A pacemaker is an electric medical device that’s generally about the size of a matchbox. A surgeon implants it under your skin to help manage irregular heartbeats called arrhythmias. Pacemakers can ...

My cardiologist stepped out of the exam room and returned with a medium-sized cardboard box that rattled as she walked. The contents: a few dozen watch-sized, titanium-encased implantable pacemakers ...

In the normal heart, the heart's lower chambers (ventricles) pump in sync with the heart's upper chambers (atria). When a person has heart failure, often the right and left ventricles do not pump ...

In the normal heart, the lower chambers (ventricles) pump at the same time and in sync with the heart's upper chambers (atria). Cardiac resynchronization therapy (CRT), also called biventricular ...

MILLIONS of people around the world benefit from having artificial pacemakers implanted into their chests, to help restore a normal heartbeat. Yet pacemakers are not without problems. The bulk of the ...