<prompt> The severity of mitral regurgitation is decided by all of the following clinical findings except:Presence of mid- diastolic murmur across mitral valve.Wide split second heart sound.Presence of left ventricular S3 gallop.Intensity of systolic murmur across mitral valve  <response>: Ans. is d i.e. intensity of systolic murmur across mitral valve There is little correlation between intensity of systolic murmur and severity of MR. - BraunwaldFollowing features suggest severe mitral regurgitation.Following features suggest severe mitral regurgitationWide splitting of S2A low pitched S3Soft SIMid-diastolic murmur across mitral valve.Presence of pulmonary arterial hypertension.For option aBraunwald states A short low pitched diastolic murmur following S3 may be audible in patients with severe MR, even without an accompanying MS.Lets see the pathophysiology of Mitral Regurgitation 