Study of safety and efficacy of dorsal cochlear nucleus action potential (DNAP) monitoring electrode, facial nerve root evoked electromyography (FREEMG) monitoring electrode and monitoring device.

Study of safety and efficacy of dorsal cochlear nucleus action potential (DNAP) monitoring electrode, facial nerve root evoked electromyography (FREEMG) monitoring electrode and monitoring device. - Study of safety and efficacy of DNAP monitoring electrode, FREEMG monitoring electrode and monitoring device.

Status

Recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-UMIN000020411

Enrollment

Registered

2015-12-31

Start date

2015-06-19

Completion date

Unknown

Last updated

2026-06-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

acoustic neuroma, cerebello-pontine angle meningioma, vertebro-basilar aneurysm, cerebello-pontine angle vascular malformation

Interventions

intraoperative continuous neurophysiological nucleolar and nerve root monitoring electrodes and device

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Inclusion criteria. 1. patients who have cerebella-pontine angle lions and are older than 20 years-old. 2. Cerebello^pontine angle lesions include acoustic neuroma, cerebello-pontine angle meningioma, vertebrobasilar aneurysm and cerebello-pontine angle vascular malformation.

Exclusion criteria

Exclusion criteria: Exclusion those who can not express their decision and intuition.

Design outcomes

Primary

Measure	Time frame
intra-operative last DNAP amplitude and last FREEMG amplitude, the ratio of last DNAP amplitude /initial DNAP amplitude and last FREEMG amplitude /initial FREEMG amplitude, postoperative facial nerve grade, postoperative hearing class	—

Countries

Japan

Contacts

Public ContactHirofumi Nakatomi

University of Tokyo Hospital Department of Neurosurgery

hnakatomi-tky@umin.org03-3815-5411

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026