[Recurrent ejection of aortic valve prostheses. Apropos of 22 case reports].

Twenty two cases of recurrent perivalvular leaks in aortic valve prostheses were reviewed in a multicentre cooperative study. From 1963 to 1978, 22 patients, mean age 39 years, underwent aortic valve replacement; 18 patients had aortic regurgitation, 6 due to infective endocarditis, and 4 patients had calcific aortic stenosis. Eight Starr-Edwards, 6 Smeloff-Cutter, 2 Braunwald-Cutter, 3 Björk, 1 Lillehei-Kaster and 2 bioprostheses were inserted. All 22 patients had to be reoperated for perivalvular leaks due to active or previous infective endocarditis in 7 cases. The prostheses implanted (3 reinsertions, 19 valve replacements) were 10 Starr-Edwards, 4 Smeloff-Cutter, 5 Björk, 1 Lillehei-Kaster, 1 Magovern and 1 bioprosthesis. All 22 patients had further perivalvular leaks, 6 caused by infective endocarditis, and 15 patients underwent a third operation. The prostheses implanted this time (2 reinsertions, 13 valve replacements) were 4 Starr-Edwards, 3 Smeloff-Cutter, 7 Björk and 1 bioprosthesis. Four patients had a third perivalvular leak, and 2 patients a fourth perivalvular leak. The first and second episodes of perivalvular leak were detected early in over half the cases. They were associated with cardiac failure, angina and hemolysis in 20 to 45% of cases. The average period between the first and second operations, and the 2nd and 3rd operations were 15 months and 9 months respectively. Overall, 11 patients died (50%), 4 due to cardiac failure and 3 of sudden death; 3 patients have been lost to follow-up (14%), and there are 8 survivors (36%) with a mean follow-up period of 5 years. However, the mortality rate when the cause of perivalvular leak was infective, was 82%, and only 18% when the cause was mechanical. The factors which favour recurrent perivalvular leaks are infection (30% of cases) and technical difficulties related to the poor quality of the aortic ring (calcification, dystrophy or dilatation). The prevention of this complication depends on careful peroperative technique, the use of certain surgical bypass techniques, a constant battle against infection, and regular examination of operated patients.