This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page. Embed Code Restart Playing WATCH MORE VIDEOS FROM THIS EPISODE > An irregular heartbeat can lead to serious health problems. Dr. Freda Lewis-Hall, Chief Medical Officer of Pfizer, and E.R. physician Dr. Travis Stork have a heart-to-heart discussion about atrial fibrillation. ShareTweet
