Rows represent cohort groups (from top; controls, HFrEF, HFpEF and PVOD). Columns represent nature of venous intimal remodeling (from left; dense fibrosis, loose fibrosis and intimal hyalinosis). In Controls: A (ED 152 μm), B (ED 183 μm) and C (ED 119 μm). In HFrEF: D (ED 275 μm), E (ED 98μm) and F (ED 162 μm). In HFpEF: G (ED 347 μm), H (ED 118 μm) and I (ED 125 μm). In PVOD: J (ED 206 μm), K (ED 60 μm) and L (ED 93 μm).