Abstract 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 References 1. Jepsen, O.: Middle-Ear Muscle Reflexes in Man , in Jerger, J. (ed.): Modern Developments in Audiology , New York: Academic Press, Inc., 1963. 2. Metz, O.: The Acoustic Impedance Measured on Normal and Pathological Ears , Acta Otolaryng , (supp 63) , p 254, 1946. 3. Klockhoff, I.: Middle Ear Reflexes in Man: A Clinical and Experimental Study With Special Reference to Diagnostic Problems in Hearing Impairment , Acta Otolaryng , (supp 164) , pp 1-91, 1961. 4. Ewertsen, H.W., et al: Comparative Recruitment Testing , Acta Otolaryng , (supp 140) , pp 116-122, 1958. 5. Thomsen, K.A.: The Metz Recruitment Test , Acta Otolaryng 45:544-552 ( (Jan) -Dec) 1955.Crossref 6. Lamb, L.E., and Peterson, J.L.: Middle Ear Reflex Measurements in Pseudochypacusis: A Report of Two Cases , J Speech Hearing Dis 32:46-51 ( (Feb) ) 1967. 7. Terkildsen, K., and Nielsen, S.S.: An Electroacoustic Impedance Measuring Bridge for Clinical Use , Arch Otolaryng 69:339-346 ( (Sept) ) 1960.Crossref 8. Hardy, W., and Pauls, M.D.: Significance of Problems of Conditioning in GSR Audiometry , J Speech Hearing Dis 24:123-126 ( (May) ) 1959. 9. Eagles, E.L., et al: Hearing Sensitivity and Related Factors in Children , Pittsburg: University of Pittsburg Graduate School of Public Health, 1963. 10. Schlosser, W.D.: A Clinical Investigation of the Surgical Treatment of Congenital Mixed Deafness , Laryngoscope 74:1-21 ( (Jan) ) 1964.Crossref
Archives of Otolaryngology – American Medical Association
Published: Aug 1, 1968
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