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Ultrasound says that the brachial artery has normal triphasic flow but also indicates collateral distal flow. What is collateral distal flow? Bad?

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In brief: Flow around blockage

Distal collateral arterial flow would imply that an arterial branch of the brachial artery such as the ulnar or radial artery is blocked or narrowed.
When this happens, small branching arteries that can bridge the blocked segment enlarge to get some blood beyond the blockage. These collateral branches maintain viability and some function of the areas affected by the main blockage.

In brief: Flow around blockage

Distal collateral arterial flow would imply that an arterial branch of the brachial artery such as the ulnar or radial artery is blocked or narrowed.
When this happens, small branching arteries that can bridge the blocked segment enlarge to get some blood beyond the blockage. These collateral branches maintain viability and some function of the areas affected by the main blockage.
Dr. Bruce J. Stringer
Dr. Bruce J. Stringer
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