Potassium is an electrolyte that helps the heart move blood through the body. Not only is it vital to the electrical function of the heart, but it is also necessary to the kidneys, muscles, and nerves, all of which affect the cardiovascular system. Too much potassium in the blood (hyperkalemia), which can occur for various reasons, triggers palpitations and cardiac rhythm abnormalities including heart-stopping ventricular fibrillation.
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