A nurse observes a patient whose right eye is fixed and dilated, for which cranial nerve (CN) would the nurse suspect nerve compression?
CNV
CN VIII
CN IV
CN III
The Correct Answer is D
A. CN V (Trigeminal nerve) is responsible for sensation in the face and motor function for chewing, not eye movement or pupil constriction.
B. CN VIII (Vestibulocochlear nerve) deals with hearing and balance, not eye function.
C. CN IV (Trochlear nerve) controls eye movement, but it does not typically affect the pupil in this way.
D. Cranial nerve III (Oculomotor nerve) controls most eye movements and pupil constriction. A fixed and dilated pupil typically indicates damage to CN III, which may be due to nerve compression, often from increased intracranial pressure or herniation.
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Related Questions
Correct Answer is D
Explanation
A. CN V (Trigeminal nerve) is responsible for sensation in the face and motor function for chewing, not eye movement or pupil constriction.
B. CN VIII (Vestibulocochlear nerve) deals with hearing and balance, not eye function.
C. CN IV (Trochlear nerve) controls eye movement, but it does not typically affect the pupil in this way.
D. Cranial nerve III (Oculomotor nerve) controls most eye movements and pupil constriction. A fixed and dilated pupil typically indicates damage to CN III, which may be due to nerve compression, often from increased intracranial pressure or herniation.
Correct Answer is D
Explanation
A. A ventriculostomy involves inserting a catheter into the ventricles of the brain to monitor ICP, not a procedure for instilling drugs.
B. A ventriculostomy involves the insertion of a catheter to monitor ICP, not an internal transducer.
C. Cerebrospinal fluid (CSF) samples can be taken via ventriculostomy; the procedure does not prevent this.
D. A ventriculostomy measures the pressure within the brain’s ventricles to monitor intracranial
pressure, which is the correct understanding.
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