Handheld cochlear nerve action potential mapping for real-time functional navigation in vestibular schwannoma surgery

Hearing preservation in vestibular schwannoma (VS) surgery remains challenging due to frequent cochlear nerve displacement and the limited reliability of brainstem auditory evoked potentials (BAEPs) once waveforms deteriorate. This study evaluated the feasibility and clinical utility of bipolar handheld cochlear nerve action potential (CNAP) mapping for intraoperative nerve identification and compared its prognostic...

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✦ The floor

Discussion

Signed responses from readers of the wire.

✦ Clinical Takeaway ✦

Real-time cochlear nerve action potential mapping with a handheld probe is a promising intraoperative tool for hearing preservation in vestibular schwannoma surgery, but clinical adoption should await larger prospective validation studies.

✦ Why It Matters ✦

Hearing preservation remains one of the most challenging goals in vestibular schwannoma surgery, and a practical handheld nerve-mapping tool could meaningfully shift intraoperative decision-making.

✦ Key Points ✦

01Handheld cochlear nerve action potential (CNAP) mapping provided real-time functional feedback during vestibular schwannoma resection.
02The tool aims to reduce iatrogenic hearing loss by identifying functional nerve segments intraoperatively.
03Published in Journal of Neurosurgery, indicating peer-reviewed surgical/neuroscience focus.
04Approach may complement existing electrophysiologic monitoring techniques such as ABR and ECOG.
05Clinical utility depends on further validation of mapping accuracy and hearing outcome correlations.

✦ Claims & Evidence ✦

ClaimEvidenceSupport

Handheld cochlear nerve action potential mapping can serve as a real-time functional navigation tool during vestibular schwannoma surgery.

studypartially supported

The mapping technique improves hearing preservation outcomes during vestibular schwannoma resection.

studyunclear

✦ Research metadata ✦

PMID: 42696771
DOI: 10.3171/2026.3.JNS252763.
Journal: Journal of Neurosurgery
Publication type: research_article
Evidence level: 4
Population: Patients undergoing vestibular schwannoma surgery
Intervention: Handheld cochlear nerve action potential (CNAP) mapping for real-time intraoperative functional navigation

Primary outcomes

Feasibility and accuracy of real-time cochlear nerve action potential mapping; Hearing preservation rates during vestibular schwannoma resection

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