Behavin' Badly
What behavioral test diagnoses hearing loss?
Bone Conduction
AC and BC thresholds at 20 dB HL or better.
Normal peripheral hearing sensitivity
What is an acoustic or stapedial reflex?
Contraction of the stapedius muscle in response to intense sound, causing the TM and ossicular chain to stiffen.
Type A
First "test" you perform
Otoscopy
What is the method for pure tone testing?
Bracketing
ABG less than 15 dB HL
SNHL
ARTs are measured in what 4 conditions?
What are the 3 measures of tympanometry?
Static compliance, ear pressure, ear canal volume
The amount of energy lost as sound travels from one side of the head to the other
What does air conduction tell us?
The degree/severity of hearing loss
what would a conductive hearing loss look like on an audiogram?
AC below 20 dB HL, BC thresholds within normal, ABG 15 or greater
Normal reflexes are at typically at ___ dB HL.
80-90 dB HL
Outer ear and middle ear
What is masking?
Keeping the better ear busy when testing the poorer ear
What speech test gives us insight into a patient's functional listening ability?
WRS
AC and BC below 20 dB HL with an ABG greater than 15 dB HL
mixed hearing loss
The ipsilateral acoustic reflex pathway.
ME -> IE -> CN VIII -> CN -> SOC -> CN VII - ME
What are the 3 primary components of a tympanometer?
Probe tone speaker, monitor microphone, pressure pump
OAEs can miss what degree of hearing loss?
Mild hearing loss
What 2 parts of the hearing test do we use to assess a patient's reliability?
PTA and SRT
What does an ABG tell us?
The conductive component of the hearing loss.
The afferent and efferent pathway
Afferent - ME -> IE -> CN VIII -> CN
Efferent - SOC -> - CN VII -> ME
A perforated TM would have what type of tymp?
No peak, no ear pressure, large ECV
What are OAEs measuring?
Outer hair cell function in the cochlea