Static acoustic impedance of the chinchilla middle ear: Awake and sedated

1975 ◽  
Vol 58 (5) ◽  
pp. 1100-1103 ◽  
Author(s):  
Charles M. Woodford ◽  
Donald Henderson ◽  
Roger P. Hamernik ◽  
Alan S. Feldman
Keyword(s):  
Middle Ear ◽  
Acoustic Impedance

An Acoustic Method for Clinical Examination of the Ear

1963 ◽  
Vol 6 (4) ◽  
pp. 303-314 ◽  
Author(s):  
J. Zwislocki
Keyword(s):  
Clinical Examination ◽  
Middle Ear ◽  
Acoustic Impedance ◽  
Acoustic Method ◽  
Suggested Method ◽  
Supplementary Information ◽  
Impedance Measurements ◽  
Acoustic Resistance

An objective acoustic method is suggested for diagnostic examination of the ear. It provides supplementary information to the otoscopic and audiometric examinations. The acoustic method is based on impedance measurements at the eardrum by means of an acoustic bridge that is calibrated in absolute acoustic resistance and compliance units. The obtained values can be read directly on the instrument dials and no time consuming computations are required. The article includes an explanation of the concept of acoustic impedance, an analysis of the middle ear mechanism and of the acoustic effects of middle ear pathologies, in addition to a description of the suggested method.

Effects of Body Position on the Auditory System

1972 ◽  
Vol 15 (2) ◽  
pp. 330-339 ◽  
Author(s):  
J. H. Macrae
Keyword(s):  
Hydrostatic Pressure ◽  
Tympanic Membrane ◽  
Auditory System ◽  
Middle Ear ◽  
Acoustic Impedance ◽  
Body Position ◽  
Upright Position ◽  
Tensor Tympani Muscle ◽  
Muscle Reflexes ◽  
Labyrinthine Fluids

Effects of body position on auditory threshold acuity, the acoustic impedance at the tympanic membrane, and the middle ear muscle reflexes were investigated at 150, 250, and 500 Hz. Relative to the values obtained in the seated upright position, threshold acuity was reduced, the resistive and reactive components of the acoustic impedance were greater, and the effects of stapedius and tensor tympani muscle contractions on the compliance at the tympanic membrane were reduced in the inverted (upside-down) position. The increase in acoustic impedance, which is probably due to an increase in the hydrostatic pressure of the labyrinthine fluids, accounted for only about half the decrease in threshold acuity.

Middle ear acoustic impedance

1989 ◽  
pp. 20-21
Author(s):  
Ramindar S. Dhillon ◽  
James W. Fairley
Keyword(s):  
Middle Ear ◽  
Acoustic Impedance
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