AAO-HNSF Certificate Program for Otolaryngology Personnel

Occlusion Effect (Continued)

• Does NOT occur when unmasked bone is tested • Occurs at 250, 500, 1kHz • Must add to initial masking levels in order to eliminate the effect

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

34

Occlusion Effect (Continued)

Frequency (Hz)

250

500

1000

2000+

Intensity (dB)

30

20

10

0

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

35

Masking Dilemma • Occurs when the initial masking level causes over-masking • Occurs with bilateral conductive hearing loss • It may not be possible to obtain a masked threshold • Refer case to audiologist

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

36