Which acute changes in serum chemistries would be expected in a patient who is experiencing tumor lysis syndrome?

Which acute changes in serum chemistries would be expected in a patient who is experiencing tumor lysis syndrome?

• A. Hyperkalemia and hyperphosphatemia
• B. Hypercalcemia and hypomagnesemia
• C. Hypernatremia and hypermagnesemia
• D. Hypoalbuminemia and hyperphosphatemia

Answer: (A)

Tumor lysis syndrome happens when a large number of tumor cells are destroyed rapidly, releasing their intracellular contents into the bloodstream. The immediate changes you’d see in serum chemistry are from those intracellular stores spilling into the blood: potassium, which is mostly inside cells, rises quickly causing hyperkalemia, and phosphate, also abundant inside cells, rises causing hyperphosphatemia. These shifts can lead to other downstream effects, like calcium dropping (calcium binds to the excess phosphate, producing hypocalcemia) and uric acid increasing from nucleic acid breakdown, which can threaten kidney function. So, the combination of hyperkalemia and hyperphosphatemia best reflects the acute ionic disturbances in TLS. Hypercalcemia would not be expected—often calcium decreases due to phosphate binding. The other listed patterns don’t match the core electrolyte changes seen with rapid tumor cell breakdown.

Tumor lysis syndrome happens when a large number of tumor cells are destroyed rapidly, releasing their intracellular contents into the bloodstream. The immediate changes you’d see in serum chemistry are from those intracellular stores spilling into the blood: potassium, which is mostly inside cells, rises quickly causing hyperkalemia, and phosphate, also abundant inside cells, rises causing hyperphosphatemia. These shifts can lead to other downstream effects, like calcium dropping (calcium binds to the excess phosphate, producing hypocalcemia) and uric acid increasing from nucleic acid breakdown, which can threaten kidney function.

So, the combination of hyperkalemia and hyperphosphatemia best reflects the acute ionic disturbances in TLS. Hypercalcemia would not be expected—often calcium decreases due to phosphate binding. The other listed patterns don’t match the core electrolyte changes seen with rapid tumor cell breakdown.