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 ...

Valvular atrial fibrillation (A-fib) involves a condition that leads to an irregular or abnormal heart rhythm. This can increase a person’s risk of cardiovascular complications, such as stroke.

Running has so many health benefits, it’s counterintuitive to consider any negative effects endurance training may have on the body. However, research suggests that some runners may be at higher risk ...

A few years ago I was out walk­ing with an older relative when she suddenly stopped and put her hands out for support. Her heart­beat had gone haywire, causing chest pains and making her feel ...