Which electrolyte levels should be monitored to avoid digoxin toxicity in a heart failure patient?

Which electrolyte levels should be monitored to avoid digoxin toxicity in a heart failure patient?

• A. Sodium and Chloride
• B. Magnesium and Potassium
• C. Calcium Only
• D. Magnesium, Potassium, and Calcium

Answer: (D)

Digoxin’s effect on the heart depends on the surrounding electrolyte balance because it works by inhibiting the Na+/K+ ATPase, which increases intracellular calcium to boost contractility. The risk of digoxin toxicity is shaped by potassium, magnesium, and calcium levels. Low potassium heightens digoxin’s binding to the pump, raising the danger of arrhythmias. Low magnesium removes a protective stabilizer of cardiac cells, increasing susceptibility to toxicity and arrhythmias. High calcium can exaggerate the digoxin-induced rise in intracellular calcium, also promoting toxic effects and arrhythmias. In a heart failure patient on digoxin, regularly checking and correcting these three electrolytes helps prevent toxicity, especially since diuretics can cause potassium and magnesium losses and various conditions can affect calcium.

Digoxin’s effect on the heart depends on the surrounding electrolyte balance because it works by inhibiting the Na+/K+ ATPase, which increases intracellular calcium to boost contractility. The risk of digoxin toxicity is shaped by potassium, magnesium, and calcium levels. Low potassium heightens digoxin’s binding to the pump, raising the danger of arrhythmias. Low magnesium removes a protective stabilizer of cardiac cells, increasing susceptibility to toxicity and arrhythmias. High calcium can exaggerate the digoxin-induced rise in intracellular calcium, also promoting toxic effects and arrhythmias. In a heart failure patient on digoxin, regularly checking and correcting these three electrolytes helps prevent toxicity, especially since diuretics can cause potassium and magnesium losses and various conditions can affect calcium.