Document Detail

Tympanometry in normal neonates.
MedLine Citation:
PMID:  502496     Owner:  NLM     Status:  MEDLINE    
Acoustic conductance and susceptance tympanograms were obtained at 220 and 660 Hz in 34 neonates. The neonates were categorized into three age groups (8-24 hours, 24-60 hours, and 60-96 hours). Single-peaked, double-peaked, and monotonically increasing tympanograms were found. Static values for conductance, susceptance, admittance, resistance, reactance and impedance at the lateral surface of the tympanic membrane were computed from the tympanograms. There were no significant differences in mean static values among the three groups. At 220 Hz, the individual static reactance values were usually smaller than the static resistance values and often assumed a positive sign. At 660 Hz, the individual static reactance values always assumed a negative sign and were approximately equal to the static resistance values. The single- and double-peaked tympanograms apparently were the result of previously identified interactions between static resistance and reactance values. The data were compared to those of infants and adults. Tympanograms at 220 Hz were obtained for 13 of the original subjects at the age of three to four months. The data collected in this group were consistent with those reported in the literature for the same age group.
M Z Himelfarb; G R Popelka; E Shanon
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of speech and hearing research     Volume:  22     ISSN:  0022-4685     ISO Abbreviation:  J Speech Hear Res     Publication Date:  1979 Mar 
Date Detail:
Created Date:  1980-01-24     Completed Date:  1980-01-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0376336     Medline TA:  J Speech Hear Res     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  179-91     Citation Subset:  IM    
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MeSH Terms
Acoustic Impedance Tests* / methods
Age Factors
Ear, Middle / physiology
Infant, Newborn*
Reference Values

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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