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Hypokalemia-Induced Arrhythmias and Heart Failure: New Insights and Implications for Therapy

Jonas Skogestad1, Jan Magnus Aronsen2,3

  • 1Division of Cardiovascular and Pulmonary Diseases, Institute of Experimental Medical Research, University of Oslo and Oslo University Hospital, Oslo, Norway.

Frontiers in Physiology
|November 23, 2018
PubMed

Insights

Hypokalemia, a common issue in heart failure patients, increases arrhythmia risk. Reduced Na+/K+-ATPase activity due to low potassium may trigger dangerous heart rhythms by affecting calcium levels.

Area of Science:

  • Cardiology
  • Electrophysiology
  • Molecular Biology

Background:

  • Hypokalemia (serum K+ < 3.5 mM) is prevalent in heart failure due to diuretics and neurohumoral activation.
  • It significantly increases the risk of ventricular arrhythmias and sudden cardiac death in heart failure patients.
  • Emerging evidence links hypokalemia-induced arrhythmias to reduced Na+/K+-ATPase (NKA) activity.

Purpose of the Study:

  • To review mechanistic evidence of hypokalemia-induced triggered arrhythmias.
  • To discuss how heart failure molecular changes may lower arrhythmia thresholds.
  • To explore potential antiarrhythmic treatment implications based on new insights.

Main Methods:

  • Review of current experimental and mechanistic evidence.
  • Analysis of molecular pathways involved in hypokalemia-induced arrhythmias.
  • Discussion of potential therapeutic targets.

Main Results:

  • Hypokalemia-induced arrhythmias may originate from reduced NKA activity.
  • This reduction can lead to intracellular calcium overload.
  • Calcium/Calmodulin-dependent kinase II (CaMKII) activation and afterdepolarizations are implicated.

Conclusions:

  • Understanding hypokalemia's role in arrhythmia mechanisms is crucial for heart failure management.
  • Molecular insights offer potential for novel antiarrhythmic therapies.
  • Targeting NKA or downstream pathways could mitigate hypokalemia-related cardiac events.

Keywords:
Na+ - K+-ATPasearrhythmia (heart rhythm disorders)calciumheart failurehypokalaemia

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