The SI unit for pressure is the pascal (Pa), equal to one newton per square metre (N/m 2 or kgÂ·m â1 Â·s â2). This name for the unit was added in 1971; before that, pressure in SI was expressed simply in newtons per square metre.
A leaking mitral valve allows blood to flow in two directions during the contraction. Some blood flows from the ventricle through the aortic valve â as it should â and some blood flows back into the atrium. A leaking (or regurgitant) aortic valve allows blood to flow in two directions.
Mitral regurgitation may also require a valve replacement. In this condition, the mitral valve allows oxygenated blood to flow backwards into the lungs instead of continuing through the heart as it should. People with this condition may experience shortness of breath, irregular heartbeats and chest pain.