Delayed hearing loss after microvascular decompression for hemifacial spasm
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This study aimed to analyze cases of delayed hearing loss after microvascular decompression (MVD) for hemifacial spasm and identify the characteristic features of these patients.
We retrospectively reviewed the medical records of 3462 patients who underwent MVD for hemifacial spasm between January 1998 and August 2017.
Among these, there were 5 cases in which hearing was normal immediately postoperatively but delayed hearing loss occurred. None of the 5 patients reported any hearing disturbance immediately after the operation. However, they developed hearing problems suddenly after some time (median, 22 days; range 10–45 days). On examination, sensorineural hearing loss was confirmed. High-dose corticosteroid treatment was prescribed. Preoperative hearing levels were restored after several months (median duration from the time of the operation, 45 days; range 22–118 days). Interestingly, the inter-peak latency of waves I–III in the brainstem auditory evoked potential (BAEP) was prolonged during the surgery, but recovered within a short time.
Delayed hearing loss may occur after MVD for HFS. Prolongation of the inter-peak latency of waves I–III seems to be associated with the occurrence of delayed hearing loss. It is possible that BAEP changes may predict delayed hearing loss, but confirmatory evidence is not available as yet. Analysis of more cases is necessary to determine the utility of BAEP monitoring to predict delayed hearing loss after MVD and to identify its exact cause.
KeywordsMicrovascular decompression Hearing loss Brain stem auditory evoked potentials Hemifacial spasm
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee (Institutional Review Board of Samsung Medical Center/SMC 2014-04-028-001) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The requirement for informed consent was waived, as the study used existing clinical data.
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