<prompt> In hypokalaemia all ECG changes are seen exceptDecreased T-wave amplitudeNormal ST segmentprolonged QT intervalU-wave  <response>: Electrocardiographic changes in hypokalemia include broad flat T waves, ST depression, u wave and QT prolongation. These are most marked when serum K is 2.7 mmolL. reference: harrisons principles of internal medicine,19E page-307 