<prompt> ECG feature of Hyperkalemia includesProlonged PRWide QRS complexProminent U WaveProlonged QT interval  <response>: B Wide QRS complex ECG is essential and may be instrumental in diagnosing HYPERKALEMIA in the appropriate clinical setting. ECG changes have a sequential progression of effects, which roughly correlate with the potassium level. ECG findings may be observed as follows: Early changes of hyperkalemia include peaked T waves, shortened QT interval, and ST-segment depression. These changes are followed by bundle-branch blocks causing a widening of the QRS complex, increases in the PR interval, and decreased amplitude of the P wave. These changes reverse with appropriate treatment.Without treatment, the P wave eventually disappears and the QRS morphology widens to resemble a sine wave. Ventricula fibrillation or asystole follows. ECG findings generally correlate with the potassium level, but potentially life-threatening arrhythmias can occur without warning at almost any level of hyperkalemia. Atrial fibrillation and J waves are not features of hyperkalemia. 