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.
Top 10 Doctor insights on: What Does Trace Mitral Regurgitation Mean. 1 What does trace mitral regurgitation mean? VERY MILD valve leak: Trace means 'very mild' and mitral valve regurgitation means 'leak'. It happens when your mitral valve doesn't close tightly, which allows blood to flow backward in your heart. When the 'leak' is moderate-severe you may develop symptoms of tiredness & fatigue.