Open AccessSudden onset of static equilibrium dysfunction in patients receiving a cochlear implant
Author(s) -
Ying Gao,
Qing Zhang,
Yan Jin,
Xiaorong Niu,
Peng Han,
Haifeng Yuan,
Juan Hu,
Bo Liu,
Min Xu
Publication year - 2017
Publication title -
medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.59
H-Index - 148
eISSN - 1536-5964
pISSN - 0025-7974
DOI - 10.1097/md.0000000000008465
Subject(s) - medicine , posturography , cochlear implantation , cochlear implant , surgery , implant , otitis , audiology , vestibular system
Background: We investigated the sudden onset of static equilibrium dysfunction caused by cochlear implantation (CI) in congenital hearing loss patients. Method: Twenty-five patients were selected from a cohort of unilateral CI recipients to form the CI group. Static posturography was performed 1 to 3 days before and 3 to 5 days after CI. Each patient underwent the test with eyes open (EO) and eyes closed (EC) for 30 seconds, separately. Another group of age- and sex-matched patients with no history of hearing impairment undergoing unrelated surgeries formed the control group, and were examined with the same tests pre- and post-surgery. A third group of patients undergoing middle ear surgery formed the otitis media (OM) group. Postural sway parameters including sway velocity (SV) in the X -axis, SV in the Y -axis, length of sway locus length (LNG), and environmental area (ENV) were measured and recorded. Results: Comparison of pre-surgery posturographical parameters between the CI and control groups revealed no significant differences. Significant differences were found in most parameters in pre- and post-surgery comparisons in the CI group. Mean SV values in the X -axis pre- and post-surgery were 8.48 and 11.52 mm/s, respectively, in the EO condition ( P < .05), and 14.94 and 20.16 mm/s, respectively, in the EC condition ( P < .05). In the Y -axis, mean SV values were 15.36 and 20.24 mm/s pre- and post-surgery, respectively, in the EC condition ( P < .05). The LNG values in the CI group pre- and post-surgery were 319.60 and 469.88 mm in the EO condition ( P < .05), and 571.40 and 764.12 mm in the EC condition ( P < .05). No significant functional equilibrium change was observed in the control group between pre- and post-surgery ( P > .05) except SV in the X -axis and LNG in the EO condition ( P < .05). No significant pre- and post-surgery differences were found in the OM group. Conclusion: CI appeared to influence static equilibrium function within 1 week post-surgery. This influence was greater when eyes were closed.