Add Yahoo as a preferred source to see more of our stories on Google. Electrocardiograms, or ECGs, record the electrical activity of your heart. Randy Faris/The Image Bank via Getty Images Your ...

If you recently got a pacemaker due to an arrhythmia (an irregular heartbeat), heart failure, or bradycardia (a heart that beats too slowly), you might have concerns about getting back into exercise.

Pacemakers are vital, life-saving technology held back by their limited battery life, but the solution to that problem may ...

MIT engineers have developed a noninvasive pacemaker that stimulates the heart using ultrasound. The design could one day ...

Imagine a heart patient with a pacemaker—one of the millions who rely on these tiny, implanted devices to keep their hearts beating steadily. While pacemakers save lives every day, their ability to ...

A pacemaker is a small, battery-powered device that controls the heartbeat. Our heartbeats are controlled by a highly efficient, biological electrical system that ensures our heart steadily pumps ...

The tiny pacemaker sits next to a single grain of rice on a fingertip. The device is so small that it can be non-invasively injected into the body via a syringe. Northwestern University engineers have ...

The heart may be small, but its rhythm powers life. When something throws that rhythm off—especially after surgery—it can become a race against time to restore balance. For decades, doctors have ...

Your heart's job is to keep your pulse steady to pump blood throughout your body. Sometimes your heart rate is slower when you're relaxing, and sometimes it's faster when you're exercising or stressed ...