Comparison of atrial fibrosis between AF and SR subjects.

<p><b>A</b>, Masson-Trichrome staining sections showing the distribution of fibrosis in AF. <b>B</b>, Masson-Trichrome staining sections showing the distribution of fibrosis in SR. <b>C</b>, Percentage of fibrotic tissues quantified based on the Masson-Trichrome staining using Image-ProPlus. Note that the proportion of fibrosis was considerably greater in AF subjects than in SR subjects. SR, sinus rhythm; AF, atrial fibrillation. * P<0.001 vs. SR; n = 10. Scale bar = 100 µm. Magnification: ×200.