Figure 2From: Ratio of preoperative atrial natriuretic peptide to brain natriuretic peptide predicts the outcome of the maze procedure in mitral valve disease Representative sections stained with 0.1% Sirius red and 0.1% Fast green in the left atrium (A, E), left atrial appendage (B, F), right atrium (C, G) and right atrial appendage (D, H) of patients with mild left atrial fibrosis (upper panel) and severe left atrial fibrosis (lower panel). Scale bar=200 μm.Back to article page