Table of Contents

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THE AUDIOLOGIC TEST BATTERY

• Pure-tone air-conduction testing
• Pure-tone bone-conduction testing
• Speech testing
• Masking

TESTS TO EVALUATE MIDDLE-EAR FUNCTION

The term acoustic immittance is used to refer to either

• acoustic admittance (the ease with which energy flows through a system) or
• acoustic impedance (total opposition to the flow of sound energy).

OBJECTIVE TESTS FOR DIFFERENTIAL DIAGNOSTIC APPLICATIONS

Otoacoustic emissions

It is thought that the active motility of outer hair cells serves as an amplifier of the displacement of the cochlear partition, resulting in various forms of otoacoustic emissions as by-products that are detectable at low intensities.

These acoustic by-products of outer hair cell motility are often referred to as ‘‘cochlear echoes.’’

ELECTROCOCHLEOGRAPHY

The measurement of neuroelectric events generated by cochlear structures and the auditory nerve in response to acoustic stimulation.

One of the main clinical applications of electrocochleography is in the differential diagnosis of hydropic conditions of the cochlea that may be associated with M้ni่re’s disease or other pathologies.

AUDITORY BRAINSTEM RESPONSE

The ABR is a surface-recorded averaged response representing the activity of the distal portion of the auditory pathway.

The ABR reflects the activation of the auditory pathway from the cochlear nerve through the first two or three synapses of the afferent auditory pathway.

It is an ideal tool

• To objectively determine auditory sensitivity
• To diagnose neuropathology along the auditory pathway
• To serve as a reliable intraoperative monitoring tool during surgical procedures that place auditory structures at risk.

Summarized By Thirayost Nimmanon

โดย ธีรยสถ์ นิมมานนท์

ปรับปรุงครั้งล่าสุด 15/06/2010

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