<prompt> True in mitral regurgitation MR isPansystolic murmur at the apexLoud S1Functional or Secondary MR is caused by papillary muscle rupture after myocardial infarctionECG commonly reveals P pulmonale  <response>: S1 is soft in MR unlike MS. Functional or Secondary MR is caused by dilation of the left ventricle causing leakage at the mitral annulus. ECG in MR shows P mitrale due to dilation of the Left atrium. 