title: Bacterial endocarditis following aortic valve replacement. Clinical and pathologic correlations.
abstract: The clinical and pathologic findings in three patients with bacterial infection at the sites of prosthetic aortic valves are described. Each presented typical clinical features of acute bacterial endocarditis followed by the sudden development of severe and ultimately fatal aortic regurgitation. Pathologically the infectious process was characterized by extensive necrosis of the aortic annulus, disruption of the aortic wall, and the formation of abscesses in the periaortic tissues. In two patients the prosthetic valve was partially detached from the annulus, whereas in the other it was totally dislodged and impacted in the aortic arch shortly before death. In all, secondary operative intervention would have been fruitless because of the extent of the infection and the character of the tissue at the aortic root. In one patient fatal staphylococcal endocarditis followed dental extractions despite penicillin prophylaxis. A more comprehensive antibiotic regimen for patients with prosthetic cardiac valves is suggested.
authors.affiliation: Clinic of Surgery, National Heart Institute, Diagnostic X-ray Department, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA.
authors.forename: L H
authors.initials: LH
authors.lastname: Cohn
authors.forename: W C
authors.initials: WC
authors.lastname: Roberts
authors.forename: D S
authors.initials: DS
authors.lastname: Rockoff
authors.forename: A G
authors.initials: AG
authors.lastname: Morrow
mesh_terms: D001021:Aortic Valve / Q000473:pathology / Q000601:surgery*; D004697:Endocarditis, Bacterial / Q000209:etiology* / Q000473:pathology; D019918:Heart Valve Prosthesis Implantation / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000473:pathology