Most common manifestation of cardiac lupus is-

the most common manifestation of cardiac lupus is pericardial inflammation or pericarditis Pericarditis. Pericarditis is the most common hea problem associated with active lupus and occurs in about 25% of people with SLE. The condition occurs when the pericardium--the thin membrane surrounding your hea--becomes swollen and irritated, causing it to leak fluid around the hea. Ref Davidson 23rd edtion pg 470