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Figure 1: Antegrade cardiac catheterization from the inferior vena cava to superior vena cava to VV to pulmonary venous confluence showing constriction at the VV (marked by arrow). VV: Vertical vein, PVC: Pulmonary venous confluence

Figure 1: Antegrade cardiac catheterization from the inferior vena cava to superior vena cava to VV to pulmonary venous confluence showing constriction at the VV (marked by arrow). VV: Vertical vein, PVC: Pulmonary venous confluence