The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery.
<h4>Objective</h4>This study aimed to investigate the optimal and safe intensity for facial nerve stimulation during middle ear surgery.<h4>Methods</h4>Thirty-seven patients who had their facial nerve exposed prior to surgery were prospectively enrolled in this study, and ele...
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doaj-1c9d97b62e564bde82a49b106d16b1802021-03-04T10:25:05ZengPublic Library of Science (PLoS)PLoS ONE1932-62032019-01-01148e022174810.1371/journal.pone.0221748The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery.Euyhyun ParkHyunjung KimHye Min HanIn Hak ChoiHak Hyun JungGi Jung Im<h4>Objective</h4>This study aimed to investigate the optimal and safe intensity for facial nerve stimulation during middle ear surgery.<h4>Methods</h4>Thirty-seven patients who had their facial nerve exposed prior to surgery were prospectively enrolled in this study, and electromyography (EMG) recordings were obtained from the orbicularis oculi and orbicularis oris muscles. Four pigs were also enrolled in an animal study, and continuous stimulation was performed on the facial nerves of the pigs for 10 minutes. The EMG responses were measured and the pathologic outcomes of the facial nerve after stimulation were determined.<h4>Results</h4>In the human study, the mean intensity of the minimal electrical stimulation threshold was 0.21 mA (range: 0.1-0.3 mA). A linear correlation was observed between stimulus intensity and response amplitude for intensities below 0.4 mA. Response amplitudes reached a plateau between 0.4 mA and 1.0 mA. The minimal stimulus intensity that could generate a maximal response was 0.4 mA in the orbicularis oculi (244 μV) and orbicularis oris (545 μV). In the animal study, there were no observed changes in EMG or nerve damage incidence after the continuous stimulation of 3.0 mA.<h4>Conclusions</h4>0.4 mA is considered to be the optimal intensity of facial nerve stimulation during middle ear surgery, and it was estimated through the animal study that a stimulation of 3.0 mA is safe from facial nerve damage.https://doi.org/10.1371/journal.pone.0221748 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Euyhyun Park Hyunjung Kim Hye Min Han In Hak Choi Hak Hyun Jung Gi Jung Im |
spellingShingle |
Euyhyun Park Hyunjung Kim Hye Min Han In Hak Choi Hak Hyun Jung Gi Jung Im The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery. PLoS ONE |
author_facet |
Euyhyun Park Hyunjung Kim Hye Min Han In Hak Choi Hak Hyun Jung Gi Jung Im |
author_sort |
Euyhyun Park |
title |
The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery. |
title_short |
The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery. |
title_full |
The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery. |
title_fullStr |
The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery. |
title_full_unstemmed |
The optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery. |
title_sort |
optimal and safe intensity for facial nerve stimulation during intraoperative neuromonitoring in middle ear surgery. |
publisher |
Public Library of Science (PLoS) |
series |
PLoS ONE |
issn |
1932-6203 |
publishDate |
2019-01-01 |
description |
<h4>Objective</h4>This study aimed to investigate the optimal and safe intensity for facial nerve stimulation during middle ear surgery.<h4>Methods</h4>Thirty-seven patients who had their facial nerve exposed prior to surgery were prospectively enrolled in this study, and electromyography (EMG) recordings were obtained from the orbicularis oculi and orbicularis oris muscles. Four pigs were also enrolled in an animal study, and continuous stimulation was performed on the facial nerves of the pigs for 10 minutes. The EMG responses were measured and the pathologic outcomes of the facial nerve after stimulation were determined.<h4>Results</h4>In the human study, the mean intensity of the minimal electrical stimulation threshold was 0.21 mA (range: 0.1-0.3 mA). A linear correlation was observed between stimulus intensity and response amplitude for intensities below 0.4 mA. Response amplitudes reached a plateau between 0.4 mA and 1.0 mA. The minimal stimulus intensity that could generate a maximal response was 0.4 mA in the orbicularis oculi (244 μV) and orbicularis oris (545 μV). In the animal study, there were no observed changes in EMG or nerve damage incidence after the continuous stimulation of 3.0 mA.<h4>Conclusions</h4>0.4 mA is considered to be the optimal intensity of facial nerve stimulation during middle ear surgery, and it was estimated through the animal study that a stimulation of 3.0 mA is safe from facial nerve damage. |
url |
https://doi.org/10.1371/journal.pone.0221748 |
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