Correct Answer: A

Rationale: The correct answer is A: 'Blow cool air from a hairdryer under the cast.' Blowing cool air can help relieve itching without damaging the cast or causing injury. Choice B, twisting the cast back and forth, can lead to discomfort, skin irritation, or even injury. Choice C, shaking powder into the cast, can create a mess, increase the risk of skin issues, and interfere with proper healing. Choice D, pushing a pencil under the cast edge, is dangerous as it can cause injury to the child's skin or the underlying tissues. Therefore, the safest and most effective option to relieve itching under the cast is to blow cool air from a hair dryer.

Correct Answer: A

Rationale: The correct action the nurse should take first is to refer the client to a healthcare provider for a pelvic examination. This is important to rule out serious conditions that may be causing the abdominal pain and dysmenorrhea. While notifying the parents, determining the date of the client's last menstrual period, and asking the client to lie down for a pelvic examination could be necessary steps, the priority is to ensure a proper evaluation by a healthcare provider to address the client's presenting symptoms effectively.

Correct Answer: B

Rationale: The correct instruction is to advise the client to avoid alcohol while taking phenytoin. Alcohol can interact with phenytoin, making it less effective and leading to increased side effects. Taking the medication with meals (Choice A) may help reduce gastrointestinal upset but is not the most crucial instruction for this medication. Limiting sodium intake (Choice C) is not directly related to phenytoin therapy. Taking the medication at bedtime (Choice D) is not a standard instruction for phenytoin administration.

Correct Answer: C

Rationale: The correct answer is to implement seizure precautions. Phenytoin is an antiepileptic medication used for seizure control. Seizure precautions are crucial for clients taking this medication to ensure their safety during a seizure episode. Monitoring serum calcium levels (Choice A) is not directly related to phenytoin therapy. Obtaining a baseline electrocardiogram (Choice B) is important for some medications but not the priority for a client on phenytoin. Encouraging a low-protein diet (Choice D) is not specifically indicated for clients on phenytoin and is not the most important intervention.

Correct Answer: A

Rationale: The correct answer is 'Ineffective airway clearance.' Following a ureter lithotomy via a flank incision, the highest priority nursing problem is ensuring the client's airway remains clear. This is crucial for effective breathing and oxygenation. Altered nutrition, fluid volume excess, and activity intolerance are important to address but are of lower priority compared to maintaining a clear airway postoperatively.