It completely depends on where the obstruction is and the chronicity of it. If there is a chronic clot and little to no flow the vein will eventually become atretic. It can also becoming smaller from luminal thickening due to chronic non occlusive clot.
An obstruction at or close to its emptying point and an unchanged vein structure and flow would result in a larger vein.
Regardless, my point was not a small vein is a concern for obstruction of some kind. It was simply if the vein is small but has flow and does not appear to have an obstruction in it then I would cannulate as usual.
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