Correct Answer: A

Rationale: Step 1: Phenytoin is an anticonvulsant used to prevent seizures. Step 2: Anticonvulsants are often given before surgery to reduce the risk of seizures during and after the procedure. Step 3: In the context of intracranial surgery, controlling seizures is crucial to prevent complications like increased intracranial pressure. Step 4: Therefore, administering phenytoin before surgery helps in reducing the risk of seizures before and after the procedure. Summary: - Option B (avoid intraoperative complications) is too broad and doesn't directly relate to the use of phenytoin. - Option C (reduce cerebral edema) is not the primary indication for phenytoin in this scenario. - Option D (prevent postoperative vomiting) is not a common reason for administering phenytoin before intracranial surgery.

Correct Answer: A

Rationale: Step 1: Phenytoin is an anticonvulsant used to prevent seizures. Step 2: Anticonvulsants are often given before surgery to reduce the risk of seizures during and after the procedure. Step 3: In the context of intracranial surgery, controlling seizures is crucial to prevent complications like increased intracranial pressure. Step 4: Therefore, administering phenytoin before surgery helps in reducing the risk of seizures before and after the procedure. Summary: - Option B (avoid intraoperative complications) is too broad and doesn't directly relate to the use of phenytoin. - Option C (reduce cerebral edema) is not the primary indication for phenytoin in this scenario. - Option D (prevent postoperative vomiting) is not a common reason for administering phenytoin before intracranial surgery.

Correct Answer: B

Rationale: The correct answer is B: Related to impaired balance. The rationale for this is that a client with a cerebellar brain tumor may experience impaired balance due to the cerebellum's role in coordinating voluntary movements and maintaining balance. Impaired balance increases the risk for falls and other injuries. Visual field deficits, difficulty swallowing, and psychomotor seizures are not directly related to the cerebellum's functions in balance and coordination. Therefore, these choices are incorrect for this specific nursing diagnosis.

Correct Answer: C

Rationale: The correct answer is C: Sensorineural hearing loss. Hearing aids are most effective for sensorineural hearing loss as they amplify sound signals to compensate for damage to the inner ear hair cells or auditory nerve. This type of hearing loss is due to problems in the inner ear or auditory nerve, which can be partially compensated for by using hearing aids. The other choices, A: Conductive, B: Mixed, and D: Central, are not as effectively improved by hearing aids. Conductive hearing loss is usually due to problems in the outer or middle ear, which can often be treated with medical or surgical interventions. Mixed hearing loss involves a combination of conductive and sensorineural components, and may require a combination of interventions. Central hearing loss is due to problems in the central auditory pathways in the brain, and is not typically improved by hearing aids.

Correct Answer: C

Rationale: The correct answer is C: 2 hours. Blood should be administered within 30 minutes to 4 hours after removal from the refrigerator to prevent bacterial growth and maintain its efficacy. Option C falls within this timeframe, ensuring safety and effectiveness. Option A (1 hour) is too short, while option B (4 hours) and option D (6 hours) exceed the recommended timeframe, increasing the risk of bacterial contamination and compromising the quality of the blood product.