Principles of Audiology Exam 3 Flashcards
___________ is the opposition to the flow of energy.
Impedance
The ___________ determine(s) stiffness of the middle ear.
Tympanic Membrane
The __________ determine(s) mass of the middle ear.
Ossicles
We present words for word recognition at _________
30 db SL
SL stands for _____________
sensation level
The 30 db SL for a patient with 15 db HL is ____________
45 db HL
SRT stands for _______________
speech reception threshold
It is called _________ when a patient performs worse on word recognition at 85 db HL than 30 db HL
rollover
___________ is the ease with which sound flows through the system
admittance
an ear canal volume of 1.33 cc indicates ___________
no perforation and a normal ear canal size
You expect a ______________ when there is fluid in the middle ear.
Type B tympanogram
When the tympanic membrane is hypermobile, it would be a type _______ tympanogram.
Ad
______________ can cause a type As tympanogram
Otosclerosis
Negative pressure in the middle ear causes a type _______ tympanogram
C
Normative values for adults
0.5 - 2 cc
What measures the mobility of the tympanic membrane, air pressure within the middle ear cavity, and presence of acoustic reflex?
Acoustic Immitance
Impedance consists of:
resistance and reactance
resistance is
the opposition to energy flow - frictional component
reactance is
the opposition to energy flow - storage addition
the middle ear is a _______ dominated system
stiffness
stiffness and mass reactance are ________ related and dependent on frequency.
inversely
In reactance, as frequency _______ the total value of the mass reactance factor also increases
increases
In reactance, as frequency increases, stiffness ____________.
decreases
what is static acoustic compliance/admittance
mobility of the tympanic membrane in response toa given value of air pressure in the external ear canal
What is ear canal volume?
reported by a tympanometer but not shown on the tympanogram graph. For adults, the normal range is typically .5 - 2 cc and for kids, the normal range is .5 - 1.55 cc.
Hypermobility?
If the tympanogram peak is at 0 daPa but is extremely broad and has a very high static admittance, it suggests a very mobile system. Called type Ad tympanogram
Admittance is represented by the letter
Y
Impendence is represented by the letter
Z
acoustic reflex:
examines the presence of retrocochlear and facial nerve pathology by using the reflexive contraction of the stapedius muscle in the middle ear in response to loud sound.
Probe tone of 226 Hz is used for acoustic reflex
true
For a normal acoustic reflex, the pure tone detection threshold must be better than about ______ at that test frequency.
50 db HL
Atypical reflex can include the absence of a reflex and an _______ reflex.
elevated
ipsilateral is
uncrossed
contralateral is
crossed
HINT is a ______ hearing test
binaural
