Transcript HUMAN EAR & SIMPLE TESTS OF HEARING

HUMAN EAR & SIMPLE
TESTS OF HEARING
Anatomy
Types of Hearing Loss
Conductive - Outer or Middle ear Lesion
Sensorineural - Inner or Pathway Lesion
Mixed - Simultaneous Conductive & Sensorineural
Loss
Pathways for Sound
Tuning Fork Tests
Purpose
Types of Tests
Schwabach
Weber
Rinne
Bing
Tuning Fork Tests
Schwabach
Procedure
Assumption is that examiner has
normal hearing
1. Examiner places TF on patient’s
mastoid
2. Patient lets examiner know when
they no longer hear tone.
3. Examiner places TF on their own
mastoid
Schwabach
Interpertation
If examiner hears longer you have a diminished
schwabach which is consistent with a sensorineural loss.
If patient hears tone longer you have a prolonged
schwabach consistent with a conductive loss.
Weber
Procedure
TF is placed on midline (forehead or
vertex) of head.
Patient is to indicate where they
hear the TF the loudest.
Interpretation
If in the good ear = sensorineural
If in the poor ear = conductive
Rinne
Procedure
TF is alternately placed on mastoid and about 1 to 2
inches from pinna.
Interpretation
If heard better on mastoid = negative rinne = conductive
loss.
If heard better through air = positive rinne =
sensorineural loss.
Procedures
Bing
TF is placed on mastoid.
Finger is used to alternately open and close the
ear canal
Interpretation
If placing finger in ear canal makes sound
louder = positive bing = sensorineural loss.
If patient doesn’t notice a difference =
negative bing = conductive loss
Summary of
Tuning Fork Tests
Test
Conductive
Sensorineural
Schwabach
Prolonged
Diminished
Rinne
-
+
Bing
-
+
Weber
Lateralize to
BAD ear
Lateralize to
GOOD ear
Summary