Intro to Audiology Assessments

Test 4 info

What do you look for during otoscopy?

intact canal, tympanic membrane, color, manubrium of malleus and cone of light

How are admittance and impedance related to each other?

Inverse relationship, admittance allows sound through and impedance blocks sound

What makes up probe for tympanometry?

mic, speaker, air pump

What three things are measured with tympanometry?

pressure, volume, admittance

What frequency is the probe tone?

226 Hz

Normal pressure range for tymps?

-150-50 daPa

Normal volume range for tymps?

0.8-2.2 ml

Normal admittance for tymps?

0.3-1.7 ml

What is admittance for type A-s?

< 0.3ml

What is admittance for type A-d?

> 1.7 ml

Type B admittance?

0 or too large volume for perforated type B

What is different for Type C tymp?

Pressure is abnormal at less than -150 daPa

Typical test frequencies for acoustic reflex testing?

500, 1000, 2000

Which test needs to be done before acoustic reflex?

Tymps

Ipsilateral

measuring acoustic reflex on same side as stimulus

Contralateral left

left ear gets stimulus right ear gets measurement

Contralateral right

right ear gets stimulus left ear gets measurement

What do OAEs measure?

function of outer, middle and inner ear through sound emission of hair cells

What is needed for OAEs to count as present?

OAE needs to be at least 6 db more than noise floor

An absent OAE can indicate a problem where?

Outer, middle and inner ear

What three electrodes are needed to measure ABRs?

Grounding, inverting and non inverting

What is ABR assessing?

Auditory nerve and brain stem