S1 and S2 are the normal heart sounds you hear when the heart valves close. Heart murmurs are extra sounds that can be heard during systole, diastole, or as a continuous sound. S3 and S4 are abnormal ...

Bacterial endocarditis, or infective endocarditis, is a rare infection of the heart lining and valves. It is caused by a bacterial infection and results in flu-like symptoms. The condition may become ...