Figure 4From: Comparison of the novel Medtentia double helix mitral annuloplasty system with the Carpentier-Edwards Physio annuloplasty ring: morphological and functional long-term outcome in a mitral valve insufficiency sheep model Microscopic findings in reference annuloplasty rings (left panel, a, c, e; and Medtentia annuloplasty ring (right panel, b, d, f). a & b: H&E histology of the newly formed endocardial tissue. Note the significantly thicker layer in the reference sample (bar = 500 μm) than in the Medtentia annuloplasty ring (bar = 200 μm). c &d: anti-Factor VIII staining reveals a functional endothelium on the surface (arrowheads) and some subendocardial vessels (arrows). e &f: anti PCNA stains show the fraction of mitotic and postmitotic cells with brownish nuclei. Bars in b-f = 200 μm.Back to article page