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August 1968

Relative Impedance Measurements in Young Children

Author Affiliations

New Orleans; Albuquerque, NM
From the Louisiana State University Medical School, New Orleans (Miss Robertson and Dr. Peterson) and University of New Mexico, Albuquerque (Dr. Lamb).

Arch Otolaryngol. 1968;88(2):162-168. doi:10.1001/archotol.1968.00770010164009

RELATIVE impedance measurements in adults have shown that contractions of the stapedius muscles result in changes in middle ear impedance and that the contractions occur as bilateral reflexes to relatively intense acoustic stimulation (70 to 90 db sensation level).1,2 Jepsen,1 testing both ears of 91 normal subjects, detected stapedius reflex contractions in all but one of the ears tested. Clinical application has shown that this technique can be used in differentially diagnosing conductive hearing losses,3 sensorineural losses with recruitment,1,2,4,5 and, in certain instances, pseudohypacusis.1,2,6 At present, a lack of information regarding relative impedance measurements in children limits the effective clinical use of this technique with this population. We have been able to locate reports of only two studies in which children participated, the ages reported being seven7 and 10 years.1

This study was undertaken to obtain information regarding the use of relative impedance

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