VEMP* in Conductive Hearing Loss
Med. J. Cairo Univ., Vol. 78, No. 1, December: 539-541, 2010
Vestibular Evoked Myogenic Potentials (VEMP) in Conductive Hearing Loss
MOUSTAFA M. EL-KHOUSHT, M.D.; NOHA A. HOSSNI, M.D.; SHERENE M. EL-ABD, M.D. and AMIRA M. EL-SHENAWY, M.D.
Audiology Unit, E.N.T. Department, Faculty of Medicine, Cairo University
Conductive hearing loss is one of the most common diseases and may result from many causes in the external canal, in the tympanic membrane and in the middle ear. Air conducted (AC) stimulating sounds, transmitted through the middle ear conduction system fail to elicit VEMP in those with conductive hearing loss because an intact middle ear transmission system is needed.
Bone conduction tone burst stimulation can evoke VEMP using frequencies around 500 Hertz (Hz). Clinical bone vibration generally requires additional amplification to produce strong enough stimuli for VEMP testing.
Using the Vivosonic Integrity™ V500 System, the aim of this study was to investigate the VEMP* responses in conductive hearing loss using bone conduction stimulation. The response percentage of present VEMP waves by AC stimulation was 20% (4 ears). For BC stimulation, the rate increased to 75% (15 ears).
- VEMP can be used to test for the presence of conductive hearing loss in difficult to test patients.
- BC stimulation can be used to evoke VEMP waves with a high degree of accuracy when conductive hearing loss is present.
- All cases with absent VEMP waves for AC stimulation should have a trial to elicit VEMP waves by BC stimulation.
*VEMP testing is currently an off-label use of the Integrity™ V500 System
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