rida
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If a patient is comatose, and you are doing the caloric test to check vestibular function, and the lesion is on the Right, where would nystagmus's fast component be seen with cold and warm water??
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| rida
Forum Guru
Topics: 109
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The pneumonic is COWS.
If a patient has a lesion in the right vestibular nucleus, and he is comatose, upon putting COLD water, the eyes will first move to the right and then the fast nystagmus component will be to the left, COLD = OPPOSITE OF LESION.
If you put warm water in this patient, the eyes will move slowly to the left, and then the fast nystagmus would be back to the left, WARM = SAME, SIDE OF LESION.
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"If He takes you to it, He'll take you through it."
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| rdsa3
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hi rida , it seems you are powerful in anatomy which authors book you used to study and did you study each and single word in the book and did you study with specimens ? please reply
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| neurite
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Good question.
As far as I know, if the right vestibular is injured, the left is unopposed. Thus the eyes slowly drift to the right as a response to the injury and then quickly to the left as being corrected by the cortex. My impression is that the slow movement is a response of a reflex through "lower" neurons (I mean, neurons in cranial nuclei without the involvement of the cortex) while fast movement to the opposite is the result of interference from the cortex.
1) However, I am not sure what will happen when the patient is in comatose. I would guess the eyes are deviated to the right with the fast component missing.
2) What will then happen if you do the caloric test?
3) What will happen if the patient is NOT in comatose but with an injured right vestibular nucleus and you do the caloric test on him/her (think about caloric test on two ears)?
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