<prompt> Abnormal increase in the amplitude of U wave is seen withAmiodaroneHypokalemiaQuinidineAll of the above  <response>: Ans. d All of the above Ref. Harrisons Internal medicine, p. 1314; Topol cardiology Textbook, p. 158U Wave Occurs due to repolarisation of papillary muscles Ganong Physiology p. 550, 22nd edition Normally upright 1 mm or 10 of height of T wave 