Confusion, constipation, and calcium of 14.8
A 64-year-old man with metastatic small-cell lung cancer is brought to the emergency department for progressive confusion, constipation, and diffuse weakness over 3 days. He recently started combination chemotherapy 1 week ago. Temperature is 36.8 C, blood pressure 108/68 mm Hg, pulse 96/min. Mucous membranes are dry. Laboratory studies show calcium 14.8 mg/dL, creatinine 1.9 mg/dL (baseline 1.0), phosphorus 2.1 mg/dL, uric acid 5.2 mg/dL, and potassium 3.8 mEq/L. ECG shows a shortened QT interval. After initial volume resuscitation, which of the following is the most appropriate next step in management?
See the answer and explanation below:
Post-Call Recovery Reads
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B
Explanation
Clinical Pearl:
Severe symptomatic hypercalcemia of malignancy is treated first with isotonic saline, then calcitonin for rapid but brief calcium lowering and an IV bisphosphonate for sustained effect. Loop diuretics are not routine therapy unless there is volume overload after rehydration.
Explanation:
This patient has severe symptomatic hypercalcemia of malignancy, suggested by confusion, constipation, weakness, dehydration, shortened QT interval, and a calcium level of 14.8 mg/dL. Current oncology and supportive care practice is aggressive isotonic saline followed by calcitonin for quick onset and an intravenous bisphosphonate such as zoledronic acid for more durable control, making option B the best answer. Prednisone is useful for calcitriol-mediated hypercalcemia, such as lymphoma or granulomatous disease, but not as standard initial therapy for most solid-tumor hypercalcemia. Hemodialysis is reserved for refractory cases or patients who cannot tolerate hydration, not as the next step in a hemodynamically stable patient. Rasburicase treats hyperuricemia in tumor lysis syndrome, which is not supported here because the uric acid and potassium are not elevated. Loop diuretics can worsen volume depletion and are only considered later if fluid overload develops after repletion.
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