Which condition explains hyperphosphatemia via massive cellular lysis releasing intracellular phosphate?

Which condition explains hyperphosphatemia via massive cellular lysis releasing intracellular phosphate?

• A. Chemotherapy
• B. Inability to excrete phosphate
• C. Increased calcium citrate complexation
• D. Crush injury

Answer: (A)

Massive cellular lysis dumps intracellular phosphate into the bloodstream, and chemotherapy is a classic trigger for this. When cytotoxic therapy rapidly kills a large burden of tumor cells, their contents spill out faster than the kidneys can excrete them. The sudden surge of phosphate raises serum phosphate levels (hyperphosphatemia). Because phosphate binds calcium, the increased phosphate drives calcium into precipitates, lowering free calcium and contributing to hypocalcemia. This pattern is the hallmark of tumor lysis syndrome, a dangerous complication of chemotherapy in patients with high tumor burden. Crush injury can also release phosphate, but the scenario most closely linked to massive, therapy-induced cell death is chemotherapy-driven tumor lysis.

Massive cellular lysis dumps intracellular phosphate into the bloodstream, and chemotherapy is a classic trigger for this. When cytotoxic therapy rapidly kills a large burden of tumor cells, their contents spill out faster than the kidneys can excrete them. The sudden surge of phosphate raises serum phosphate levels (hyperphosphatemia). Because phosphate binds calcium, the increased phosphate drives calcium into precipitates, lowering free calcium and contributing to hypocalcemia. This pattern is the hallmark of tumor lysis syndrome, a dangerous complication of chemotherapy in patients with high tumor burden. Crush injury can also release phosphate, but the scenario most closely linked to massive, therapy-induced cell death is chemotherapy-driven tumor lysis.