Abstract
Fractional flow reserve (FFR: ratio of pressures distal and proximal to a stenosis), the commonly used diagnostic parameter for functional assessment of coronary stenosis, has a threshold range of 0.75–0.80 below which clinical intervention is recommended. This range is known as a “gray” zone resulting in uncertainty of diagnosis. An alternate diagnostic parameter, pressure drop coefficient (CDP: ratio of trans-stenotic pressure drop to the proximal dynamic pressure), developed based on fundamental fluid dynamics principles, has been suggested by our group. Pressure drop coefficient has a wide range of
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