Key result
Low-normal and moderately low potassium levels increase ventricular arrhythmia susceptibility in CPVT mice.
Hypokalemia promotes ventricular arrhythmias in CPVT via Na+/K+ ATPase inhibition and subsequent CaMKII activation.
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Hypokalemia may heighten CPVT arrhythmia risk via Na+/K+ ATPase; animal data leaves open human translation and targeted therapies.
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Robinson et al. (2022) studied Catecholaminergic polymorphic ventricular tachycardia (CPVT). Low-normal and moderately low extracellular potassium concentrations vs. Control mice was evaluated on Time to occurrence of the first spontaneous ventricular arrhythmia and percentage of mice developing ventricular arrhythmia. Low-normal and moderately low extracellular potassium levels increased susceptibility to ventricular arrhythmia in 5-to-6-month-old CPVT mice compared with controls.
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