Final answer:
The best interpretation is that the patient is tolerating a lower heart rate now.
Step-by-step explanation:
The best interpretation of the finding is that the patient is tolerating a lower heart rate now. A normal heart rate for an adult ranges from 60-100 beats per minute (bpm), with bradycardia defined as a resting rate below 60 bpm. In this case, the pacemaker is set for 70 bpm, so a heart rate of 60 bpm is within the normal range and indicates that the patient is tolerating a lower heart rate.