Fractional flow reserve (FFR) represents the ratio of hyperemic flow in the presence of an epicardial stenosis to hyperemic flow in the hypothetical absence of this stenosis. FFR can be calculated… Click to show full abstract
Fractional flow reserve (FFR) represents the ratio of hyperemic flow in the presence of an epicardial stenosis to hyperemic flow in the hypothetical absence of this stenosis. FFR can be calculated from hyperemic pressure measurements, provided the relationship between flow and pressure during
               
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