Though an estimated 60 million people around the world have atrial fibrillation, or A-fib, a type of irregular and often fast ...

You may have heard the phrase "my heart skipped a beat" when someone was talking about a romantic encounter. In truth, hearts that beat irregularly are dangerous for your health. Atrial fibrillation ...

The pink, white and red blob of tissue quivers in a vat of clear goop about the size of a kitchen sink. Graduate students whiz around this slimy beating heart and crawl under the tubes connected to ...