Auditory Evoked Potential and Psychiatry

1988 ◽  
Vol 33 (6) ◽  
pp. 552-554
Author(s):  
Jacques Thivierge ◽  
Yves Julien
Keyword(s):  
Laboratory Tests ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Loss Of Consciousness ◽  
Review Of The Literature ◽  
Auditory Evoked Response ◽  
Impaired Memory ◽  
Mental Symptoms ◽  
Car Accident ◽  
Neuropsychological Findings

An adolescent was implied in a car accident in which he suffered a head trauma without any substantial loss of consciousness. The posttraumatic syndrome was characterized by headaches and mental symptoms: nervousness, feelings of depersonalization, impaired memory, difficulty in concentration. Neurological examination and laboratory tests have always been normal but for a large perduring asymmetry at the Cortical Auditory Evoked Response. This finding is commented in the light of a review of the literature and of some neuropsychological findings.

Performance of the ARX-derived Auditory Evoked Potential Index as an Indicator of Anesthetic Depth

2002 ◽  
Vol 96 (4) ◽  
pp. 803-816 ◽  
Author(s):  
Michel M. R. F. Struys ◽  
Erik Weber Jensen ◽  
Warren Smith ◽  
N. Ty Smith ◽  
Ira Rampil ◽  
...  
Keyword(s):  
Bispectral Index ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Noxious Stimulus ◽  
Gynecologic Surgery ◽  
Effect Compartment ◽  
Loss Of Consciousness ◽  
Anesthetic Depth ◽  
Effect Site ◽  
Effect Site Concentration

Background Autoregressive modeling with exogenous input of middle-latency auditory evoked potential (A-Line autoregressive index [AAI]) has been proposed for monitoring anesthetic depth. The aim of the current study was to compare the accuracy of this new index with the Bispectral Index (BIS), predicted effect-site concentration of propofol, and hemodynamic measures. Methods Twenty female patients scheduled for ambulatory gynecologic surgery received effect compartment controlled infusion of propofol. Target effect-site concentration was started at 1.5 microg/ml and increased every 4 min by 0.5 microg/ml. At every step, sedation level was compared with monitoring values using different clinical scoring systems and reaction to noxious stimulus. Results Bispectral Index, AAI, and predicted propofol effect-site concentration were accurate indicators for the level of sedation and loss of consciousness. Hemodynamic variables were poor indicators of the hypnotic-anesthetic status of the patient. BIS correlated best with propofol effect-site concentration, followed by AAI. Hemodynamic measurements did not correlate well. No indicators predicted reaction to noxious stimulus. Poststimulus, BIS and AAI showed an increase as a result of arousal. This reaction occurred more rapidly with the AAI than with BIS. Conclusion Bispectral Index, AAI, and predicted propofol effect-site concentration revealed information on the level of sedation and loss of consciousness but did not predict response to noxious stimulus.

Electrophysiologic Correlates of Attention versus Distraction in Young and Elderly Listeners

2002 ◽  
Vol 13 (07) ◽  
pp. 383-391 ◽  
Author(s):  
Albert R. De Chicchis ◽  
Michael Carpenter ◽  
Jerry L. Cranford ◽  
Murvin R. Hymel
Keyword(s):  
Selective Attention ◽  
Evoked Potential ◽  
The Elderly ◽  
Auditory Evoked Potential ◽  
Competition Effect ◽  
Specific Target ◽  
Attention Effect ◽  
Competition Effects ◽  
Significant Attention ◽  
Versus Stimulus

This study examined the effects of selective attention versus stimulus competition on the late auditory evoked potential (LAEP) in 20 young and 20 elderly listeners. In a series of test runs, different oddball tonal sequences were presented to one or both ears, and listeners were instructed to attend to tones at a specific target ear. Peak amplitudes were recorded for the N1, P2, and the early and late N2 components of the LAEP. Significant attention effects were found for all four components. N1 amplitudes increased significantly when participants attended to the target stimuli, whereas the amplitudes of P2, N2e, and N2l decreased. For all LAEP components except N2l, the attention effect did not differ between young and elderly listeners. Significant competition effects also were found for all four components. Amplitudes were significantly larger in monaural than binaural conditions for all components except N2l. The magnitude of this competition effect also was significantly larger for the young listeners than the elderly for all components except N1. These results suggest that the ability to attend selectively to sounds may be more resistant to normal aging than are effects related to stimulus competition.

scholarly journals The effect of early versus late lipid infusion in parenteral nutrition on the biochemical and cortical auditory evoked potential parameters in preterm neonates

2019 ◽  
Vol 67 (1) ◽  
Author(s):  
Rania Mohamed Abdou ◽  
Hoda Mahmoud Ibrahim Weheiba
Keyword(s):  
Weight Gain ◽  
Parenteral Nutrition ◽  
Biochemical Parameters ◽  
Evoked Potential ◽  
Demographic Data ◽  
Auditory Evoked Potential ◽  
Preterm Neonates ◽  
Lipid Infusion ◽  
Significant Difference ◽  
Cortical Auditory Evoked Potential

Abstract Background As brain activity depends greatly on the functions provided by lipid membranes, dietary fat in early life can affect the developing nervous system. Despite the adoption of an early more aggressive parenteral nutrition approach with amino acid infusions still reluctance to the early use of intravenous lipids in neonates. Aim To compare the effect of delayed versus early introduction of intravenous lipid in preterm on the biochemical parameters and on brain development by the cortical auditory evoked potential (CAEP) latency and amplitude. Methods This is a comparative study included 49 neonates admitted at the ain shams university NICUs. Participants were divided into two groups: 26 in group of early lipid infusion and 23 in late lipid infusion, Demographic data, and biochemical parameters were documented during the 1st 2 weeks of life. The CAEP was performed at age of 6 months. The latency and amplitude of P1 were recorded and compared between both groups. Results In the present work we found that group of early lipid infusion had reach their full oral intake earlier with shorter duration of parenteral nutrition and length of stay. They had better weight gain and significantly better glucose level control than group of late lipid infusion. There was no significant difference in the other chemical parameters between both groups expect for the higher incidence of cholestasis in the group of late lipid infusion. At 6 months of age, the group of early lipid infusion had significantly shorter latency and amplitude of P1 than the group of late lipid infusion. Conclusion Early effective nutrition positively affect feeding tolerance and weight gain and maturation of higher brain centers brain.

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