In hyperkalemia with ECG changes, what is an immediate membrane-stabilizing treatment?

In hyperkalemia with ECG changes, what is an immediate membrane-stabilizing treatment?

• A. Insulin with glucose
• B. Albuterol inhalation
• C. Sodium bicarbonate
• D. Calcium gluconate

Answer: (D)

When hyperkalemia is causing ECG changes, the first priority is to stabilize the heart muscle so it won’t become arrhythmogenic despite the high potassium. IV calcium gluconate accomplishes this by stabilizing the cardiac membranes, raising the threshold for depolarization, and making myocardial cells less excitable. This effect happens quickly and buys time to lower the potassium through other treatments. The other options work to decrease potassium, but they don’t provide immediate membrane stabilization. Insulin with glucose and beta-agonists (albuterol) drive potassium into cells, and sodium bicarbonate can help if acidosis is present; both reduce serum potassium but take more time to act. Calcium gluconate, on the other hand, acts right away to protect the heart while definitive potassium-lowering therapies are implemented.

When hyperkalemia is causing ECG changes, the first priority is to stabilize the heart muscle so it won’t become arrhythmogenic despite the high potassium. IV calcium gluconate accomplishes this by stabilizing the cardiac membranes, raising the threshold for depolarization, and making myocardial cells less excitable. This effect happens quickly and buys time to lower the potassium through other treatments.

The other options work to decrease potassium, but they don’t provide immediate membrane stabilization. Insulin with glucose and beta-agonists (albuterol) drive potassium into cells, and sodium bicarbonate can help if acidosis is present; both reduce serum potassium but take more time to act. Calcium gluconate, on the other hand, acts right away to protect the heart while definitive potassium-lowering therapies are implemented.