MMP9 and Patent foramen ovale: The levels of angiogenin, angiotensinogen, CRP, IgG, IL‐1β, IL‐6, kallikrein 5, LOX‐1, MIP‐1α, MMP‐2, MMP‐9, PAI‐I, renin, S100b, Tau, TNF‐α, t‐PA, VEGF‐a, and VE‐cadherin in arterial blood did not change significantly after PFO closure (Figure 3D and Table 4).