<prompt> A 12-year old child with renal tubular acidosis type I is having muscle cramps and weakness. ECG shows all except:T wave inversion with U wavesST depressionHea rate of 75 beats per minuteAbsent P waves  <response>: ECG findings with ho renal tubular acidosis with co muscle cramps and weakness so Hypokalemia Hypokalemia ECG Increased width of the P waves Prolongation of the PR interval T wave flattening and inversion ST depression Prominent U waves Long QT interval due to fusion of the T and U wave long QU interval 