Key result
Hypokalaemia affects 7-17% of cardiovascular patients and increases mortality up to 10-fold via Na+/K+-ATPase inhibition, CaMKII activation, and chronic hERG channel degradation.
Why the study?
Hypokalaemia is an independent risk factor for sudden cardiac death affecting 7–17% of cardiovascular patients, and current management relying on potassium supplementation incompletely addresses the underlying molecular remodelling processes.
Answers are grounded in this paper and cite their sources.
This review highlights that hypokalaemia-induced arrhythmogenesis involves chronic hERG channel internalisation, Na+/K+-ATPase inhibition, and CaMKII activation, suggesting that multi-mechanistic pharmacological strategies preserving hERG density alongside ion channel modulation may offer superior protection compared to reactive potassium supplementation alone.
Hypokalaemia is an independent risk factor for sudden cardiac death, affecting 7–17% of cardiovascular patients. This review examines mechanisms of hypokalaemia-induced arrhythmias, focusing on the human ether-a-go-go-related gene (hERG) potassium channel. Low extracellular potassium inhibits the Na+/K+ -ATPase and suppresses repolarising potassium currents, converging on intracellular calcium overload and action potential prolongation. These changes trigger calcium/calmodulin-dependent protein kinase II (CaMKII) activation, which phosphorylates ion channels to amplify arrhythmia substrate through early and delayed afterdepolarisations and re-entry. Critically, hERG undergoes chronic internalisation and degradation in hypokalaemia, functioning as an acquired channelopathy. Current management is reactive and relies on potassium supplementation, which incompletely addresses these molecular remodelling processes. Emerging pharmacological strategies targeting RyR2, CaMKII, and the late sodium current show promise, but mechanistic insights suggest that multi-mechanistic strategies which also maintain hERG may offer superior protection, particularly in structurally remodelled hearts. Understanding these mechanisms identifies therapeutic targets beyond electrolyte replacement.
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Jacob et al. (2026) conducted a review in Hypokalaemia-induced arrhythmias. Hypokalaemia (low extracellular potassium) vs. Normal extracellular potassium levels was evaluated on Sudden cardiac death and lethal arrhythmias via hERG channel dysregulation and CaMKII activation. Hypokalaemia affects 7-17% of cardiovascular patients and increases mortality up to 10-fold via Na+/K+-ATPase inhibition, CaMKII activation, and chronic hERG channel degradation.
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