Is heart rate fast or slow in hyperkalemia?
Dec 06, 2022
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
High serum potassium usually causes slow heart rate. Hyperkalemia is typically caused by excessive potassium supplementation or reduced urinary potassium excretion. When potassium levels in the body become too high, potassium metabolism is disrupted and elevated potassium concentration in the blood affects cardiac function, leading to intraventricular conduction block, impaired myocardial contractility, bradycardia, and even cardiac arrest.
High blood potassium usually causes slow heart rate.
Elevated blood potassium levels typically result from excessive potassium intake, reduced urinary excretion of potassium, or underlying conditions such as metabolic acidosis and hyperglycemia that lead to increased release of potassium ions from cells. It may also be caused by medications used to treat hypertension or heart disease. Potassium ions are an essential electrolyte in the human body; however, when potassium levels become too high, potassium metabolism is disrupted, leading to elevated serum potassium concentrations. If accompanied by abnormalities in other electrolytes, this imbalance can impair cardiac function by altering myocardial cell automaticity, excitability, and conductivity. This may trigger intraventricular conduction blocks, reduce myocardial contractility, and result in bradycardia (slowed heart rate). If high blood potassium is not promptly managed and serum potassium continues to rise, severe cases may lead to cardiac arrest, endangering the patient's life.
Patients with high blood potassium should avoid foods or medications high in potassium to prevent worsening of their condition. They should receive treatment under medical supervision and must not self-medicate to avoid adverse reactions.
