jae1969 at hotmail.com
Mon Dec 7 10:05:04 EST 1998
>To: audiolog at net.bio.net
>From: Allan0001 at aol.com
>Subject: Contra reflexes
>What is the difference between Contra -reflex testing and Ispilateral
>testing of the ears reflexes?
I am an audiology student at the University of Sout Dakota. Please
forgive me if this sounds like it came from a lecture, because it
probably did! :)
Ipsi: same side. The tone is presented and measured in the same ear.
The pathway is as follows for Right Ipsi: Outer ear, Middle ear, Inner
ear, 8th Auditory Nerve, Cochlear Nucleus, Superior Olivary Complex,
down the Right 7th Facial Nerve.
Left Contra: Tone presented in right ear, measured in left. Pathway is
as follows: Outer ear, Middle ear, Inner ear, Right 8th Auditory Nerve,
Cochlear Nucleus, Superior Olivary Complex, down the Left 7th Facial
Left Ipsi: The tone is presented and measured in the Left ear. The
pathway is as follows for Left Ipsi: Outer ear, Middle ear, Inner ear,
Left 8th Auditory Nerve, Cochlear Nucleus, Superior Olivary Complex,
down the Leftt 7th Facial Nerve.
Right Contra: Tone presented in left ear, measured in right. Pathway
is as follows: Outer ear, Middle ear, Inner ear, Left 8th Auditory
Nerve, Cochlear Nucleus, Superior Olivary Complex, down the Right 7th
The possible results of a relex test:
High Freq HL: Lower freq's are present, Higher freq's absent
Lower Brainstem pathology: Ipsilateral response, but no contralateral
Unilateral facial nerve pathology: (My professor gave the example of a
Right Facial nerve tumor:) Left Ipsi and Right Contra responses, no
Right Ipsi or Left contra response.
Unilateral pathology somewhere in the Ascending Pathway: (Again, my
professor gave the example of a lesion on the right side:) Left Ipsi
and Left Contra respond, Right Ipsi and Right Contra do not.
No Reflexes: Normal reflexes,
signal may not be loud enough,
the degree of hearing loss is very high and the limits
of the machine have been reached,
there is a conductive HL,
or the patient could have MS.
(These examples are not totally inclusive;
there could be other reasons out thre.)
The hearing thresholds as compared to reflex threshold:
85 dB SL: Normal
55 dB SL and below: Recruitment, possible Sensori-Neural HL
100 dB SL and above: Possible retrocochlear pathologies
> Would both be done in a hearing evaluation or should be completed
> by a audiologist if not done?
Yes. If both ipsi and contras are not done, the results would be
To verify that the information I have written is correct, I have
forwarded this post to my audiology professor. I will let you know if I
have given any wrong or incomplete information.
Jae Utke, University of South Dakota, Department of Communication
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