Atrial Flutter
A type of arrhythmia in which the upper chambers of the heart (the atria) beat very fast, causing the walls of the lower chambers (the ventricles) to beat inefficiently as well
Disorder
Atrial Fibrillation [AF]
This is a common abnormal heart rhythm that happens when electrical impulses fire off from different places in the atria (the top chambers of the heart) in a disorganised way. This causes the atria to twitch, and results in an irregular heartbeat or pulse. Atrial fibrillation is a major cause of stroke.
Atresia
Complete obstruction to a valve or blood vessel, so that blood cannot get past this point in the circulation and has to take an alternative route.