Choice A rationale:

The nurse should monitor vital signs, pain level, neurological status, and eye function for a client with shingles to assess for any complications or worsening of the condition. Vital signs may indicate signs of infection, pain level may help assess the effectiveness of pain management, neurological status can indicate any neurological complications, and eye function is important as shingles affecting the ophthalmic nerve can lead to eye complications.

Choice B rationale:

Administering medications as prescribed is crucial to manage the symptoms and complications of shingles. Antiviral medications can help reduce the severity and duration of the outbreak, while pain medications may be necessary to alleviate discomfort. The nurse should also monitor for adverse effects to ensure the client's safety during treatment.

Choice D rationale:

Isolating the patient until all lesions are crusted over is necessary to prevent the spread of the varicella-zoster virus, which causes shingles. Direct contact with vesicles can lead to transmission of the virus to susceptible individuals, particularly those who have not had chickenpox or received the varicella vaccine.

Choice E rationale:

Providing comfort measures is essential in managing the symptoms of shingles. Cool compresses can help relieve pain and inflammation, loose clothing can prevent irritation of the affected area, distraction techniques can divert the client's attention from discomfort, and relaxation methods can help reduce stress and promote healing.

Choice C rationale:

Encouraging the client to scratch the affected area is not appropriate care for shingles. Scratching can lead to skin damage, increase the risk of infection, and potentially worsen the condition. It is essential to advise against scratching and promote gentle care of the affected area instead.