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IHS textbook chapter 8 Questions and Answers 2024
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IHS textbook chapter 8
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IHS textbook chapter 8what test is to measure middle ear function and asses the integrity of the middle ear
muscle reflex - answer immittance audiometry
this test assess middle ear function - answer tympanometry
the MEMR (middle ear muscle reflex) pathway is assessed with - answer threshold and
decay measurements
immittance is an objective test which means what - answerthe patient is not required to
participate
the flow of acoustic energy through the ME system is represented by - answer
immittance
what is impedance - answer the opposition of energy flow through the ME system
the ease at which acoustic energy passes through the ME system is also known as
what - answer admittance
the TM, ossicular chain and air filled middle space make up what - answer middle ear
(ME) system
low impedance/high admittance describes what kind of ME system - answer normal
this is a general term that indicates acoustic impedance/admittance. It represents the
measurement of ME and MEMR functions – answer Otoimmittance
the ease with which energy flows through the ME system, the reciprocal of impedance -
answer acoustic admittance
the resistance of energy flow through the ME system, the reciprocal of admittance -
answeracoustic impedance
these two words are terms for admittance - answermobility and compliance
these two terms are used for immittance - answerstiffness and non compliance
the measurement of the ME function in terms of compliance/stiffness as a function of
the external ear canal pressure - answertympanometry
, the acoustic reflex, also known as the stapedial reflex, the involuntary contraction of the
stapedious muscle to an intense sound - answermiddle ear muscle reflex (MEMR)
the lowest intensity of a pure tone that causes the stapedious muscle to contract -
answerMEMR threshold
the measurement of the stapedious muscle's ability to maintain a contraction to a pure
tone - answerMEMR decay
the multi-purpose immittance assembly inserted in the ear canal, it uses disposable tips
and provides an air tight seal when inserted properly - answerprobe assembly and
probe tip
usually 220 or 226 HZ is used to test adults. the probe tone is delivered into the ear
canal at 85 dB SPL - answerprobe tone
the abbreviation of a physical unit of pressure called the decaPascal.
One daPa equals 10 pascals - answerdaPa
this is an abbreviation of a physical unit of pressure called millimeters of water, used in
tympanometry - answermm H2O
ml and cc or cm3 - answermililiters ML, cubic centimeters CC or cm3
a component in the immittance audiometer that measures external ear canal pressure -
answermanometer
this tool performs tympanometry and MEMR testing - answerimmittance audiometer
tis part of the immittance audiometer has four ports that lead to, the air pump, a tiny
speaker for the probe tone , a tiny microphone for the pure tonesfor MEMR testing, and
the microphone that measures the sound pressure level - answerthe probe assembly
the measurement of middle ear impedance as a function of external ear canal pressure
is called what - answertympanometry
acoustic energy is more easily moved through the TM to the Ossicular chain to the
perilymph of the cochlea when? - answerwhen the pressure in the external ear canal
and the middle air space is equal
any pressure differential and the TM will stiffen and cause what to happen - answerit will
reflect acoustic energy back into the canal
what is the guiding principle in tympanometry - answerthe mechanical function of the
middle ear system is optimal when the pressure on both sides of the TM is equal
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