Document Detail

Noise-induced threshold shift and cochlear pathology in the Mongolian gerbil.
MedLine Citation:
PMID:  649873     Owner:  NLM     Status:  MEDLINE    
Groups of six mongolian gerbils were exposed to two-octave (1414-5656 Hz) band noise for 1 h at 100, 110, and 120 dB SPL. Threshold shift at several frequencies was measured 0.5, 3, 6, and 12 h, and 1-28 days after exposure. Final thresholds were determined at least two months postexposure. Extensive threshold shift was observed in all groups 0.5 h after exposure (TS0.5h). Where threshold shift increased in the initial hours after exposure, such increases were correlated with eventual permanent threshold shift (PTS). Recovery of thresholds from 1-28 days after exposure was approximately exponential, and slowest at the edges of the exposure band. PTS was seen in the 110 and 120 dB SPL groups. With TS0.5h of 50 dB or less, no PTS resulted. With TS0.5h above 50-60 dB, eventual PTS increased linearly with a slope of about 1.25 PTS/TS0.5h. Cochlear damage was evaluated by light microscopy. The relationship between hair cell loss and PTS was consistent with an inner hair cell threshold about 40 dB higher than that of outer hair cells. It is suggested that recovery from noise-induced threshold shift may involve different mechanisms in the two types of hair cells.
A Ryan; R C Bone
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of the Acoustical Society of America     Volume:  63     ISSN:  0001-4966     ISO Abbreviation:  J. Acoust. Soc. Am.     Publication Date:  1978 Apr 
Date Detail:
Created Date:  1978-07-26     Completed Date:  1978-07-26     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  7503051     Medline TA:  J Acoust Soc Am     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1145-51     Citation Subset:  IM    
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MeSH Terms
Auditory Threshold*
Cochlea / pathology*
Hair Cells, Auditory / pathology
Hearing Loss, Noise-Induced / etiology*,  physiopathology
Time Factors

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