The pericardium is a double-walled sac around the heart. The inner and outer (visceral and parietal, respectively) layers are normally lubricated by a small amount of<unk>  fluid, but the inflammation of pericardium causes the walls to<unk>  against each other with audible<unk> . In children, rheumatic fever is often the cause of<unk> .<unk> s can also be heard in pericarditis that is associated with uremia or post-myocardial infarction.
Pericardial friction rub
Pulsus alternans
Pulsus paradoxus
Pulsus bigeminus
Hyperdynamic precordium
Heart click
Sail sign of the chest
Carey Coombs murmur