The ECG change seen in hyperkalemia is

Hyperkalemia (plasma K+ +-7.0 meq/L). The PR and QRS intervals are within normal limits. Very tall, slender peaked T waves are now present. Hyperkalemia (plasma K+ +-8.5 meq/L). The QRS complex is broad and slurred and the QRS interval has widened to 0.2 s. The T waves remain tall and slender Fuher elevation of the plasma K+ level may result in ventricular tachycardia and ventricular fibrillation. Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No: 504