Electrocardiographic manifestations of hvperkalemia :ECG changes often do not correlateQ with the degree of hyperkalemiaE.C.G changes suggestive of an effect of hyperkalemia on cardiac conduction include :Peaked T waves (tall tented T waves)Q - Prolongation of the PR intervalQ Widening of the QRSQ - Loss of the P waveQ Sine wave patternQ Sinus arrestQ In patients with organic heart disease and abnormal baseline ECG, bradycardia may be the only new ECG abnormality. Hyperkalemia may ultimately lead to cardiac arrest (asystole) or Ventricular fibrillation Hyper kalemia is defined as serum potassium > 5 meq/L.