Tumor lysis syndrome causes all EXCEPT:
**Core Concept**
Tumor lysis syndrome is a life-threatening condition that occurs when a large number of cancer cells die rapidly, releasing their contents into the bloodstream. This leads to an overload of cellular components, including potassium, phosphate, and nucleic acids, which can cause serious electrolyte imbalances and kidney damage.
**Why the Correct Answer is Right**
Tumor lysis syndrome is characterized by the release of intracellular contents, including potassium, phosphate, and uric acid, into the bloodstream. The high levels of potassium can lead to cardiac arrhythmias and muscle weakness, while the high levels of phosphate can contribute to the formation of calcium phosphate crystals in the kidneys, leading to nephrocalcinosis. The release of uric acid can also cause kidney damage by forming urate crystals.
**Why Each Wrong Option is Incorrect**
* **Option A:** Hyperkalemia is a common complication of tumor lysis syndrome, as the rapid release of intracellular potassium can lead to elevated serum potassium levels.
* **Option B:** Hyperphosphatemia is also a characteristic feature of tumor lysis syndrome, as the release of intracellular phosphate can lead to elevated serum phosphate levels.
* **Option D:** Hyperuricemia is another complication of tumor lysis syndrome, as the release of intracellular nucleic acids can lead to the formation of uric acid.
**Clinical Pearl / High-Yield Fact**
Tumor lysis syndrome is often seen in patients with high-grade lymphomas or leukemias, particularly those who are undergoing chemotherapy or radiation therapy. It is essential to monitor patients closely for signs of tumor lysis syndrome, including hyperkalemia, hyperphosphatemia, and hyperuricemia.
**Correct Answer: C. Hypocalcemia.**