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Positional Tests and ENG

Tom Boismier boismier at umich.edu
Thu Feb 15 07:13:59 EST 1996

In article <Pine.HPP.3.91.960213181143.1321A-100000 at huey.csun.edu>, 
hbcsc202 at DEWEY.CSUN.EDU says...
>Hello.  I am a graduate student in audiology and I am doing some research 
>about positional tests during the ENG battery.  I would like to have 
>information about the normal and abnormal findings during these tests and 
>any articles or research that subtantiates these findings.  
>Thanks in advance.
>Evelyn Sowles
>Cal State Northridge

Check the classic text, Barber + Stockwell's "Manual of Electronystagmograhy".
Look at Stockwell's "ENG Workbook" for sample tracings. Do a Medline search 
for electronystagmography and positional. Find the newer literature (David Zee 
and others) that detail the thought preocesses behind using positional 
nystagmus as an indicator of peripheral vestibular involvement IF computerized 
oculomotility tests are within age-matched normal limits. 

The classic literature states that positional nystagmus is a non-localizing 
finding, indicating either peripheral vestibular or central vestibulo-ocular 
pathway involvement. Newer studies using computerized ENG with age-matched 
norms for pursuit and random saccade tests suggest that when the oculomotility 
tests are carefully performed and analyzed as normal for age, central 
vestibulo-ocular pathways can be ruled out. Any positional nystagmus other 
than what is considered to be within normal variation (see Barber + 
Stockwell), would then suggest peripheral localization.

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