<prompt> A 78-year-old man with advanced renal disease has the ECG shown in Figure below lead II. What is the diagnosis?hyperkalemiahypercalcemiahypernatremiapericarditis  <response>: No atrial activity is detected. The ventricular rate is slightly irregular. Beat number 4 is a ventricular premature contraction. The T waves are tall and markedly peaked. This type of T wave is characteristic of hyperkalemia, as is absence of visible atrial activity.The potassium level was 8.2mmolL. 