ECG: electrocardiogram; IV: intravenous. * Electrocardiographic changes suggestive of hyperkalemia include widening of the QRS complex, loss of P waves, or arrhythmias, but not isolated peaked T waves. ¶ For details of therapy, please refer to UpToDate topics on the management of hyperkalemia in children. Δ Nonemergent therapy given as adjunctive therapy to patients who receive emergent therapy and for patients with acute asymptomatic hyperkalemia with potassium levels <7 mEq/L not at risk for continued rise in potassium.