<prompt> True about third hea sound H3-Heard in MRSystolic soundHigh pitch soundNormal in adults  <response>: s3 is heard in MRMitral regurgitation it is a diastolic sound,low pitched sound and pathological in adults The third hea sound S3, also known as the ventricular gallop, occurs just after S2 when the mitral valve opens, allowing passive filling of the left ventricle.CLINICAL PEARL: A S3 hea sound is often a sign of systolic hea failure, however it may sometimes be a normal finding. Ref Harrison 20th edition pg 1435 