RT Journal Article SR Electronic T1 Post-mortem shrinkage of homograft aortic valves JF Thorax JO Thorax FD BMJ Publishing Group Ltd and British Thoracic Society SP 312 OP 314 DO 10.1136/thx.27.3.312 VO 27 IS 3 A1 Dexter, F. A1 Donnelly, R. J. A1 Deverall, P. B. A1 Watson, D. A. YR 1972 UL http://thorax.bmj.com/content/27/3/312.abstract AB Experience has shown that some frame-mounted homograft aortic valves, although competent immediately after mounting, are incompetent when subsequently presented for surgical use. Retraction and shrinkage of the cusps appears to be the cause of this change. Clinical and experimental studies have shown that shrinkage of homograft aortic valves occurs over an approximately five-day period after death of the donor and it is recommended that this period should elapse before mounting homograft aortic valves on to support frames.