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Author: admin | 04.06.2014 | Category: Tinnitus Causes And Treatments

Frequency: The sound frequency or pitch (measured in Hertz) is plotted on the X (horizontal) axis.
Intensity: The sound Intensity or loudness (measured in decibels) is plotted on the Y (vertical) axis.
The softest sound a person hears 50% of the times, at each frequency is his Hearing Threshold at that frequency. The difference between the air conduction thresholds of the right and left ear is more than 40db.
By comparing the air conduction and bone conduction thresholds, we can determine if the hearing loss is conductive, sensorineural or mixed. The audiogram shows normal bone conduction thresholds while the air conduction thresholds show a hearing loss greater than 20db (remember 0- 20 db is normal range).


Examples: Wax, glue ear, otitis media, perforation of the tympanic membrane, or ossicular abnormalities.
Both the air and bone conduction thresholds are above 20db but the difference between the air and bone conduction threshold is more than 10db. Fig 6: Mixed hearing loss with a conductive loss of 50db at 250hz and 1K, 45 at 500hz and 2k, 65db at 4k and 75db at 8k. Type B: Is a flat, horizontal trace, indicating fluid in the middle ear (in the presence of normal ear canal Volume). The authors of this document have attempted to provide information that is medically sound and up-to-date. It is the softest sound that a person with normal hearing would be able to hear at least 50% of the times.


It is done to prevent nontest ear from detecting the sound presented to the test ear by crossover. The compliance (inverse of stiffness) of the tympano-ossicular system is charted against various pressure changes.



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