A left atrial myxoma is a benign tumor that is relatively ... While it can be located in the right atrium or the ventricles, the most common location for a cardiac myxoma is the left atrium.

The right atrium is roughly round in shape and has an extension known as the right atrial appendage. The sinus node—the part of the heart's electrical system that generates the heartbeat signal ...

An atrial septal defect of the secundum type is relatively common and occurs from failure of the septum secundum to develop. This results in a communication between the left and right atrium ...

When someone has atrial fibrillation, it means the two upper chambers of the heart have ceased to function properly. It occurs due to a malfunction in a cluster of cells in the right atrium ...