Yes. Anti-theft security systems in shops and libraries generate electromagnetic fields that detect embedded tags on merchandise. Under unusual circumstances, these fields could temporarily affect the operation of your heart device, but significant interference is unlikely if you walk through normally.
It is recommended that you:
Be aware of anti-theft detector gates as you enter and leave
Walk through at a normal pace and do not linger near the equipment
If you experience any symptoms such as dizziness or palpitations near a security system, move away promptly. Your device will resume normal operation once you are clear of the equipment.