On 15 Feb 1996, Tom Boismier wrote:
> 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.
>>>Thanks so much for your help. I appreciate it.
Cal State Northridge