Tumor lysis syndrome is associated with all of the following laboratory features except –
**Core Concept**
Tumor lysis syndrome (TLS) is a life-threatening complication that occurs when a large number of cancer cells die rapidly, releasing their contents into the bloodstream. This leads to a series of electrolyte and metabolic disturbances, including hyperkalemia, hyperphosphatemia, hypocalcemia, and acute kidney injury.
**Why the Correct Answer is Right**
The correct answer is associated with the pathophysiology of TLS, which involves the breakdown of cancer cells and the release of their intracellular contents into the bloodstream. This includes potassium, phosphate, and nucleic acids, which can lead to hyperkalemia, hyperphosphatemia, and hypocalcemia. The kidneys may become overwhelmed, leading to acute kidney injury.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because TLS is indeed associated with hyperkalemia, which occurs when potassium is released from the lysed cancer cells.
* **Option B:** This option is incorrect because TLS is indeed associated with hyperphosphatemia, which occurs when phosphate is released from the lysed cancer cells.
* **Option C:** This option is incorrect because TLS is indeed associated with acute kidney injury, which occurs when the kidneys become overwhelmed by the high levels of electrolytes and waste products.
**Clinical Pearl / High-Yield Fact**
It's essential to recognize the clinical presentation of TLS, which can include cardiac arrhythmias, muscle weakness, and respiratory failure. Early recognition and treatment with hydration, alkalinization, and renal replacement therapy can improve outcomes.
**Correct Answer: D.**