Monthly Archives: April 2016


What is Atrial Fibrillation?

By |April 29th, 2016|

This is a file from Wikimedia Commons

The human heart has two upper chambers and two lower chambers. The upper chambers are called the left atrium and the right atrium – the plural of atrium is atria. The two lower chambers are the the left ventricle and the right ventricle. When the two upper chambers