Auditory Nerve Compound Action Potentials and Brain Stem Auditory Evoked Potentials in Patients with Various Degrees of Hearing Loss

1991 ◽  
Vol 100 (6) ◽  
pp. 488-495 ◽  
Author(s):  
Aage R. Møller ◽  
Peter J. Jannetta ◽  
Margareta B. Møller ◽  
Hae Dong Jho
Keyword(s):  
Hearing Loss ◽  
Evoked Potentials ◽  
Brain Stem ◽  
Auditory Nerve ◽  
Action Potentials ◽  
Auditory Evoked Potentials ◽  
Compound Action Potentials ◽  
Compound Action

Monitoring Auditory Nerve Potentials during Operations in the Cerebellopontine Angle

1984 ◽  
Vol 92 (4) ◽  
pp. 434-439 ◽  
Author(s):  
Aage R. Øller ◽  
Peter J. Jannetta
Keyword(s):  
Hearing Loss ◽  
Evoked Potentials ◽  
Brain Stem ◽  
Microvascular Decompression ◽  
Auditory Nerve ◽  
Cerebellopontine Angle ◽  
Auditory Evoked Potentials ◽  
Cranial Nerves

Direct monitoring of auditory nerve potentials was performed in 19 patients undergoing retromastoid craniectomy and microvascular decompression of cranial nerves. In addition, brain stem auditory evoked potentials (BSEPs) were monitored in these patients. No patient suffered significant hearing loss. Direct monitoring of auditory nerve potentials complements the recording of BSEPs because the auditory nerve potentials can be visualized without averaging many responses. Therefore the effect of any intraoperative manipulation that is harmful to the auditory nerve can be detected instantaneously.

Neural Generators of Brainstem Evoked Potentials Results from Human Intracranial Recordings

1981 ◽  
Vol 90 (6) ◽  
pp. 591-596 ◽  
Author(s):  
Aage R. Møsller ◽  
Peter J. Jannetta ◽  
Margareta B. Møsller
Keyword(s):  
Evoked Potentials ◽  
Auditory Nerve ◽  
Action Potentials ◽  
Compound Action Potential ◽  
Main Peak ◽  
Negative Wave ◽  
Compound Action Potentials ◽  
Brainstem Evoked Potentials ◽  
Intracranial Recordings ◽  
Compound Action

Recordings were made from the auditory nerve near its entrance into the brainstem during neurosurgical operations for cranial nerve disorders. The recorded compound action potentials in response to 2000 Hz tonebursts at 90 dB were characterized by a negative peak with a latency of 3.0 to 3.7 ms. When these compound action potentials were compared with the brainstem evoked potentials (BSEP) recorded from the scalp during the operation or before the operation, it was found that the latency of the main peak of the compound action potential matched the latency of the vertex negative wave located between waves II and III (P2) and the potentials recorded from the nerve were found to match the N2P2N3 complex of the scalp-recorded BSEP. The results indicate that the auditory nerve is the neural generator of the two first peaks in the human BSEP, in contrast to the results of experiments in animals which show that the second peak originates in the cochlear nucleus.

scholarly journals Compound Action Potentials Evoked by Speech Stimuli in Sensory Hearing Loss.

1996 ◽  
Vol 39 (3) ◽  
pp. 204-208
Author(s):  
Shogo Shinohara ◽  
Kazuhiko Shoji ◽  
Hisayoshi Kojima ◽  
Koji Miyata ◽  
Iwao Honjo
Keyword(s):  
Hearing Loss ◽  
Action Potentials ◽  
Speech Stimuli ◽  
Compound Action Potentials ◽  
Compound Action

182. Early detection of hearing loss by means of brain stem auditory evoked potentials

2008 ◽  
Vol 119 (9) ◽  
pp. e144
Author(s):  
E.B. Nuñez ◽  
R.M. Pérez ◽  
M. Amador ◽  
S. Batista
Keyword(s):  
Hearing Loss ◽  
Early Detection ◽  
Evoked Potentials ◽  
Brain Stem ◽  
Auditory Evoked Potentials

Intraoperative monitoring of brain-stem auditory evoked potentials

1982 ◽  
Vol 57 (5) ◽  
pp. 674-681 ◽  
Author(s):  
Betty L. Grundy ◽  
Peter J. Jannetta ◽  
Phyllis T. Procopio ◽  
Agnes Lina ◽  
J. Robert Boston ◽  
...  
Keyword(s):  
Evoked Potentials ◽  
Brain Stem ◽  
Auditory Nerve ◽  
Intraoperative Monitoring ◽  
Cerebellopontine Angle ◽  
Auditory Evoked Potentials ◽  
Irreversible Loss ◽  
Content Type ◽  
Complete Obliteration ◽  
Fine Print

