New findings reveal a potential connection between serotonin activity and the progression of a widespread heart valve ...

THE human aortic valve consists of three cusps made of relatively inelastic, muscle-free material about 0.15 mm thick. It opens and shuts about once a second, and withstands a pressure difference of ...

Pulmonic regurgitation is when blood leaks back into the heart from the pulmonary artery due to weakness in the pulmonary valve. It happens when a pulmonary valve does not close properly. The ...

(a) A sketch of the spin-valve effect in bulk kagome helimagnet. (b) MFM images of TmMn6Sn6 under magnetic field. (c) The asymmetric magnetoresistance for electric current along the helical axis of ...

Traditionally, the Ahmed glaucoma valve is used in more complicated cases after other surgical measures have been tried. Increasingly, however, the Ahmed glaucoma valve is being considered as a ...

Variable valve timing (VVT) and variable valve lift (VVL) have very similar names, both referring to variable valve performance. Does that mean that they are basically the same thing? The are most ...

Boston Scientific Corp. said it was recalling its previous generation Lotus heart valve replacement devices following reports of problems with the products' locking mechanisms. The Marlborough, ...