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

What Is a Normal Sinus Rhythm? Normal sinus rhythm is when your heart beats in a regular, organized way. Your body has a built-in pacemaker called the sinoatrial (SA) node, or sinus node. It uses ...

Compared with immediate defibrillation, the 2005 American Heart Association cardiac arrest resuscitation guidelines recommended that 2 minutes of cardiopulmonary resuscitation (CPR) before the first ...

An arrhythmia is an atypical heartbeat that is either much faster or slower than expected. Your heartbeat may be described as chaotic, rather than steady and predictable. There are several types of ...

Heart palpitations – a sensation that your heart is pounding or racing – are a common reason people seek medical care. But just because palpitations aren’t unusual doesn’t make them simple. “There are ...