Mitral regurgitation (MR) is the term used for (abnormal) systolic retrograde flow of blood from the left ventricle to the left atrium (LA). MR occurs either due to disease involving the mitral ...

The murmur produced by an atrial septal defect is due to increased flow ... a mid-systolic click usually followed by a uniform, high-pitched murmur. The murmur is actually due to mitral ...