Prominent U waves on the ECG is a feature of -: (A) Hyponatremia, (B) Hypernatremia, (C) Hypokalemia, (D) Hyperkalemia
Answer is C. Electrocardiographic changes in hypokalemia include broad flat T waves, ST depression, u wave and QT prolongation. (reference: harrisons principles of internal medicine,19E page-307)