Rather than producing the strong and coordinated contractions needed to move blood through the heart valves and into the ventricles, the atria behave erratically. This can include beating too fast ...

Each side of the heart consists of an atrium and a ventricle which are two connected chambers. The atria (plural of atrium) are where the blood collects when it enters the heart. The ventricles ...

AFib means that the heart’s upper chambers (known as the atria), beat out of synch with the lower chambers (known as the ventricles). When this happens, not all blood gets pumped out of the heart.

node. This co-ordinates the normal sequence of beating of the heart's upper and lower chambers (the atria and ventricles).

Each side of the heart consists of an atrium and a ventricle which are two connected chambers. The atria (plural of atrium) are where the blood collects when it enters the heart. The ventricles ...

Dear Doctors: I am a 47-year-old woman in good health. I exercise regularly and eat a healthy diet. At my physical, I was surprised when my doctor said I have A-fib. I have never felt anything ...