The rhythm is either sinus rhythm or not sinus rhythm. Sinus rhythm refers to the origination of the electrical activity coming from the sinus node — also known as the sinoatrial node, or SA node.

Most of the time, you don't think about your heartbeat. It works quietly in the background of your day. But sometimes your ...

The death of a loved one is one of the most difficult experiences that many people will go through during their lifetime, but one nurse is trying to make the process a little easier. Felicia Vaughn is ...

In cardiac arrest, the speed and type of treatment can literally mean life or death in the immediate term, but can also affect health outcomes after successful resuscitation. During out-of-hospital ...

ECG Challenge: New Beats With a Pacemaker After receiving a pacemaker, this heart failure patient has changes to his ECG. Are these new rhythms normal?

Sarah Mitroff has worn many hats at CNET, including Senior Mobile Editor and Managing Editor of Health and Wellness. Currently, she is a freelance editor. Throughout her career, she's written about ...

Sometimes, an abnormal EKG reading is a normal variation in a person’s heart rhythm. In other cases, it may be due to an underlying heart condition or a reaction to medication. An electrocardiogram ...