Prioritizing Interventions for Hyperkalemia

A patient with a history of renal insufficiency is being monitored in the hospital for fluid and electrolyte imbalances. The nurse notes that the patient is exhibiting symptoms such as nausea, muscle cramps, and abnormal ECG changes. Laboratory results reveal a serum potassium level of 6.5 mEq/L. Which of the following nursing interventions should be prioritized to address this patient's condition?