from 1972 to 1980 , 23 patients ( group a ) with native valve infective endocarditis underwent surgical intervention , often for multiple indications , during the active stage of the infective process because of progressive class iii and iv ( new york heart association ) heart failure ( 12 patients ) , persistent severe hypotension ( 3 patients ) , uncontrolled infection for over 21 days ( 11 patients ) , aortic root abscess ( 2 patients ) , and pericarditis ( 1 patient ) .
C0018787
heart
C0031046
pericarditis