See * U waves: a positive deflection after the T wave; (smaller than T waves) * Best seen w/ Bradycardia; * Axis: Anterior: (best seen V2-4, II, III, aVF); * Duration: Longer than P wave; * May indicate hypokalemia; / ___/_/ _/_/ (u wave)
Original Text by Clifford R. Wheeless, III, MD.