**Question:** All are measures taken to address hyperkalemia in acute kidney injury, except

A. Insulin and glucose
B. Dexamethasone
C. Hemodialysis
D. Calcium gluconate

**Correct Answer:** D. Calcium gluconate

**Core Concept:** Hyperkalemia is a condition characterized by elevated potassium levels in the blood, which can lead to serious cardiac arrhythmias and potentially life-threatening complications. In acute kidney injury (AKI), addressing hyperkalemia is crucial to prevent these complications.

**Why the Correct Answer is Right:** Calcium gluconate is a calcium supplement used to treat hypocalcemia, or low calcium levels, not hyperkalemia. Its primary role is to increase blood calcium levels, which is diametrically opposed to the management of hyperkalemia. Therefore, using calcium gluconate in the context of hyperkalemia management is incorrect.

**Why Each Wrong Option is Incorrect:**

A. Insulin and glucose (Option A): Insulin and glucose are used to lower blood glucose levels, not address hyperkalemia. They are part of the management of hyperglycemia, not hyperkalemia.

B. Dexamethasone (Option B): Dexamethasone is a corticosteroid used for its anti-inflammatory and immunosuppressive properties. It is not a specific treatment for hyperkalemia, so it is incorrect in the context of hyperkalemia management.

C. Hemodialysis (Option C): Hemodialysis is a specific intervention that removes excess potassium from the bloodstream, which directly addresses hyperkalemia. This option is correct as it is a method to reduce potassium levels in hyperkalemia management.

**Clinical Pearl:**

In the context of managing hyperkalemia in AKI patients, it is essential to differentiate between treatments for hyperkalemia and those for hypokalemia (low potassium levels). Calcium supplementation for hypocalcemia or insulin and glucose for hyperglycemia are incorrect interventions for hyperkalemia. Hemodialysis is the appropriate method to remove excess potassium, whereas insulin and glucose are used for hypoglycemia and calcium supplementation is used for hypocalcemia.