✓ Brain-stem auditory evoked potentials (BAEP) were monitored during 54 neurosurgical operations in the cerebellopontine angle. The BAEP were irreversibly obliterated in five patients who required deliberate section of the auditory nerve. Technical difficulties interfered with monitoring in three cases, and three patients had deafness and absent BAEP preoperatively. Reversible alterations in BAEP were seen during 32 operations, with recovery after as long as 177 minutes of virtually complete obliteration. Changes in BAEP were associated with surgical retraction, operative manipulation, positioning of the head and neck for retromastoid craniectomy, and the combination of hypocarbia and moderate hypotension. In 19 cases, waveforms improved after specific interventions made by the surgeon or anesthesiologist because of deteriorating BAEP. In 13 other cases, BAEP recovered after maneuvers not specifically related to the electrophysiological monitoring, most often completion of operative manipulation. Whenever BAEP returned toward normal by the end of anesthesia, even after transient obliteration, hearing was preserved. Irreversible loss of BAEP occurred only when the auditory nerve was deliberately sacrificed. The authors conclude that monitoring of BAEP may help prevent injury to the auditory nerve and brain stem during operations in the cerebellopontine angle.

Delayed and Progressive Hearing Loss after Microvascular Decompression of Cranial Nerves

1996 ◽  
Vol 105 (2) ◽  
pp. 158-161 ◽  
Author(s):  
Takeo Fuse ◽  
Margareta B. Møller
Keyword(s):  
Hearing Loss ◽  
Evoked Potentials ◽  
Brain Stem ◽  
Microvascular Decompression ◽  
Cranial Nerve ◽  
Auditory Evoked Potentials ◽  
Cranial Nerves ◽  
Reflex Response ◽  
Eighth Cranial Nerve ◽  
Progressive Hearing Loss

An unusual case of unilateral delayed and progressive hearing loss following a microvascular decompression operation on cranial nerves V, VII, and VIII on the left side is reported. Preoperative and postoperative audiologic evaluation revealed a mild high-frequency hearing loss for both ears, normal thresholds for the acoustic middle ear reflex response, and normal brain stem auditory evoked potentials. Three years after this microvascular decompression procedure, the patient noticed slowly decreasing hearing in her left ear, and subsequent serial audiograms revealed a progressive sensorineural hearing loss and a decrease in her speech discrimination score. Brain stem auditory evoked potentials showed progressive changes. Because of the patient's increasing symptoms of vertigo and tinnitus in the left ear, reexploration of the eighth cranial nerve was performed 5½ years after the initial procedure. This second operation revealed reactive tissue around the eighth cranial nerve that was atrophic and yellow. We interpret the delayed and progressive hearing loss to be a result of reactive scar tissue and progressive atrophy of the auditory nerve.

Deterioration of auditory evoked potentials during cerebellopontine angle manipulations

1985 ◽  
Vol 63 (4) ◽  
pp. 598-607 ◽  
Author(s):  
Tetsuji Sekiya ◽  
Takashi Iwabuchi ◽  
Shigeki Kamata ◽  
Takashi Ishida
Keyword(s):  
Evoked Potentials ◽  
Brain Stem ◽  
Real Time ◽  
Action Potentials ◽  
Cerebellopontine Angle ◽  
Auditory Evoked Potentials ◽  
Cochlear Nerve ◽  
Cerebellar Hemisphere ◽  
Common Finding ◽  
Interpeak Latency

✓ Evoked action potentials from the internal auditory meatus portion of the cochlear nerve (IAM-EAP's) and brain-stem auditory evoked potentials (BAEP's) from the vertex were simultaneously recorded during cerebellopontine angle (CPA) manipulations (retractions of the cerebellar hemisphere and the cochlear nerve) in dogs. The BAEP changes noted in these dogs were the same as those seen in patients. The IAM-EAP's showed graded deterioration related to BAEP changes. The results are as follows: 1) Prolongation of the I–V interpeak latency of BAEP's, the most common finding during CPA manipulations, is the reflection of prolongation of the I–II interpeak latency, which is caused by conduction impairment or block of the nerve impulses between the extracranial portion of the cochlear nerve and the brain stem. The operative manipulations representing stretch or compression injury to the cochlear nerve in the CPA leads to an acute traumatic cranial nerve root lesion — a retrocochlear lesion. 2) The obliteration of all BAEP components including wave I cannot be caused by conduction block. This is caused by occlusion of the internal auditory artery. Wave I of the BAEP's and the P1-N1 complex of the IAM-EAP's are important indicators of cochlear blood flow during surgical intervention. 3) As possible causes of internal auditory artery obstruction, mechanical distortion of the relationship between the anterior inferior cerebellar artery (AICA) and the internal auditory artery at the junctional portion, mechanical vasospasm of the AICA-internal auditory artery complex, and ensuing noreflow phenomena are discussed. 4) Evoked action potentials are expected to be a useful intraoperative real-time monitor during CPA surgery that can detect rapid changes derived from cochlear artery insufficency. The real-time aspects can overcome some of the disadvantages of BAEP monitoring.

Sign in / Sign up

Export Citation Format

Share Document