Is the origin level of right vertebral artery branch from the right subclavian artery the risk for vertebral artery stenosis?
There are well known variations (normal variants) between the two vertebral arteries with either mild stenosis up to hyperplasia of one of them compared to the other
In some studies such variabilities reaches 25%.
This resembles the variations in the circle of Willis itself being not circular all the time.
Short answer is yes.
In general, branching points of vasculature demonstrate alterations in flow hemodynamics and therefore are prone to developing atherosclerotic changes and narrowing. In the head and neck, the most vulnerable sites are the carotid bifurcations and carotid siphons, but similar elevation in risks are seen at other places as well, including the origins of the vertebral arteries.
See Article The role of blood flow in determining the sites of atheroscl...
and https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4188259/
Can we call the bifurcation where the vertebral artery emerges? I don't think so...
I agree that each vessel has a branching point, so how important is the outlet angle of the vertebral artery from the subclavian artery?
How far origin of vertebral artery from the beginning of the subclavian artery is important for the stenosis?
Is there a study you know about it, please?
Nihat Şengeze Check out this article published in JAMA: https://jamanetwork.com/journals/jama/article-abstract/338339
In an angiographic study of 4748 patients with ischaemic stroke, some degree of proximal extracranial vertebral artery stenosis was seen in 18% of cases on the right and 22.3% on the left. This was the second most common site of stenosis after internal carotid artery stenosis at the carotid bifurcation. Such stenotic lesions are now potentially treatable by endovascular techniques.
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