otometrics Madsen Xeta, Reference Manual

Page: 70 / 108

7.4 Bone Conduction threshold test (manual)
Note
• In Bone Conduction testing, masking is always necessary in order to determine in which ear the presented tone
signal is actually heard. This is because of the reduced level of inter-aural attenuation.
Note
•
Make sure that there are no interfering ambient sounds, particularly at low frequencies. If necessary, place the
patient in a sound booth.
Prerequisites
• Press
Bone
.
• If required, select another stimulus type: Warble or Pulsed .
• Press the
Reverse
button to set the stimulus signal to continuous presentation (use ful for pla-
cing the bone conductor correctly on the patient).
• Set the dB level to a level that will be heard clearly by the patient.
• Place the bone conductor on the patient. See Preparing for bone conduction testing
►
48 .
• Find the best position for the bone conductor. Ask the patient to report when the tone seems
the loudest.
• Make sure that the bone conductor stays securely in place with no contact to the pinna.
• Give the Patient Response switch to the patient and explain how it should be operated (see
The patient responder ► 47 ).
• Press
Reverse
to deactivate the
Reverse
function.
• If you want to use a predefined duration of the signal presentation when you press the
Present Signal button, press Timed .
• If masking is required, see Testing with masking ► 72 .
• If required, turn the
Frequency
knob to set the starting frequency: Typical starting frequency:
1000 Hz.
The signal is usually presented for each tone in the following order:
1000 Hz and increasing frequencies,
followed by frequencies below 1000 Hz in descending order.
The typical test frequencies are:
250 Hz to 4000 Hz.
70 Otometrics - MADSEN Xeta
7 Testing a patient with MADSEN Xeta