<prompt> Initial ECG change in Hyperkalemia is?Tall tented T wavesPR prolongationqRS wideningST segment depression  <response>: Ans.a Tall tented T wavesRef: Harrison 19th ed. 310Serum potassium 5.5 mEqL is associated with repolarization abnormalities: Peaked T waves usually the earliest sign of hyperkalemia Serum potassium 6.5 mEqL is associated with progressive paralysis of the atria: P wave widens and flattens PR segment lengthens P waves eventually disappearSerum potassium 7.0 mEqL is associated with conduction abnormalities and bradycardia: Prolonged QRS interval with bizarre QRS morphology High-grade AV block with slow junctional and ventricular escape rhythms Any kind of conduction block bundle branch blocks, fascicular blocks Sinus bradycardia or slow AF Development of a sine wave appearance a pre-terminal rhythmSerum potassium level of 9.0 mEqL causes cardiac arrest due to: Asystole Ventricular fibrillation 