Abstract The Zwislocki Acoustic Bridge (mechanical) and the Madsen Z070 Electroacoustic Bridge were compared in 11 normal hearing subjects. Both compliance and absolute impedance values at the eardrum derived with each instrument were correlated with each other and themselves on measurements repeated at three weekly intervals. Test-retest reliability is shown to be extremely high for each instrument and the correlation between instruments is similarly high. It is stressed, however, that these findings relate only to a normal population where the resistance component of impedance is a relatively stable factor that contributes minimally to total impedance measured at the eardrum. References 1. Zwislocki J: Acoustic measurement of the middle ear function . Ann Otol 70:599-607, 1961. 2. Metz O: The acoustic impedance measured on normal and pathological ears . Acta Otolaryng 63-( (suppl) ):1-254, 1946. 3. Terkildsen K, Nielsen SS: An electroacoustic impedance measuring bridge for clinical use . Arch Otolaryng 72:339-346, 1960.Crossref 4. Feldman AS: Acoustic impedance studies of the normal ear . J Speech Hearing Res 10:165-176, 1967. 5. Madsen Model Z070 Electro-Acoustic Impedance Bridge Copenhagen, Madsen Electronics. 6. Djupesland G: Middle ear muscle reflexes elicited by acoustic and nonacoustic stimulation . Acta Otolaryng , (supp 188) , pp 287-292, 1964. 7. Burke KS, Herer GR, McPherson DL: Middle ear impedance measurement . Acta Otolaryng 70:29-34, 1970.Crossref
Archives of Otolaryngology – American Medical Association
Published: Apr 1, 1971
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