A 72-year-old male patient with known prostate cancer presents with new complaints of persistent lower back pain and unexplained fatigue. His PSA levels have recently increased despite ongoing treatment. Which nursing action is the most appropriate priority in this situation?

Choice A rationale Suggesting bed rest for a patient with potential metastatic bone disease is counterproductive and may lead to complications like hypercalcemia, which is common in bone metastasis. While rest might provide temporary symptomatic relief for muscle strain, it does not address the pathological cause of the pain in a cancer patient. Furthermore, prolonged immobility can lead to muscle wasting and increased bone demineralization, potentially worsening the patient's musculoskeletal status and overall functional decline. Choice B rationale Monitoring symptoms for a week is an inappropriate delay in care for a patient with rising PSA levels and new onset back pain. PSA is a protein produced by the prostate, and levels above 4 ng/mL often indicate progression or recurrence. Waiting allows potential metastatic lesions to grow and increases the risk of spinal cord compression or pathological fractures. Immediate assessment is required to ensure that any oncological progression is managed before it causes irreversible neurological damage. Choice C rationale Prostate cancer frequently metastasizes to the axial skeleton, particularly the lower spine, which manifests as persistent back pain. An increasing PSA level in a patient with known cancer strongly suggests disease progression or treatment failure. Reporting these findings immediately allows for urgent imaging, such as a bone scan or MRI, to detect metastatic lesions. Early identification is crucial to initiate palliative radiation or systemic therapy to prevent debilitating skeletal-related events and manage the patient's systemic disease. Choice D rationale While maintaining hydration is important for general health and kidney function, particularly in elderly patients, it does not address the underlying threat of metastatic prostate cancer. Fatigue in cancer patients is multifactorial, often related to anemia, psychological stress, or the metabolic demands of the tumor itself. Increasing fluids will not alleviate pain caused by bone lesions or stop the progression of the malignancy, making this a secondary concern compared to the urgent need for diagnostic evaluation.