Sometimes lifestyle change and medication aren’t enough to combat heart disease. When other treatments are no longer effective, your physician may recommend an implantable cardiac device (pacemaker) to help monitor and or regulate the rhythm of your heart. There are different types of implantable devices, and it depends on your diagnosis as to which type your doctor will choose for you. Cardiac resynchronization therapy (CRT) pacemakers help a very slow heart beat more regularly. Implantable cardioverter defibrillators (ICDs) shock the heart when it is beating too fast to prevent cardiac arrest. Additionally, some devices have been developed that can do both.