Results of Studying Villas Circle Ring System by the Method of Angiography / Монголын Анагаах Ухаан

ABSTRACT

Background. In the process of infarction, important mechanism of blood supply deficiency is collateral blood supply. There are a lot of various collaterals which are able to supply in the period of necessity of human brain. Collateral which forms in the level of villas circle (ring) in the cranium is the most important front and back artery cord of brain form villas circle (ligament) as a result of these arteries possibility of forming collateral blood supply in the period of blood insufficiency in vertebral and carotis and between magisterial artery of 2 sides of brain opens. It is rare when the system of villas circle (ring) is complete (full), artery cord is narrow (hypoplasia, aplasia) or none, villas circle(ring) loses its complete and it becomes open on the front and at the back part. By the researchers study hypoplasia of artery cord occurs in 20-40% because it branches off from other artery. By Yu.M. Nixitins study vertebral artery of the brain branches off the form the artery into carotis and it open at back part-was 25%, study of system of villas circle (ring) by angiography hasnt been done. Aim. We aimed at the diagnosing villas circle system by angiographic method and studying its incompleteness, form cause, age and sex dependence. Materials and Methods. We studied material of 595 patients who were done angiography of the brain because of acute and chronic deficiency of blood supply of the brain in 2007-2008 at the third clinical hospital by P.N.Shastin in the cabinet of angiography came from clinic, district and Achtan Elit hospital. We clarified magisterial arteries and villas circles in the cranium by the standard method in 2 sides used polydiagnostic 2 digital subtraction equipment of Philips form of Japan. We evaluated artery system, location, form and size and studied age and sex dependence.75% of verographer solution not more than 80-100ml was injected into the artery. Conclusion: 1. Incompleteness of circle revealed in 31.7 % 2. Open case of villas circle in the front part was in 41.5 % 3. Open case of villas circle at the back revealed in 58.4% 4. Studying villas circle, evaluating collateral blood supply is necessary to blood supply deficiency in particular to define blood deficiency insult.