The treatment of choice in acute hyperkalemia of life threatening to cardiac myocytes is
**Core Concept**
Acute hyperkalemia is a potentially life-threatening condition that can lead to cardiac arrhythmias, muscle weakness, and even cardiac arrest. The goal of treatment is to rapidly lower serum potassium levels and stabilize cardiac membranes.
**Why the Correct Answer is Right**
In acute hyperkalemia, the treatment of choice involves administering calcium gluconate or calcium chloride to help stabilize cardiac membranes and counteract the cardiac effects of hyperkalemia. This is done to prevent cardiac arrhythmias and arrest. Additionally, insulin and glucose are given to drive potassium into cells, and potassium-binding resins are administered to remove excess potassium from the body. However, the immediate administration of calcium is crucial to stabilize the cardiac membranes.
**Why Each Wrong Option is Incorrect**
**Option A:** **Bicarbonate** is sometimes used to treat acidosis, but it is not the first-line treatment in acute hyperkalemia.
**Option B:** **Sodium polystyrene sulfonate** is a potassium-binding resin, but it takes time to work and is not the immediate treatment of choice in life-threatening hyperkalemia.
**Option C:** **Beta-2 agonists** can help drive potassium into cells, but they are not the first-line treatment in acute hyperkalemia and are not as effective as calcium in stabilizing cardiac membranes.
**Clinical Pearl / High-Yield Fact**
In acute hyperkalemia, the administration of calcium is crucial to stabilize cardiac membranes and prevent arrhythmias. This is a high-yield fact that can be remembered by the mnemonic "C-A-R-E" - Calcium, Activation of cellular potassium uptake, Removal of potassium, and Electrolyte correction.
**Correct Answer:** A. Calcium gluconate.