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Updated: Dec 28, 2025
Microvascular Decompression: Salient Surgical Principles and Technical Nuances
Published on: July 5, 2011
Significance of wave I loss of brainstem auditory evoked potentials during microvascular decompression surgery for
Byung-Euk Joo1, Sang-Ku Park2, Min Ho Lee3
1Department of Neurology, Soonchunhyang University Seoul Hospital, Soonchunhyang University College of Medicine, Seoul, Republic of Korea.
Objective:
We sought to define the significance of wave I loss of brainstem auditory evoked potentials (BAEPs) during microvascular decompression (MVD) surgery for hemifacial spasm.
Methods:
Out of 670 patients, 36 showed wave V loss during MVD surgery. These patients were classified into the following two groups based on wave I loss: Total wave loss, including wave I loss, and wave V loss with persistent wave I. We analyzed the differences in postoperative complications between the groups. We also investigated when wave I loss occurred during MVD surgery.
Results:
Of the 36 patients, 24 (66.7%) exhibited wave I persistence and 12 (33.3%) exhibited total wave loss. The patients who showed total wave loss were significantly more likely to exhibit postoperative hearing loss (p = 0.009). In addition, these patients exhibited a significantly higher frequency of postoperative complications such as dizziness and tinnitus (p = 0.002 and p = 0.031, respectively). Total wave loss occurred more frequently after the decompressive procedure of MVD surgery.
Conclusions:
Total wave loss, including wave I loss, was more closely associated with severe postoperative complications. Total wave loss occurred more frequently after the decompressive procedure of MVD surgery.
Significance:
These findings suggest the significance of wave I loss of BAEPs.
Insights
Total wave I loss during microvascular decompression surgery for hemifacial spasm is linked to increased postoperative complications like hearing loss, dizziness, and tinnitus. This finding highlights the significance of monitoring wave I in brainstem auditory evoked potentials (BAEPs).
Area of Science:
- Neurosurgery
- Neurophysiology
- Auditory Evoked Potentials
Background:
- Hemifacial spasm is often treated with microvascular decompression (MVD).
- Brainstem auditory evoked potentials (BAEPs) monitor auditory pathway function during surgery.
Purpose of the Study:
- To determine the significance of wave I loss in BAEPs during MVD surgery for hemifacial spasm.
- To correlate wave I loss with postoperative complications.
Main Methods:
- Analyzed 670 patients undergoing MVD surgery for hemifacial spasm.
- Classified 36 patients with wave V loss into groups based on wave I presence or absence (total wave loss).
- Compared postoperative complications between groups.
Main Results:
- 12 patients (33.3%) experienced total wave I loss, while 24 (66.7%) had persistent wave I.
- Total wave I loss was significantly associated with higher rates of postoperative hearing loss (p=0.009), dizziness (p=0.002), and tinnitus (p=0.031).
- Total wave loss occurred more frequently after the decompressive procedure.
Conclusions:
- Total wave I loss during MVD surgery is a significant predictor of severe postoperative complications.
- Monitoring wave I of BAEPs is crucial for assessing surgical risk in hemifacial spasm patients.
