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Figure 2 Fractional Flow Reserve
A schematic cartoon demonstrating the concept and derivation of fractional flow reserve (FFR). FFR = (Pd – Pv)/(Pa – Pv). The central venous pressure approaches 0; therefore, Pv is negligible and FFR = Pd/Pa. Pa = mean proximal coronary artery pressure; Pd = mean coronary artery pressure distal to the lesion; Pv = mean central venous pressure.
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