2.Reason is osteochondrosis.

 Reasons for failure blood supply in vertebrobasilar pool as on vertebra arteries are other: these are inborn or received changes in data vessels, and osteochondrosis for neck region  vertebra. And to inborn changes are having tortuosity for vertebra arteries, hypoplasia /small diameter/ of arteries , high  entering arteries. Too  received are tumors, as inside and outside, as not allowing blood transferring in neck vessels. But  neck osteochondrosis is a most popular factor. And disease ties with deformation and destroying for between vertebra disks, displacement for vertebra bones is dr.shares.

 Osteochondrosis is not rare having with protrusion pronucleuses for between vertebra disk in vertebra canal, so as forming hernia. A such hernia in neck region for vertebra is pressing artery and destroy  brain blood circulation .

And in group for risk for neck osteochondrosis are different peoples,  but many are long staying who are, sitting in data pose, keeping muscles of neck and collar zone in tension. 

As workers at office for computer, for long sitting for table, writers, drivers professional, enjoyers hobby by art, knitting, sewing, as with head are entering in hobby, young peoples enjoyers smartphones , gadgets, without mobilities.

 A what is syndrome for vertebra artery?

Is complex for symptoms, which is happening in narrowing for space of vertebra arteries and destroying blood supply in her. AS here are vision displays with a feeling veil, thunder, spots or points before eyes, blind parts in field of vision, vestibular disorders as noises in head, dizziness, not stability feelings, nausea, unsteadlissness, vegetative destroys with  chill feeling, hot, cooling legs, hands, colour skin changing, sleepiness, suddenly rising arterial pressure, heart rhythm destroying and raws for others.

And if a surgery would be.

If doctor found that vessels spasms or theirs closing on 70 perc. Thus  adding surgery, and a few variants for deciding problem:

Carotenoid endo-artherictomia is a method for plaque removing from artery by surgery way ,as scraping.

Angioplastic is space for damages by plaque a vessel, increasing by catheter or balloon, which swelling in a place for damage under high pressure, destroying plaque and pressing plaque in a wall of vessel.

Stenting in a damage place putting  an especial carcass  which leading straightening of part by narrowed vessel. Type of surgery defining individually in depending on from condition by diagnosis stats. And in every method's   having an own indications and contraindications.

By world testing a risk for affecting atherosclerosis of sleepy arteries  are affected livers in West-pacific ocean/South Korea, Japan, Thailand, less are Africans and countries of East Mediterranean as Cyprus , Turkey, Crete, Syria , Israel, as scienists  here describing by a favourable effect  of Mediterranean  diet, are minimized saturated animal fats, but lots of vegetables, fruits, olive oil, seafood, sea products.