Institute of Medicine in the US Recommends Research To Determine Which Health Care Approaches Work Best

"Health care decisions too often area matter of guesswork because we lack good evidence to inform them," said committee co-chair Harold C. Sox, editor, Annals of Internal Medicine, American College of Physicians of Internal Medicine, Philadelphia.  "For example, we spend a great deal on diagnostic tests for coronary heart disease in this country, but we lack sufficient evidence to determine which test is best." Here's the link.
Relating to the arteries supplying the heart itself. Full medical glossary