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 ...

In a normal heart the impulse originates in the SA node, whereas in atrial fibrillation, many electrical impulses are fired at a rapid rate randomly throughout the atria down to the ventricles.

Bradycardia occurs if impulses are sent from the SA node at a decreased rate or if their conduction is delayed. Usually, a decline in heart rate to below 50 or 60 bpm is termed bradycardia. Types ...

Bradycardia is a condition characterized by a slower than normal heart rate. While a normal adult heart beats between 60 and ...

The SA node is composed of specialised pacemaker cells, which send out an electrical impulse throughout the cardiomyocytes (cardiac cells), ensuring the heart beats properly. But the SA node can ...

The electrical signals that orchestrate each heartbeat work this way. A small group of cells called the sinoatrial (SA) node generates an electrical impulse.

When the electrical impulses produced by the sinus node are disturbed, the heart beats at a slower rate than normal (this is called bradycardia). This can cause problems such as faints, falls, ...