You are most likely to observe a color bruit in which case?

You are most likely to observe a color bruit in which case?

• A. Trickle flow within a small residual lumen
• B. Damped flow proximal to a high-grade stenosis
• C. Chronic vessel occlusion
• D. Turbulent flow distal to a high-grade stenosis

Answer: (D)

Color bruit on Doppler imaging reflects turbulent blood flow. This turbulence is most likely when a high-grade stenosis creates a high-velocity jet that exits the narrowed segment and breaks into chaotic, swirling motion downstream. The downstream region shows mosaic color signals as eddies form, which corresponds to the audible bruit heard clinically. In contrast, flow within a small residual lumen tends to be slow and laminar, pre-stenotic flow is damped but not turbulent, and chronic occlusion often leaves little to no forward flow. So the scenario with turbulent flow distal to a high-grade stenosis is the one most likely to produce a color bruit.

Color bruit on Doppler imaging reflects turbulent blood flow. This turbulence is most likely when a high-grade stenosis creates a high-velocity jet that exits the narrowed segment and breaks into chaotic, swirling motion downstream. The downstream region shows mosaic color signals as eddies form, which corresponds to the audible bruit heard clinically. In contrast, flow within a small residual lumen tends to be slow and laminar, pre-stenotic flow is damped but not turbulent, and chronic occlusion often leaves little to no forward flow. So the scenario with turbulent flow distal to a high-grade stenosis is the one most likely to produce a color bruit.