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 ...

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 ...

Depending on the degree of the sinoatrial block, the electrical impulses may or may not move from the atria and reach the ventricles. Individuals affected by a sinoatrial block are asymptomatic ...

Common signs of Wenckebach heart block are feeling dizzy, tired, and having a fast heartbeat. These signs can be hard to ...