About the video: This PBS medical series explores illnesses one at a time and features a panel of physicians and other experts assessing individual cases. Heart disease is the number one killer in the U.S. With doctors and researchers racing to stop heart disease in its tracks, diagnostic technology and treatment options are breaking new ground at astounding speed. But are there dangers? Can technology tell us too much? Our experts dive into the high-tech world of cardiac care. Check local listings for airdates and times on your local PBS station. For more information visit http://www.pbs.org/secondopinion/