Tympanometry in Normal Neonates 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 monotoni-cally increasing tympanograms were found. Static values for conductance, susceptance, admittance, resistance, reactance and impedance at the ... Research Article
Research Article  |   March 01, 1979
Tympanometry in Normal Neonates
 
Author Affiliations & Notes
  • Mordechai Z. Himelfarb
    UCLA School of Medicine, Los Angeles
  • Gerald R. Popelka
    UCLA School of Medicine, Los Angeles
  • Eliahu Shanon
    Tel-Aviv University School of Medicine
Article Information
Research Articles
Research Article   |   March 01, 1979
Tympanometry in Normal Neonates
Journal of Speech, Language, and Hearing Research, March 1979, Vol. 22, 179-191. doi:10.1044/jshr.2201.179
 
Journal of Speech, Language, and Hearing Research, March 1979, Vol. 22, 179-191. doi:10.1044/jshr.2201.179

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 monotoni-cally 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.

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