An angiogram of a 48-year- old patient after treatment for a stroke. A blockage was targeted with clot-busting drugs using a catheter. Zephyr/Science Source hide caption

itoggle caption Zephyr/Science Source

Maribel Ramos, 13, has both sickle cell disease and an abnormality of blood vessels called moyamoya. Both put her at risk of stroke, and, together, they add up to a 95 percent chance of a major stroke. Richard Knox/NPR hide caption

itoggle caption Richard Knox/NPR

Before filling one of these tubes with blood for a cholesterol test, you're supposed to keep your stomach empty. But that may not be necessary. Nancy Louie/iStockphoto.com hide caption

itoggle caption Nancy Louie/iStockphoto.com

This gentleman may want to have a chat with his cardiologist. Bill Losh/Getty Creative Images hide caption

itoggle caption Bill Losh/Getty Creative Images

Members of the online community Track Your Plaque get advice from a doctor and each other on how to cook low carb meals. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Pedometer, an app, keeps track of your steps, distance traveled and calories burned. Benjamin Morris/NPR hide caption

itoggle caption Benjamin Morris/NPR

Hugo Campos' implantable cardioverter-defibrillator was a mystery to him. So he decided to ask his doctor for access to the data. He made this image with one of his own X-rays. Hugo Campos hide caption

itoggle caption Hugo Campos