A nurse is preparing to administer digoxin to a 16-month-old infant. Prior to administering the dose, the nurse measures the apical heart rate. The nurse should withhold the dose if the infant's apical heart rate is less than what rate?

In infants and young children, digoxin should be withheld if the apical heart rate is below 90 beats per minute to prevent the risk of digoxin toxicity, which can cause serious cardiac complications such as bradycardia or arrhythmias. Monitoring the apical heart rate before administration helps ensure the safe use of digoxin.