As has happened with you, not everyone with A-fib develops symptoms. Symptoms can include a fast and irregular pulse, a fluttery sensation in the chest, general fatigue, unusual fatigue when ...

Medically reviewed by Jeffrey S. Lander, MD The first heart sound, or S1, is the "lub" of a normal heartbeat. It's a ...

Medically reviewed by Rafle Fernandez, MD A third heart sound, or S3, is a low-frequency, extra heart sound that may be heard ...

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.