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.
Secondary regurgitation means another heart problem causes the valve to not close tightly. The anatomy of the valve is typically normal. The heart problem, such as heart failure, affects the heart muscle, and this causes regurgitation. Acute mitral valve regurgitation develops quickly and can be life