Questions and Best Answers



Diagnosis can be done by these following method.  


          A. Play audiometry:

 The child is conditioned to perform an act such as placing a marble in a box each time he hears a sound signal.


                  Each correct performance of the act is reinforced with praise, encouragement.


                 Ear specific threshold can be determined by standard audiometric technique.


                   Child is asked to repeat the names to certain objects or to point them on pictures.


                                               The voice can be gradually lowered.


                                    Hearing level & speech discrimination can be tested.


          A. Evoked response audiometry:

  • Auditory brain stem response (ABR): It provides an ear specific information as sound stimulus can be presented to each ear separately by headphones or ear inserts.
  • Electrochleography: Measure auditory sensitivity within 20dB.

          B. Otoacoustic emissions (OAE):

  • Transient evoked emissions (TEOAE)- Absent when hearing loss >30dB.
  • Distortion product emission (DPOAE)- Absent when hearing loss >50dB.

          C. Impedance audiometry: Normally stapedius muscle contracts in response to sound of 70-100dB, hearing loss & this reflex can be recorded.

Absence of acoustic reflex indicates- 1. Middle ear disorder. 2. Retro cochlear hearing loss. 3. Severe to profound SNHL.

Absence of reflex but normal tympanometry- SNHL of severe profound degree.

Absence of reflex but abnormal tympanogram- conductive loss.