In a healthy heart, blood flows in only one direction. The four valves of the heart prevent blood from flowing backward. But a leaky heart valve, or heart valve regurgitation, causes a backflow of ...

Researchers have discovered that a certain type of cell that sits on top of the brain's smallest blood vessels senses when their brain region needs energy. When glucose levels are low, these cells ...

Three types of surgery can remove or reduce an arteriovenous malformation, a tangle of blood vessels that impede blood flow. An arteriovenous malformation (AVM) is a rare, noncancerous entanglement of ...

Risk assessment Researchers from Caltech and the Keck School of Medicine at USC have created a portable laser-based headset that can estimate stroke risk. Caltech postdoctoral scholar Simon Mahler is ...

Blood clots that occur within veins or arteries can cause serious health problems. Certain exercises and stretches can help prevent blood clots. Blood clots typically affect veins in the arms, legs, ...

Suzana Herculano-Houzel does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations ...

Blood clots can happen to anyone. The likelihood that a blood clot will develop increases if you’ve had an injury to a vein, have reduced blood flow due to limited movement, have had recent major ...