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 valve regurgitation is a condition where the oxygenated blood flows backwards into the lungs as opposed to flowing through. 1  Patients have angina arrhythmia and shortness of breath. 2  Narrowed valve is one more reason for valve replacement in cases like aortic stenosis or mitral stenosis.