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FIG 3. Dynamic profile of flow turbulence associated with different degrees of arterial stenosis. The transition of flow turbulence did not occur until the degree of stenosis of the artery increased to 55%. At stenoses of 66% and 75%, turbulence became most typical and was accompanied by reversed flow. Turbulence remained but decreased when degree of stenosis increased to 85% or 90%. Both systolic and diastolic velocities increased in association with the rising degree of stenosis, but systolic velocities changed more predominately.
