• Pacemakers are implants that are put in the heart to help manage the rate of your heartbeat.
• After a heart attack, surgery, or a medicine overdose, they can be temporarily implanted to treat a weak heartbeat.
• They can be permanently implanted to correct a slow or irregular pulse or, in some cases, to assist in the treatment of heart failure.

Reference : Pacemaker. (n.d.). Retrieved from https://www.cardiacmd.com/we-treat/device-clinic/pacemaker