PMID- 16541780
OWN - NLM
STAT- MEDLINE
DCOM- 20060407
LR  - 20061115
IS  - 0021-4892 (Print)
IS  - 0021-4892 (Linking)
VI  - 55
IP  - 3
DP  - 2006 Mar
TI  - [Auditory evoked potentials].
PG  - 314-21
AB  - Auditory evoked potentials (AEPs) are an electrical manifestation of the brain 
      response to an auditory stimulus. The waveform represents the passage of 
      electrical activity provoked by auditory stimuli from the cochlea to cortex. The 
      waves represented by I-VII are generated mainly in the brainstem. These waves are 
      called the brain stem auditory evoked potentials (BAEPs) or the auditory brain 
      stem response (ABR). The middle latency AEPs (MLAEP) are generated from the 
      medial geniculate and primary auditory cortex. The long latency AEPs (LLAEP) are 
      generated from the frontal cortex and association areas. The BAEPs appear to be 
      an exquisitely sensitive monitor for pathological events during surgery. 
      Anesthetics and mild hypothermia have minimum effect, if any, on the BAEPs. The 
      BAEPs are useful during the microvascular decompression of the fifth or seventh 
      cranial nerve, resection of acoustic neuroma and posterior fossa operations. 
      Because the auditory pathway occupies a small area in the brainstem, combined use 
      of other evoked potentials such as short latency sensory evoked potentials is 
      recommended. The MLAEPs are most promising evoked responses for monitoring 
      awareness or depth of anesthesia. When the concentration of anesthetics is 
      increased, the amplitudes of the MLAEP's peaks are decreased and their latencies 
      are elongated. Commercially developed A-line AEP monitor or aepEX can extract the 
      AEPs waveform in a short period and automatically analyze the changes in the 
      MLAEPs. These AEP based monitors may be superior to bispectral index (BIS) in 
      detecting the transition from unconsciousness to consciousness.
FAU - Morimoto, Yasuhiro
AU  - Morimoto Y
AD  - Department of Anesthesiology-Resuscitology, Yamaguchi University School of 
      Medicine, Ube 755-8505.
FAU - Sakabe, Takefumi
AU  - Sakabe T
LA  - jpn
PT  - English Abstract
PT  - Journal Article
PL  - Japan
TA  - Masui
JT  - Masui. The Japanese journal of anesthesiology
JID - 0413707
RN  - 0 (Anesthetics)
SB  - IM
MH  - Anesthesia
MH  - Anesthetics/pharmacology
MH  - Auditory Pathways/physiology
MH  - Body Temperature
MH  - Brain Diseases/surgery
MH  - *Evoked Potentials, Auditory
MH  - Evoked Potentials, Auditory, Brain Stem/drug effects/*physiology
MH  - Humans
MH  - Monitoring, Intraoperative/*methods
MH  - Reaction Time
EDAT- 2006/03/18 09:00
MHDA- 2006/04/08 09:00
CRDT- 2006/03/18 09:00
PHST- 2006/03/18 09:00 [pubmed]
PHST- 2006/04/08 09:00 [medline]
PHST- 2006/03/18 09:00 [entrez]
PST - ppublish
SO  - Masui. 2006 Mar;55(3):314-21.