Brainstem Auditory Evoked Potentials to Guide Minimally Invasive Decompression in Chiari 1.5: Technical Case Report

Area of Science:

• Neurosurgery
• Neurology
• Medical Devices

Background:

• Chiari malformation types 1 and 1.5 often require posterior fossa decompression.
• Surgical techniques for Chiari malformation vary, with aggressive approaches sometimes used for type 1.5.
• An objective intraoperative marker for adequate decompression is needed to tailor surgical strategies.

Purpose of the Study:

• To investigate the utility of brainstem auditory evoked potentials (BAEPs) as an intraoperative marker for guiding decompression surgery in adult patients with Chiari malformation.
• To evaluate the effectiveness of a minimally invasive surgical approach guided by intraoperative BAEP monitoring for Chiari 1.5.

Main Methods:

• A case study of a 26-year-old female with Chiari 1.5 malformation and associated symptoms.
• The patient underwent a minimally invasive decompression including C1 laminectomy, linear dural opening, and tonsillar cauterization.
• Intraoperative monitoring using BAEPs was employed to guide the extent of decompression.

Main Results:

• Intraoperative BAEP monitoring facilitated a targeted and less extensive surgical decompression.
• The patient experienced significant clinical improvement in symptoms such as migraines, visual disturbances, and balance issues post-surgery.
• The BAEP-guided approach demonstrated potential for optimizing surgical outcomes in adult Chiari decompression.

Conclusions:

• Brainstem auditory evoked potentials (BAEPs) show potential as a valuable intraoperative tool for guiding decompression surgery in adult Chiari malformation patients.
• Minimally invasive decompression guided by BAEPs may lead to significant clinical improvement while minimizing surgical invasiveness.
• Further research is warranted to validate the utility of BAEP monitoring in adult Chiari decompression surgery.