thank you guest1 for q&a wit expl. - okt3

[ArchivalUser]

A comatose patient is being evaluated by caloric stimulation
of the vestibular apparatus. Cold-water irrigation of the right
external auditory canal leads to deviation of both eyes to the
right for 2 min, followed by a slow drift back to the midline.
This finding is most consistent with a lesion in the

A) right labyrinth

B) midbrain

C) medulla

D) pons

E) cerebral hemispheres

[ArchivalUser]

VESTIBULO-OCULAR REFLEX FOR BRAIN STEM INTEGRITY; ==== COWS === COLD OPPOSITE SIDE AND WARM SAME SIDE.

HERE ANS: D?

[ArchivalUser]

your welcome okt3...

ans: B?

[ArchivalUser]

ee. the test shows intact brain stem so cause has to be cerebral hemisphere

[ArchivalUser]

drdrvnvn, agree with COWS === COLD OPPOSITE SIDE AND WARM SAME SIDE but read again if you can go further, I mean D is not the given answer

[ArchivalUser]

EEEE,bilateral hemisphere lesions,isnt it?

[ArchivalUser]

The answer is E.

Bilateral conjugate eye movement to the side of the caloric stimulation indicates integrity of

the brainstem pathways from the medulla to the midbrain (where the third nerve originates),

as do full conjugate oculocephalic motions (doll™s-eye maneuvers). The absence of the rapid

corrective phase manifested by nystagmus-like leftward gazing indicates a bilateral

hemispheric lesion. Failure of an eye to adduct properly in the initial phase of the caloric

response indicates a lesion in the ipsilateral third nerve (midbrain) or in the medial

longitudinal fasciculus producing internuclear ophthalmoplegia. In the former case, the pupil

would be dilated and the eye would be abducted at rest.

[ArchivalUser]

I JUST CAN'T GET IT.......CAN YOU PL EXPLAIN IT.....I WUD BE GRATEFUL TO YOU.....THE NORMAL TEST ALSO.....AND INFERENCE OF IT.....PLZZZ OKT3...