Atherosclerosis
A disease process that leads to the buildup of a waxy substance, called plaque, inside blood vessels.
Disorder
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.
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.