Hypokalemia increases the risk of digoxin toxicity. True or false?

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Prepare for the Mark Klimek Electrolytes and Endocrine Test. Utilize flashcards, multiple choice questions, and detailed explanations for each query to enhance your understanding. Ace your exam!

Multiple Choice

Hypokalemia increases the risk of digoxin toxicity. True or false?

Explanation:
Potassium levels modify how digoxin works at the cellular level. Digoxin binds to the Na+/K+-ATPase pump at the same site where potassium acts. When potassium is low, there’s less competition for that site, so more digoxin binds the pump and inhibits its activity more strongly. This amplified inhibition raises intracellular calcium via the Na+/Ca2+ exchanger, which boosts the heart’s contractile effect but also increases the risk of dangerous toxic effects, especially arrhythmias. Clinically, hypokalemia—often from diuretics or GI losses—puts someone at higher risk for digoxin toxicity even at standard doses. So, the statement is true.

Potassium levels modify how digoxin works at the cellular level. Digoxin binds to the Na+/K+-ATPase pump at the same site where potassium acts. When potassium is low, there’s less competition for that site, so more digoxin binds the pump and inhibits its activity more strongly. This amplified inhibition raises intracellular calcium via the Na+/Ca2+ exchanger, which boosts the heart’s contractile effect but also increases the risk of dangerous toxic effects, especially arrhythmias. Clinically, hypokalemia—often from diuretics or GI losses—puts someone at higher risk for digoxin toxicity even at standard doses. So, the statement is true.

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