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Figure 3 Frequency distribution (expressed as percentage of entire population) of pressure- and Doppler flow velocity-derived collateral flow index (CFI) (no unit) in 450 patients with coronary artery disease. Sixty-eight percent of the patients had a CFI <0.25 (white-spotted columns), indicating collateral flow insufficient to protect the myocardium from ischemia during coronary occlusion. Patients with a CFI  0.25 are indicated by the solid black columns.
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