Atrial fibrillation is a serious heart condition that affects millions of Americans, including Howie Mandel. Listen in for Mandel's story and his advice for those who may be at risk. Comedian and TV personality, Howie Mandel, is used to making people laugh. However, in this segment he joins Dr. Roizen to talk about a more serious issue -- a heart condition that affects millions of Americans, including him. It's called atrial fibrillation, or AFib for short, and it raises the risk of blood clots and stroke, even when you don't have any symptoms. Listen in as Mandel discusses how he was diagnosed, his role in an awareness campaign called "Fibs or Facts," and his advice for people who may be at high risk. Bonus!3 Steps to Start Rekindling a Relationship