AAO-HNSF Certificate Program for Otolaryngology Personnel

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

1

Immittance Measures • Acoustic immittance refers to an acoustic energy transfer (ie. Sound waves reach the ear canal and sound pressure is applied to the eardrum)

• When enough sound pressure is exerted, the middle and inner ear systems are set into motion

• Since measurements are made at the probe tip and not the eardrum, equipment must subtract out acoustic immittance of ear canal volume in order to infer middle ear function alone

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

2

Admittance vs. Impedance

• Middle ear system does not fully transduce sound energy. Some is transduced or “admitted ”

• Some is reflected back or “impeded”

AAO-HNS/F

Certificate Program for Otolaryngology Personnel Workshop

3