Correct Answer: A

Rationale: The correct action by the nurse is to assess the client's blood pressure and pulse. Difficulty breathing can be a sign of various conditions, including cardiac issues. Assessing blood pressure and pulse helps in determining the client's hemodynamic status and identifying any cardiovascular compromise. Option B is less crucial as attaching the client to a pulse oximeter may provide oxygen saturation levels but does not directly assess cardiac output. Option C is not the priority in this situation as the client's difficulty breathing is a more urgent concern. Option D is incorrect as urgent radiation therapy is not indicated based on the client's presentation.

Correct Answer: A

Rationale: The correct answer is A: Encouraging fluids. In a client with multiple myeloma, encouraging fluids is a priority intervention to prevent kidney damage from high calcium levels. Adequate hydration helps maintain renal function and prevents complications. Providing frequent oral care (Choice B) is essential for clients at risk of mucositis or oral infections, such as those undergoing chemotherapy. Coughing and deep breathing exercises (Choice C) are commonly used for clients at risk of respiratory complications, like postoperative patients. Monitoring the red blood cell count (Choice D) is important for conditions like anemia but is not the priority in a client with multiple myeloma, where fluid management is crucial.

Correct Answer: C

Rationale: Monitoring hemoglobin and hematocrit is essential to assess the effectiveness of ruxolitinib in treating myelofibrosis. Ruxolitinib works by inhibiting JAK1 and JAK2, which are involved in the signaling pathways that regulate blood cell production. Therefore, monitoring hemoglobin and hematocrit levels can provide valuable information on how well the drug is managing the disease. Blood pressure, white blood cell count, and spleen size are not direct indicators of the treatment's effectiveness in myelofibrosis.

Correct Answer: C

Rationale: In the context of AML, the 5-year survival rate significantly decreases with age. The 5-year survival rate for patients over 75 years old is less than 2% compared to 43% for those 50 years or younger, and 19% for those between 50 and 64 years. Choice A is incorrect as early diagnosis does not necessarily guarantee good outcomes in AML. Choice B is inaccurate as the 5-year survival rate is not approximately 50% for older adults with AML. Choice D is incorrect as survival rates for AML patients are influenced by various factors beyond just the pre-illness level of health.

Correct Answer: D

Rationale: The correct answer is D, Electrocardiographic changes. In clients with metastatic prostate cancer, hypercalcemia can lead to various signs and symptoms. Electrocardiographic changes are considered a late sign of hypercalcemia, indicating severe electrolyte imbalance. Headache (choice A), dysphagia (choice B), and constipation (choice C) are earlier signs of hypercalcemia and may precede the development of more severe symptoms like electrocardiographic changes.