A patient with metastatic squamous cell carcinoma of the lung is admitted to the medical ward with profound lethargy, severe abdominal pain, and intractable vomiting. Initial laboratory analysis reveals a critically elevated serum calcium concentration of 15.2 mg/dL. Arrange the following therapeutic interventions in the standard sequential order of management, beginning with immediate acute stabilization, progressing through medical therapies based on their onset of action, and concluding with the definitive treatment for severe hypercalcemia if the patient subsequently develops anuric acute renal failure.
- 1Initiate aggressive volume resuscitation with intravenous isotonic saline.
- 2Administer calcitonin for rapid, short-term reduction of serum calcium.
- 3Administer an intravenous bisphosphonate for delayed but sustained osteoclast inhibition.
- 4Perform hemodialysis utilizing a low-calcium dialysate.
Cevap
The correct sequence is: 1) Intravenous isotonic saline, 2) Calcitonin, 3) Intravenous bisphosphonate, 4) Hemodialysis.
The correct management algorithm for severe hypercalcemia (greater than 14 mg/dL) prioritizes immediate stabilization followed by targeted pharmacotherapy. Severe hypercalcemia induces profound dehydration via nephrogenic diabetes insipidus, making aggressive isotonic saline the critical first step. Because bisphosphonates (the definitive medical treatment) take 48 to 72 hours to act, calcitonin is administered concurrently to rapidly reduce calcium levels within 4 to 6 hours. Zoledronic acid or pamidronate then provides sustained osteoclast inhibition. Finally, if the patient develops anuric acute renal failure and cannot tolerate aggressive hydration, hemodialysis becomes the necessary definitive treatment of last resort.
Adım Adım Çözüm
Anahtar Kavram
Standard stepwise management algorithm for severe hypercalcemia of malignancy.