audio03 audiometry
TRANSCRIPT
• Basic Principles of Sound
• The Audiometer
• Test Environment
• Patient’s Role
• Clinician’s Role
• Air Conduction Audiometry
• Bone Conduction Audiometry
• Audiogram Interpretation
• Masking
Pure Tone Audiometry
• Sound Waves and Propagation of Sound
• Frequency (Hz)
• Resonance
• Intensity (The Decibel or dB)
Basics of Sound
• Hand Raising
• Signal Button
• Verbal Response
• False Positives and False Negatives
Patient’s Role
• Instructions
• Patient’s Position
• Placement of Earphones
• Test Procedures for Screening
• Test Procedures for Pure Tone Thresholds
Clinician’s Role
• Instructions• What are they listening for
• How to respond
• Verify they understand instructions
Clinician’s Role
• Screening Test Procedures (adults)• Instructions
• Test Frequencies
• Disposition of Failures
Clinician’s Role
• Pure Tone Threshold Procedures• Self-test
• Place earphones on patient
• Test better ear first
• Order of test frequencies
• Test other ear
• Use ASHA protocol for threshold testing.
Clinician’s Role
• Degree of Hearing Loss based on PTA• None
• Slight
• Mild
• Moderate
• Moderately Severe
• Severe
• Profound
Clinician’s Role
• Cross Hearing and Interaural Attenutation
• Masking Defined
• Rules
• Types of Masking Noise
Masking
• Cross Hearing
• Interaural Attenuation• Definition
• Variables
• transducers
• frequency
• individual variability
Masking
• Rule• Apply masking to NTE whenever the AC of the TE
exceeds the BC for the NT cochlea by the amount of the minimum IA values.
• Minimum IA values• Supraaural phones = 40 dB
• Insert phones = 70 dB
• Bone conduction = 0 dB
Masking