Welch Allyn TM286 Auto Tymp - User Manual - Manual (Page 12)

8 Introduction Welch Allyn TM286 Auto Tymp
Glossary of terms
Acoustic Reflex Reflexive contraction of the stapedius muscle in response to
loud sound.
Automated
Audiometry (Auto
HL) Automated measurement of hearing that allows the listener to
control the intensity with a hand switch.
Compliance Peak The point of maximum mobility in a tympanogram, which
indicates the degree of mobility within the middle-ear system.
Ear Canal Volume Volume measured between the tip of the probe and the
tympanic membrane at the starting pressure for a tympanogram
using a 226 Hz probe tone.
Ipsilateral Acoustic
Reflex The acoustic reflex elicited when the stimulus is presented to
the same ear where the response is measured.
Normal Box Range of pressure peak and compliance peak values associated
with normal middle-ear function. (-150 daPa to +100 daPa, 0.2
cm
3
to 1.4 cm
3
per ASHA, 32, Supl. 2, 1990, 17-24) - only
available on 226 Hz probe tone testing.
Pressure Peak Pressure value where maximum mobility occurs in a
tympanogram. This pressure value approximates the pressure
within the middle-ear space.
Probe Tone The pure tone that is held at a constant intensity level in the ear
canal - assists in the measurement of middle ear function.
Screening
Audiometry Rapid assessment of the ability of individuals to hear acoustic
signals across a frequency range at a fixed criterion intensity
level; designed to identify those who require additional
audiometric procedures.
Tympanogram Graph of the middle ear immittance as a function of the amount
of air pressure delivered to the ear canal.
Tympanometry Procedure used in the assessment of middle ear function in
which the immittance of the tympanic membrane and middle
ear is measured as air pressure delivered to the ear canal is
varied.