RESUMEN
CONCLUSION: Candidates for hearing preservation cochlear implant (CI) surgery can be divided into: those who benefit from electrical complement (EC) to remaining hearing and don't require additional amplification, those using a combined electric-acoustic stimulation (EAS) and those with the least amount of residual hearing who benefit from electric-only stimulation (ES) provided via medium length electrode. OBJECTIVES: Patients with a borderline level of residual hearing may benefit from a hybrid electric stimulation and acoustic amplification (EAS) after a cochlear implantation procedure aimed at hearing preservation. However, there is another group of individuals who possess substantial low-frequency residual hearing that is still functional. These partially deaf patients present a 'cliff-like' audiogram and have difficulty in comfortable listening, especially in noisy conditions and are deprived of the full enjoyment of music. METHODS: Eleven adults and seven children were implanted via round window with insertion depth intentionally limited to 18-22 mm. None of them could benefit from hearing aids before surgery and they were considered for EC to their residual hearing. RESULTS: Pure tone audiograms and discrimination scores show benefit from either EC to conserved natural acoustic hearing or EAS. One patient with a loss of functional residual hearing benefited from electrical stimulation (ES) and a standard CI coding strategy.
Asunto(s)
Implantación Coclear , Terapia por Estimulación Eléctrica , Pérdida Auditiva Bilateral/cirugía , Estimulación Acústica , Adolescente , Adulto , Niño , Audición , Humanos , Persona de Mediana EdadRESUMEN
BACKGROUND: Recent developments in the field of electronic hearing prostheses have allowed for the introduction of auditory brainstem implants in patients with neurofibromatosis type 2. CASE REPORT: Bilateral electric stimulation from 2 sequentially placed auditory brainstem implants was applied in a 27-year-old man with neurofibromatosis type 2. CONCLUSIONS: Results of the present case support further application of bilateral electric stimulation from auditory brainstem implants for patients with neurofibromatosis type 2.
Asunto(s)
Implantes Auditivos de Tronco Encefálico , Terapia por Estimulación Eléctrica , Neurofibromatosis 2/terapia , Adulto , Audiometría , Neoplasias del Tronco Encefálico/diagnóstico por imagen , Neoplasias del Tronco Encefálico/fisiopatología , Electrodos , Humanos , Imagen por Resonancia Magnética , Masculino , Neurofibromatosis 2/diagnóstico por imagen , Neurofibromatosis 2/fisiopatología , Sensación , Tomografía Computarizada por Rayos XRESUMEN
Nineteen adults and 9 children who received a unilateral cochlear implant between 2002 and 2007 were included in the study. All subjects were preoperatively diagnosed with significant residual hearing in low frequencies, termed as 'partial deafness', and were implanted according to a 6-step round window surgical technique for partial deafness cochlear implantation. Hearing was preserved to a great extent in the partial deafness cochlear implantation (PDCI) group. After a short period following activation of the cochlear implant, highly significant improvement in the recognition of monosyllabic words was observed. With a developed round window surgical procedure and limited electrode insertion, hearing can be preserved in the majority of patients with partial deafness. PDCI is a feasible means of treating individuals who have good low-frequency hearing but severe to profound hearing loss in the mid to high frequencies.