In a patient on digoxin, which electrolyte should be monitored in addition to digoxin levels?

In a patient on digoxin, which electrolyte should be monitored in addition to digoxin levels?

• A. Calcium
• B. Sodium
• C. Magnesium
• D. Potassium

Answer: (D)

Potassium balance is crucial when a patient is on digoxin because potassium and digoxin compete for the same Na+/K+-ATPase pump in cardiac cells. When potassium is low, digoxin binds more readily, heightening its effects and the risk of digoxin toxicity, which can manifest as arrhythmias, GI symptoms, and vision changes. Keeping potassium within the normal range helps prevent toxicity and supports safe digoxin therapy, in addition to monitoring the digoxin level as ordered. Conversely, if toxicity does occur, hyperkalemia can be a sign due to pump inhibition, underscoring the link between this electrolyte and digoxin effect. While calcium and magnesium levels can influence cardiac excitability, potassium remains the electrolyte most closely tied to digoxin safety.

Potassium balance is crucial when a patient is on digoxin because potassium and digoxin compete for the same Na+/K+-ATPase pump in cardiac cells. When potassium is low, digoxin binds more readily, heightening its effects and the risk of digoxin toxicity, which can manifest as arrhythmias, GI symptoms, and vision changes. Keeping potassium within the normal range helps prevent toxicity and supports safe digoxin therapy, in addition to monitoring the digoxin level as ordered. Conversely, if toxicity does occur, hyperkalemia can be a sign due to pump inhibition, underscoring the link between this electrolyte and digoxin effect. While calcium and magnesium levels can influence cardiac excitability, potassium remains the electrolyte most closely tied to digoxin safety.