Audiometry

Question 1

purpose of audiometry

Answer 1

quantify loss and determine its nature

Question 2

types of audiometry

Answer 2

• pure tone audiometry (PTA)
• Tympanometry
• evoked response audiometry

Question 3

features of pure tone audiometry

Answer 3

• Headphones deliver tones at different frequencies and strengths in a sound-proofed room.
• Pt. indicates when sound appears and disappears.
• Mastoid vibrator → bone conduction threshold.
• Threshold at different frequencies are plotted to give an audiogram.

Question 4

features of tympanometry

Answer 4

• Measures stiffness of ear drum (Evaluates middle ear function)
• Flat tympanogram: mid ear fluid or perforation
• Shifted tympanogram: +/- mid ear pressure

Question 5

evoked response audiometry

Answer 5

• Auditory stimulus with measurement of elicited brain response by surface electrode.
• Used for neonatal screening (if otoacoustic emission testing negative)