A patient with pancreatic cancer has been admitted to the critical care unit with clinical signs consistent with syndrome of inappropriate secretion of antidiuretic hormone. Which clinical management strategy does the nurse anticipate for this condition?

Rationale:
A. This is incorrect because hand hygiene is the most critical intervention to prevent infection in immunosuppressed patients. Staff should strictly wash hands before and after all patient contact. Omitting hand washing would increase the risk of life-threatening infections.

B. This is incorrect because antimicrobial soaps are safe and often recommended for bathing immunosuppressed patients to reduce the risk of infection. Avoiding them could increase susceptibility to pathogens.

C. This is incorrect because placing multiple intravenous lines unnecessarily increases the risk of infection and does not prevent immunosuppression-related complications. IV lines should only be used as clinically indicated.

D. This is correct because placing the patient in a single room with HEPA filtration helps reduce exposure to airborne pathogens, which is essential for severely immunocompromised patients, such as those undergoing chemotherapy. Additional precautions include limiting visitors, using protective equipment, and maintaining strict aseptic technique during procedures.

Rationale:
A. Fatigue is incorrect because, although patients with diabetes insipidus (DI) may experience fatigue, this symptom is nonspecific. Fatigue can result from many conditions, including dehydration, electrolyte imbalances, chronic illness, or sleep disturbances. In DI, fatigue may develop secondary to fluid and electrolyte loss, but it is not a primary or diagnostic feature of the disorder.

B. Polydipsia is correct because it is the most indicative and classic symptom of DI. Diabetes insipidus results from either a deficiency of antidiuretic hormone (ADH, also called vasopressin) in central DI or the kidneys’ inability to respond to ADH in nephrogenic DI. Without adequate ADH activity, the kidneys cannot concentrate urine, leading to the excretion of large volumes of dilute urine (polyuria), sometimes up to 3–20 liters per day in severe cases. The body attempts to compensate for this fluid loss by triggering intense thirst (polydipsia), often resulting in the patient drinking large amounts of water to prevent dehydration. Polydipsia is thus a hallmark symptom and a key diagnostic clue for DI.

C. Weight gain is incorrect because the fluid loss associated with DI typically causes weight loss rather than gain. Patients may have decreased body mass due to the ongoing loss of water and potential electrolyte depletion. Weight gain is not associated with DI unless there is excessive water intake beyond renal capacity, which is uncommon.

D. Diarrhea is incorrect because DI affects renal water reabsorption, not gastrointestinal function. Diarrhea is unrelated to the pathophysiology of DI and may indicate a separate gastrointestinal issue rather than the endocrine disorder itself.