What is a key nursing consideration when a patient is on digoxin for heart failure?

• A. Monitor for signs of toxicity and ensure therapeutic range, monitor potassium levels
• B. Monitor blood glucose levels
• C. Monitor liver enzymes
• D. Monitor respiratory rate only

Answer: (A)

Digoxin requires careful nursing monitoring because it has a narrow therapeutic window and its effects are highly influenced by electrolytes. The most important focus is watching for signs of digoxin toxicity and keeping the serum drug level within the prescribed therapeutic range. Potassium balance plays a key role here: low potassium (hypokalemia) increases digoxin binding to its receptor sites and raises the risk of toxicity, especially in patients also taking diuretics. So, monitoring potassium and aiming to keep it within normal limits helps reduce toxicity risk.

Equally important is watching for symptoms of digoxin toxicity itself, which can include nausea, vomiting, fatigue, confusion, visual disturbances (like blurred or yellow-green vision), and arrhythmias such as slowed heart rate or AV block. Since digoxin is cleared by the kidneys, assessing renal function and adjusting the dose as needed is also essential to prevent accumulation and toxicity.

Other monitoring, like blood glucose, liver enzymes, or respiratory rate, isn’t the primary concern with digoxin unless there are specific comorbidities, so the emphasis stays on therapeutic level maintenance and electrolyte balance to ensure safe, effective therapy.