Bako P1*, Nemeth A1, Molnar K2, Toth T1, Harmat K1, Rath G3 and Gerlinger I1
1Department of Otorhinolaryngology, Head and Neck Surgery, University of Pécs, Hungary
2Department of Radiology, University of Pécs, Hungary
3Department of Pediatrics, University of Pécs, Hungary
Aim: To successfully analyze the surgical and audiological results of cochlear implantation in patients afflicted with inner ear malformations. This study briefly presents our surgical strategies, the selected implants and the audiological results.
Methodology: Objective hearing threshold was measured using an auditory brainstem response and middle latency response audiometry. Structural imaging of high resolution temporal bone computer tomography and inner ear MR scan was performed in support of all patients. Images revealed bilateral cochlear malformation in 7 patients. 3 ears with common cavity deformity, 2 ears with incomplete partition Type I, and 3 ears suffering from cochlear hypoplasia, were all rehabilitated using cochlear implantation. The type of the electrode and the surgical technique were individually determined reflective of the type of malformation. The success of the surgery and potential postoperative complications were duly noted and fully registered. Postoperative audiological measurements were performed and the results were analyzed.
Results: The average audiological follow-up was 40.3 months. The average free field, pure-tone threshold of speech frequencies (0.5 kHz to 3 kHz) gained postoperatively were within the range of 32.5 dB to 41.6 dB. In two of the procedures, a cerebrospinal fluid gusher did occur and was successfully managed intra-operatively, all without any postoperative complications.
Conclusion: Temporal bone high resolution CT and inner ear MRI imaging are mandatory to detect and characterize the inner ear malformation. Early implantation of malformed cochlea is crucial towards achieving ideal postoperative audiological results. Notably, an intra-operative gusher is not regarded as a contraindication of the cochlear implantation.
Bako P, Nemeth A, Molnar K, Toth T, Harmat K, Rath G, et al. Cochlear Implantation in Patients Afflicted with Inner Ear Malformations - The Pecs Experience. Ann Clin Otolaryngol. 2018; 3(1): 1033.