scholarly journals Electrophysiological Threshold Evaluation in Infants with and Without Risk Indicators for Hearing Loss

2020 ◽  
pp. 1-4
Author(s):  
Georgea Espindola ◽  
Daniela Polo Camargo Silva ◽  
Georgea Espindola
Keyword(s):  
Hearing Loss ◽  
Public Hospital ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Risk Indicators ◽  
Moderate Degree ◽  
Brainstem Auditory Evoked Potential ◽  
The Right ◽  
Development Objective

Introduction: The brainstem auditory evoked potential is used to determine the electrophysiological threshold and assessing the integrity of the auditory system. This test is sensitive to the auditory nerve maturation and brainstem; therefore, the electrophysiological threshold may change throughout child development. Objective: to evaluate the changes in the electrophysilogical threshold of brainstem auditory evoked potential in two months of follow-up. Methods: A single non-concurrent cohort study was performed in a public hospital during January 2013 to January 2015. The brainstem auditory evoked potential was performed in all neonates in two moments with electrophysiological thresholds measured in the both ears, whose results were categorized into degree: mild, moderate, severe and profound. Results: Forty-three infants of both genders, 11 with prematurity and 14 with risk indicators for hearing loss participated in the study. In the first brainstem auditory evoked potential, with an average age of two months, 34 infants had abnormal results in the right ear and 31 in the left ear. In the second brainstem auditory evoked potential, with na average age of four months, normalization was observed in 38% of the results obtained in the right ear and in 42% on the left ear. This significant change in brainstem auditory evoked potential thresholds was found in those with mild and moderate degrees. Conclusion: There were changes in the electrophysiological brainstem auditory evoked potential thresholds in infants with a mild and moderate degree, while those with a severe and profound degree the results were permanet at two months of follow-up.

Role of brainstem auditory evoked potential in Forensic Medicine

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Dr A Thind ◽  
Dr. R Singh ◽  
Dr K D Singh ◽  
Dr A Kumar ◽  
Dr. A S Thind
Keyword(s):  
Hearing Loss ◽  
Forensic Medicine ◽  
Evoked Potential ◽  
Auditory Evoked Potential ◽  
Brainstem Auditory Evoked Potential ◽  
Voluntary Response ◽  
Significant Difference ◽  
Sensory Neural ◽  
The Waves

<p>Brainstem Auditory Evoked Potential (BAEP) is an<br />important test used in clinical practice. It is used to<br />diagnose auditory threshold changes and to<br />characterize the type of hearing loss as it does not<br />depends on voluntary response from the subject. Its<br />role in forensic medicine becomes relevant for the<br />assessment of type of hearing loss in medicolegal cases<br />for conductive or sensory neural. It can be used for<br />assessing nature of injuring cases of malingering and<br />pinpointing the neuronal pathway, hhearing loss and<br />whether the victim had hearing loss before the injury or<br />after the injury. This study presents latencies of wave I,<br />II, III, IV and V, interpeak latencies of wave I‐III, I‐V, III‐V<br />and amplitudes of waves I‐Ia, V‐Va and absolute<br />amplitude R in 100 healthy normal hearing in medical<br />students of same age group comprising of 50 females<br />and 50 male for comparison of inter gender difference<br />and for the purpose of establishing normal values. In<br />the present study, it has been concluded that there is<br />highly significant difference in the waves and interpeak<br />latencies III, V and I‐V between females and males. It<br />was also found that the duration of wave I showed<br />statistically highly significant differences and V‐Va<br />showed significant difference between left and right ear<br />in females. It was also found that the duration of wave<br />showed statistically highly significant difference in<br />males.</p>

Hearing Screening of High-Risk Newborns with Brainstem Auditory Evoked Potentials: A Follow-up Study

PEDIATRICS ◽  
1984 ◽  
Vol 73 (1) ◽  
pp. 22-26 ◽  
Author(s):  
Dorothy A. Shannon ◽  
Jacob K. Felix ◽  
Allan Krumholz ◽  
Phillip J. Goldstein ◽  
Kenneth C. Harris
Keyword(s):  
Hearing Loss ◽  
High Risk ◽  
Predictive Value ◽  
Screening Test ◽  
Normal Hearing ◽  
Hearing Screening ◽  
Auditory Evoked Potential ◽  
Hearing Level ◽  
Lost To Follow Up

Numerous techniques have been used in attempts to find a reliable and efficient screening method for determining auditory function in the newborn. The brainstem auditory evoked potential (BAEP) is the latest method advocated for that purpose. The BAEP was evaluated as a hearing screening test in 168 high-risk newborns between 35 and 45 weeks of conceptual age. Follow-up data were obtained after 1 year (mean 17.3 months) on 134 of the infants (80%). Normal hearing was defined as a reproducible response in both ears to a 25 dB normal hearing level (nHL) click stimulus; 21 infants (12.5%) failed the initial screening test. Follow-up on 19/21 infants revealed 18 infants with normal hearing and one infant with an 80 dB nHL bilateral hearing loss substantiated. One infant with an abnormal screening test died before retesting, and the other infant was lost to follow-up but had only a unilaterally abnormal BAEP. None of the infants with a normal BAEP screening study had evidence of hearing loss on retesting. Sensitivity of the BAEP was 100%, specificity was 86%, predictive value of a positive test was 5.26%, and the predictive value of a negative test was 100%. The incidence of significant hearing loss in our population was between 0.75% (1/134 infants) confirmed, and 2.24% (3/134 infants) including infants who failed screening but were lost to follow-up. The BAEP is a sensitive procedure for the early identification of hearing-impaired newborns. However, the yield of significant hearing abnormalities was less than predicted in other studies using BAEP for newborn hearing screening.

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