Digoxin Toxicity Signs and Patient Monitoring

A 72-year-old male patient is prescribed digoxin for heart failure management. During a follow-up visit, the nurse reviews the patient's medication history and notes that he is also taking a loop diuretic. The nurse understands that digoxin can have potential adverse effects if the patient's potassium levels fall too low due to the diuretic's effect. Which of the following statements by the patient indicates a potential adverse effect of digoxin that the nurse should monitor closely?