[A case report of aortic root replacement with fresh aortic homograft for valve detachment due infective endocarditis].

A 28-year-old male received a redo aortic valve replacement (AVR) with a 19 mm St. Jude Medical mechanical valve 3 months after the initial AVR because of recurrent valve detachment. We re-operated on this patient by aortic root replacement using a fresh aortic homograft. The donor of the homograft was a 59-year-old female who died of a traffic accident. The aortic root and valve was harvested aseptically and stored in a nutrient medium including antibiotics at 4 degrees C for 4 days. At the 3rd operation, aortico-ventricular discontinuity and an annular-abcess-like cavity were found. After debridement, the cavity was closed with a homograft aortic wall and then aortic root replacement was performed using a fresh aortic homograft. At first, prosthetic valve detachment seemed to be caused by infective endocarditis on the basis of his clinical history. However, causative organisms had never been recovered from the blood or the specimens obtained at the time of operation and reoperation. Post-operative HLA examination revealed No. 51 on HLA-B locus and thus we suspected that valve detachment might have been due to inflammation of the aortic wall caused by a subtype of Behçet disease. The early post-operative course was uneventful with a low dose of predonine. Post-operative aortography showed no aortic regurgitation and normal coronary anastomosis. Unfortunately however, he died suddenly 8 months after the operation. Autopsy demonstrated the presence of aortic wall necrosis with massive infiltration of macrophages and leucocytes resulting in dehiscence of the coronary anastomotic site. The cause of homograft detachment could not be determined for sure but might be recurrent infective endocarditis, although causative organisms were never identified, or infective endocarditis in combination with Behçet vasculopathy.