Mitral valve stenosis is a narrowing of the mitral valve, often due to rheumatic fever. It causes breathlessness, chest pain, ...

Third degree heart block occurs when the electrical signal from the heart’s atria, or top chambers, cannot reach the ventricles, or bottom chambers. Without treatment, the heart may eventually stop.

The atria and ventricles work together, contracting and relaxing to pump blood out of the heart in a coordinated and rhythmic fashion. As blood leaves each chamber of the heart, it passes through ...

The atrial septum separates the left and right atria, while the ventricular septum separates the left and right ventricles. The heart’s septum is critical for ensuring that blood flows properly ...

The heart is a muscular organ composed of four chambers: two upper chambers called atria and two lower chambers called ventricles. These four chambers pump blood through the body in a rhythmic pattern ...

The heart has four chambers: atria on the top and ventricles on the bottom. Blood flows from the veins into the right atrium, passing through the tricuspid valve into the right ventricle, which ...

The heart has four chambers: two atria above and two ventricles below. The two atria, left and right, are separated by a muscular partition, the septum. A gap in this septum is called an atrial ...

Two recent research studies have found differences between the distribution of potassium-ion-channel variants in the mouse heart and in the human heart. In the mouse, the ion channels in the atria ...

Second-degree heart block is a condition in which the impulses from the atria occasionally fail to reach the ventricles. Heart blocks may also be called atrioventricular (AV) blocks.

Retrospective analyses support this hypothesis by linking an increased frequency of right ventricular paced beats to increased risks of atrial fibrillation and heart failure in patients with sinus ...

The right atrium and right ventricle work together to receive the blood that has just traveled throughout the body and move it into the lungs. There, it gets topped off with oxygen.

Atrium. A tumor in an upper heart chamber can block blood flow into the lower chambers ... It means the atria and ventricles each set their own pace instead of working together.