The semilunar valves stop the back flow of blood into the heart. There is a semilunar valve where the aorta leaves the left ventricle and another where the pulmonary artery leaves the right ventricle.

If you clench your hand into a fist, this is approximately the same size as your heart. It is located in the middle of the chest and slightly towards the left. The heart is a large muscular pump ...

FAPI PET—can detect the first signs of tissue remodeling in patients with pulmonary arterial hypertension (PAH), providing physicians with an early marker for disease progression. This approach has ...