nerve deficiency being evaluated for cochlear implantation

Intervention

Trans-tympanic electrically evoked auditory brainstem response (TT-EABR)