Copy of Audiology Guide for Physicians

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Audiology Tests for referring physicians

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Audiology Guide :

Audiology Guide Basics of Audiometric Interpretation for Referring Physicians & Other Practitioners Developed by: Alan M. Richards, Ph.D , Copyright 2012 .

The Role Of Audiologists:

The Role Of Audiologists Diagnostics Concerning Hearing & Balance Disorders Rehabilitation of Hearing Using Hearing Instruments, Assistive Listening Devices, Tinnitus, Auditory Processing, & Cochlear Implants. Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Basic Audiometry Outline :

Basic Audiometry Outline The Audiogram Audiometric Symbols Audiometric Findings in Varying Types of Hearing Loss. Degrees of Hearing Loss Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Ear Testing Basics-1:

Ear Testing Basics-1 Stapes Pinna Ear Canal Ear Drum Outer Middle Inner Air Conduction- Tests All Three parts of the Ear Simultaneously Bone Conduction- Tests the Inner Ear only Developed by: Alan M. Richards, Ph.D , Copyright 2012.

The Sensorineural & Conductive Mechanisms:

The Sensorineural & Conductive Mechanisms Conductive Mechanism: The Outer & Middle Ears Sensorineural Mechanism: The Inner Ear & Eighth Nerve Conductive Sensorineural Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Ear Testing Basics-2:

Ear Testing Basics-2 Diagnosis Normal Hearing Conductive Loss Sensorineural Loss Mixed Loss Air- Conduction Testing Normal Abnormal Abnormal Abnormal Bone- Conduction Testing Normal Normal Abnormal Abnormal Notes AC=BC, both are WNL AC worse that BC. BC is WNL AC=BC. Both are abnormal AC worse than BC. BC is not normal Developed by: Alan M. Richards, Ph.D , Copyright 2012.

The Audiogram:

The Audiogram dB HTL Scale Frequency Scale

Audiometric Symbols:

Audiometric Symbols Right Ear Left Ear

Degrees of Hearing Loss:

Degrees of Hearing Loss Profound Loss Moderately-Severe Loss Mild Loss of Hearing Severe Loss Borderline Normal dB HTL

Audiometric Results :

Audiometric Results Hearing Within Normal Limits Air- & Bone Conduction are Equal & Fall WNL

Audiometric Results Conductive Loss:

Audiometric Results Conductive Loss Note the Difference Between Air- and Bone-Conducted Sounds on the Left Side (Air-Bone Gap) Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Audiometric Results Sensorineural Loss:

Audiometric Results Sensorineural Loss Note That Both Air & Bone Conduction Sounds are Reduced & Equal to Each Other Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Audiometric Results Mixed Loss:

Audiometric Results Mixed Loss Note for the Left Ear that Both the Air- & Bone Results are Reduced, but Not Equally. Two-Plot Audiogram

Tympanometry Basics:

Tympanometry Basics Air Pressure in Sealed Ear Canal in daPa Eardrum Mobility Measured in milliliters (ml) Air Pressure Within a Sealed Ear Canal Measured in daPa (0 daPa=Normal Barometric Pressure)

The Normal Tympanogram (Type A):

The Normal Tympanogram (Type A) Air Pressure in Sealed Ear Canal in daPa Note Peak Compliance at (or near) 0 daPa

Tympanogram Type C:

Tympanogram Type C Note Maximum Eardrum Compliance at –225 daPa Air Pressure in Sealed Ear Canal in daPa Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Tympanogram Type B:

Tympanogram Type B Note That There is No Absolute Point of Maximum Compliance Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Tympanogram Type As:

Tympanogram Type As Note That Peak Compliance is at (or near) 0 daPa, but That Compliance Value is Low Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Tympanogram Type Ad:

Tympanogram Type Ad Note That Peak is at (or Near) 0 daPa, but That Compliance is Greater Than Normal Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Speech Audiometry Basics:

Speech Audiometry Basics Speech Reception Threshold (SRT) Lowest Speech Which is Understood. 0 dB HTL Represents the Average Level that Listeners Can Understand Speech. SRT Agrees very well with the 500-2000 Hz Thresholds for Pure Tones. Speech Discrimination Score (SDS) The score (0-100%) of Words That Are Heard Correctly at a Level Which is Well Above Threshold (Usually 35-40 dB Above SRT). Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Speech Sounds & Hearing:

Speech Sounds & Hearing Frequency in Hertz (Hz) 125 250 500 1000 2000 4000 8000 dB HTL Speech Sounds Superimposed on an Audiogram Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Speech Sounds & Audiometric Findings:

Speech Sounds & Audiometric Findings Frequency in Hertz (Hz) 125 250 500 1000 2000 4000 8000 dB HTL Sounds Not Heard Well Sounds Heard Well Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Advanced Audiology Some Other Procedures:

Advanced Audiology Some Other Procedures Otoacoustic Emissions (OAEs) Brainstem Audiometry (BAER) Videonystagmography (VNG) Electrocochleoghraphy (ECochG) Posturography Developed by: Alan M. Richards, Ph.D , Copyright 2012.

Final Comments:

Final Comments Developed by: Alan M. Richards, Ph.D , Copyright 2012. The author may be reached at dr.a.richards@gmail.com