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Potassium plays a crucial role in maintaining the electrical stability of cardiac cells. An imbalance, particularly hyperkalemia (high potassium levels), can disrupt the normal depolarization and repolarization processes of the heart, leading to altered heart rhythms. This can result in bradycardia, arrhythmias, or even complete cardiac arrest, as the heart struggles to maintain effective pumping action. In severe cases, elevated potassium levels can lead to asystole, where the heart ceases to beat altogether.

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