Dr. Hugh Calkins answers the question: 'Atrial Fibrillation vs. Atrial Flutter?' — -- Question: My doctor told me I sometimes have atrial fibrillation and at other times have atrial flutter. What ...

When your electrical system is working normally, the two upper chambers of the heart (atria) contract and pump blood into the two lower chambers (ventricles) in a well-coordinated way. This results in ...

The mitral valve, so named because of its similarity to a bishop’s miter, has five important structural elements: 1) the mitral annulus, 2) the mitral valve leaflets, 3) the commissures, 4) chordae ...

Age, gender, and body size can affect the size of the left atrium, but several medical conditions can also be responsible. The left atrium is one of the four chambers of the heart. It’s located in the ...