Quick answer: "B-lines" in hand veins refers to ultrasound findings - specifically vertical hyperechoic artifacts arising from the pleural line (in lung ultrasound), but in the context of hand/peripheral veins it likely refers to venous anatomy or ultrasound-guided IV access findings. Could also relate to venous assessment for vascular access. Let me search the library for clarity.

I see the search results point to lung ultrasound B-lines broadly. The query "bilateral B line hand veins" is a bit ambiguous - it could refer to:

Let me search more specifically in the textbook library for Kerley B lines and hand vein distension as signs, and also look at what's in the nephrology/cardiology texts about peripheral venous congestion signs.

The query "bilateral B line hand veins" is genuinely ambiguous. Based on my search, I need to clarify the clinical context before giving a precise answer.