A nurse is collecting data from an infant who has heart failure and is taking digoxin. The nurse should identify which of the following findings as an indication of digoxin toxicity?

A. Bradycardia: Digoxin toxicity in infants often presents with bradycardia, as the drug slows conduction through the heart. Close monitoring of heart rate is essential, especially before each dose, since a low rate may indicate toxicity. B. Jaundice: Jaundice is not a typical sign of digoxin toxicity. It is more commonly associated with liver dysfunction, hemolysis, or neonatal physiological processes, not cardiac glycoside overdose. C. Edema: Edema is a symptom of heart failure itself rather than digoxin toxicity. While it may persist in infants on digoxin, it does not directly reflect toxic drug levels. D. Purulent sputum: Purulent sputum is a sign of respiratory infection and has no direct association with digoxin toxicity. It may occur in other conditions but is not a relevant indicator here.