The nurse is caring for the client with cardiac and renal disease. The client now has a serum potassium level of 6.0 mEq/L. Which medications, if prescribed, should the nurse administer? Select all that apply.

A. Hyponatremia: Hyponatremia is characterized by low sodium levels in the blood and can lead to symptoms such as weakness, confusion, and seizures. While hyponatremia can contribute to fluid imbalance, the client's presentation with shortness of breath, lower extremity swelling, crackles in the lungs, and elevated blood pressure is more indicative of fluid volume excess rather than hyponatremia.

B. Hypervolemia: Hypervolemia, or fluid volume excess, occurs when there is an abnormal increase in the extracellular fluid volume. This can lead to symptoms such as shortness of breath, crackles in the lungs (indicative of pulmonary edema), peripheral edema, and elevated blood pressure. Given the client's reported symptoms and assessment findings, hypervolemia is the most likely diagnosis.

C. Hypovolemia: Hypovolemia, or fluid volume deficit, occurs when there is a decrease in the extracellular fluid volume. This condition is characterized by symptoms such as thirst, dry mucous membranes, decreased urine output, and hypotension. The client in this scenario presents with signs and symptoms consistent with fluid volume excess rather than hypovolemia.

D. Hyperkalemia: Hyperkalemia is characterized by elevated potassium levels in the blood and can lead to symptoms such as muscle weakness, cardiac dysrhythmias, and nausea. While hyperkalemia can occur in clients with end-stage kidney disease, the client's reported symptoms and assessment findings are more suggestive of fluid volume excess rather than hyperkalemia.

A) Lactated Ringer's:
Lactated Ringer's solution is an isotonic crystalloid solution that contains electrolytes similar to those found in plasma. It is commonly used for fluid resuscitation and maintenance therapy but is not typically used for treating hypernatremia, as it contains sodium chloride and could exacerbate the client's condition.

B) Dextrose 10% in water:
Dextrose 10% in water is a hypertonic solution primarily used to provide calories and treat hypoglycemia. It does not address the underlying electrolyte imbalance in hypernatremia.

C) 0.45% sodium chloride:
0.45% sodium chloride, also known as half-normal saline, is a hypotonic solution used to treat hypernatremia by diluting the excess sodium in the bloodstream. It provides free water to rehydrate cells without adding excessive sodium. This solution is appropriate for clients with hypernatremia who require IV fluid therapy.

D) Dextrose 5% in 0.9% sodium chloride:
Dextrose 5% in 0.9% sodium chloride, also known as D5NS, is a hypertonic solution containing both dextrose and sodium chloride. While it provides water and calories, the sodium content may exacerbate hypernatremia rather than correct it. Therefore, it is not the most appropriate choice for a client with hypernatremia.