In Tumor Lysis Syndrome, the signs due to hypocalcemia include all except
**Core Concept**
Tumor Lysis Syndrome (TLS) is a life-threatening condition that occurs when large numbers of cancer cells die rapidly, releasing their contents into the bloodstream and leading to electrolyte imbalances, including hypocalcemia, hyperkalemia, and hyperphosphatemia.
**Why the Correct Answer is Right**
Hypocalcemia in TLS is primarily due to the increased levels of phosphate ions, which bind to calcium ions, forming insoluble calcium phosphate complexes, thereby reducing the level of free calcium in the blood. This can lead to various clinical manifestations, including muscle cramps, tetany, and QT interval prolongation on the electrocardiogram.
**Why Each Wrong Option is Incorrect**
**Option A:** Chvostek's sign, a clinical indicator of hypocalcemia, is often seen in patients with TLS. Therefore, this option is incorrect.
**Option B:** Hypocalcemia can cause a prolongation of the QT interval on the electrocardiogram, which is a known complication of TLS. Thus, this option is incorrect.
**Option C:** Tetany, a condition characterized by muscle cramps, spasms, and tremors, is a well-documented consequence of hypocalcemia in TLS patients. This option is incorrect.
**Clinical Pearl / High-Yield Fact**
It is essential to note that TLS can occur with any rapidly proliferating tumor, not just hematological malignancies. Early recognition and management of TLS are crucial to prevent life-threatening complications.
**Correct Answer: D.**