Abstract:
Objectives: The aim of present study was evaluation of saccular function in cochlear implant candidates with severe to profound sensory neural hearing loss. Before and after cochlear implantation Methods: In this study 35 Cochlear Implant (CI) candidates with bilateral severe to profound sensory neural hearing loss before and about 30 days after cochlear implantation and 20 normal-hearing cases as a control group underwent VEMP test. Both groups were matched based on gender and age. Results: VEMP responses were absent bilaterally in 10 out of 35 patients. 4 patients were excluded from the study because they did not receive CI during present study. From 21 remaining patients, 5 cases lost VEMP response in their implanted ear after surgery. In control group, VEMP responses were present bilaterally. Discussion: The results of present study show that saccular dysfunction in CI candidates is extremely probable and this is possible that saccule get impaired after CI.
Machine summary:
Original Article Evaluation of Saccular Function Pre-Post Cochlear Implant Surgery Using VEMPs Yones Lotfi; Akram Farahan*; Enayatollah Bakhshi University of Social Welfare and Rehabilitation Sciences, Tehran, Iran Abdollah Moossavi Iran University of Medical Sciences, Tehran, Iran Ali Eftekharian Cochlear implant center of Loghman hakim hospital Shahid Beheshti University of medical sciences, Tehran, Iran Mohammad Ajalloian Cochlear implant centre of Baghiyatallahelazam hospital Baghiyatallahelazam University of medical sciences, Tehran, Iran Objectives: The aim of present study was evaluation of saccular function in cochlear implant candidates with severe to profound sensory neural hearing loss.
Before and after cochlear implantation Methods: In this study 35 Cochlear Implant (CI) candidates with bilateral severe to profound sensory neural hearing loss before and about 30 days after cochlear implantation and 20 normal-hearing cases as a control group underwent VEMP test.
Key words: cochlear implant, sensory neural hearing loss, saccule, VEMPs Submitted: 20 September 2015 Accepted: 20 November 2015 Introduction In addition to anatomical proximity, the cochlear and vestibular system has close similarity in embryonic origin and development, microstructure, cellular and neuronal function.
Based on cochlear implant criteria, all cases in this group were CI candidates with bilateral severe to profound hearing loss (≥70 dBHL).
In experimental group VEMP was carried out on all patients before surgery and cases without any response in both ears or in the selected ear for implantation were not re-tested after CI.
In 25 remaining patients, VEMP response (threshold, latency and amplitude) was compared with control group.
57 percent of CI candidates had not any VEMP response and in the remaining patients VEMP parameters including threshold and amplitude were significantly different from control group.