Podcast 799: EKG Abnormalities in Renal Failure

Podcast 799: EKG Abnormalities in Renal Failure

Contributor: Peter Bakes, MD

Educational Pearls:

  • Patients in renal failure may have elevated serum potassium levels which can result in EKG changes.
  • EKG changes in the setting of hyperkalemia generally depend on the serum level. Mild elevation may cause peaked T waves. At higher serum levels there will be loss of P waves plus wide complex tachycardia. There can be progression to fatal arrhythmias.
  • Treatment of acute hyperkalemia involves multiple mechanisms. Calcium gluconate stabilizes the cardiac membrane (of note, its duration of action is 1 hour). Insulin with Glucose and Bicarbonate both act to shift extracellular potassium into cells. Enhanced elimination of potassium is accomplished via Kayexalate or Lokelma. Definitive treatment for hyperkalemia is hemodialysis.
  • The differential for wide complex non-tachycardic rhythm on EKG includes: left ventricular hypertrophy, left bundle branch block, pacemaker, electrolyte abnormalities including hyperkalemia.

References

Palmer BF, Clegg DJ. Diagnosis and treatment of hyperkalemia. Cleve Clin J Med. 2017;84(12):934-942. doi:10.3949/ccjm.84a.17056

Watanabe R. Hyperkalemia in chronic kidney disease. Rev Assoc Med Bras (1992). 2020;66Suppl 1(Suppl 1):s31-s36. Published 2020 Jan 13. doi:10.1590/1806-9282.66.S1.31

Summarized by Kirsten Hughes, MS4 | Edited by John Spartz, MD & Erik Verzemnieks, MD

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