hello mr,murmer can be heard extrenially by stethoscope&some murmers can be felt too(thril). since,they told that,you are having murmer,which means somthing must be abnormal while rush of blood from ventricles to atrium,may be left , or right side.mid diastolic murmer is audiabel in mitral valve defect,which is most common. get done echocardiogram
,so that you vl come to presiesly,wheather mitral valve defect or aortic vale or pulmonary valve defect
in left side of heart(pure blood).associated symptoms like breathlenss,cyanosis
,variation on pulse wave,felt peripherally in radial artery(wrist joint region) might have made possibility of mitral valve defect but not final diagnosis.ok consult cardiologist
to avoide confusion.all the best.