Hyperkalemia is caused by : a) Amphotericin B b) ACE Inhibitors c) Cyclosporine d) GM-CSF e) Succinylcholine
**Core Concept**
Hyperkalemia is a condition characterized by elevated serum potassium levels, which can lead to cardiac arrhythmias, muscle weakness, and even cardiac arrest. The underlying principle being tested here is the effect of various medications and substances on potassium balance.
**Why the Correct Answer is Right**
Succinylcholine is a depolarizing neuromuscular blocking agent that can cause a transient release of potassium ions from muscle cells, leading to hyperkalemia. This effect is due to the prolonged depolarization of muscle cells, which triggers an efflux of potassium ions into the bloodstream. Succinylcholine is often used in anesthesia and emergency medicine, but its use requires careful monitoring of potassium levels, especially in patients with pre-existing kidney disease or muscle damage.
**Why Each Wrong Option is Incorrect**
* **Option A:** Amphotericin B is an antifungal medication that can cause hypokalemia (low potassium levels) due to its effect on renal potassium excretion.
* **Option B:** ACE inhibitors are used to treat hypertension and heart failure, and they can cause hyperkalemia as a side effect, but they are not the most direct cause of hyperkalemia compared to the other options.
* **Option C:** Cyclosporine is an immunosuppressant that can cause kidney damage and secondary hyperkalemia, but it is not as direct a cause of hyperkalemia as succinylcholine.
* **Option D:** GM-CSF (Granulocyte-Macrophage Colony-Stimulating Factor) is a cytokine that stimulates the production of white blood cells and does not have a direct effect on potassium balance.
**Clinical Pearl / High-Yield Fact**
Succinylcholine-induced hyperkalemia can be a life-threatening complication, especially in patients with pre-existing kidney disease or muscle damage. Always monitor potassium levels closely when using succinylcholine, and consider alternative neuromuscular blocking agents if possible.
**Correct Answer:** e. Succinylcholine