In evaluating an open foot wound, which diagnostic study assesses blood flow or occlusions?

• A. Vascular ultrasound
• B. MRI with contrast
• C. CT angiography
• D. X-ray

Answer: (A)

Assessing perfusion in a foot wound relies on imaging that can visualize vessels and measure blood flow. Duplex vascular ultrasound uses ultrasound with Doppler to see the peripheral arteries and evaluate how well blood is moving through them. It can identify occlusions or significant narrowing, show whether distal runoff exists, and provide flow velocity patterns that help determine if ischemia could impair healing. It’s fast, noninvasive, can be done at the bedside, and doesn’t require contrast or radiation, which is especially helpful in a wound where healing depends on adequate blood supply. Other imaging options visualize vessels but involve contrast or radiation or don’t directly assess flow—MRI with contrast and CT angiography carry contrast-related or radiation risks, and X-ray does not assess blood flow at all.