Annotation. The ischemic-reperfusion lesion, which occurs during the restoration of the arterial circulation, causes structural and spatial reorganization of the arterial bed of the hind limbs of the rats. Recently, more and more attention has been paid to the treatment and prevention of the ischemic changes are given to the nootopic medicines, among which carbacetam stands out. The aim of the study – to establish the manifestations of the structural-spatial remodeling of the arterial bed of the hind limbs of the rats in the femoral, popliteal and tibial anatomical areas during ischemia-reperfusion and under conditions of the correction with carbacetam. An X-ray examination was performed of the arterial bed of the hind limbs of 30 rats under conditions of the ischemia-reperfusion (group I) and 30 rats in the simulation of the ischemia-reperfusion, which were injected carbacetam once a day (5 mg/kg) during 14 days in postischemic period. There were 6 intact animals in the control group. Simulation of the ischemia was performed by applying SWAT rubber tourniquets on the hind limbs for 2 hours, and reperfusion by removal of the arterial tourniquet. The animals of the experimental groups were divided into 5 subgroups with reperfusion terms after 1, 2 hours and 1 day, as well as after 7 and 14 days. The filling of the arterial bed with a suspension of lead sulfide and the radiography were performed. Research morphometric parameters were calculated using the SEO Image Lab software of Sumy Electron Optics. The diameters of the main column (D0,), thicker (D1,) and thinner (D2,) subsidiary branches were determined, and the asymmetry coefficient (H2) was calculated. Statistical processing of the material was carried out using a program package “Microsoft Exсel”. Research results and their discussion. Visual analysis revealed dilatation of the main vascular columns and reduction of angioarchitectonics of the limb, most likely after 1 day, which was confirmed morphometrically. In particular, in the femoral region by 15.77 % (p<0.005) increased (D0) by 12.77 % (p<0.05) – (D1) and by 20.93 % (p<0.005) – (D2). and the asymmetry coefficient (H2) increased by 9.36 % (p<0.05). In the popliteal area at the end of 1 day there was an increase in the lumen of D0 by 18.49 % (p<0.005) and its subsidiary branches D1 and D2 by 15.8 % (p<0.05) and 25.12 % (p<0.05), respectively. The value of H2 increased in this group by 10.56 % (p<0.005). In the area of the tibia during this period there was an increase in the indicator (D0) by 19.54 % (p<0.05), and indicators D1 and D2 – by 12.58 % (p>0.05) and 23.51 % (p<0.05), respectively, and the asymmetry coefficient (H2) – increased by 11.78 % (p<0.05). After 14 days after the resumption of blood supply, the morphometric parameters of the arterial tees decreased and approached the level of the values of the control group. On the X-ray angiograms of the animals with using a correction, an also have signs of the vascular dilatation, but their intensity was less relative to the group, in which correcting was not performed. Thus, in the area of the femoral artery through 1 day of reperfusion marked on decreasing in D0 by 4.0 % (p<0.005), D1 by 2.0 % (p<0.005), D2 by 3.96 % (p<0.005), and H2 by 2.51 % (p<0.005) in the group with correction compared to similar indicators without correction. On the X-ray angiograms of the animals with using a correction, an also have signs of the vascular dilatation, but their intensity was less relative to the group, in which correcting was not performed. Thus, in the area of the femoral artery through 1 day of reperfusion marked on decreasing in D0 by 4.0 % (p<0.005), D1 by 2.0 % (p<0.005), D2 by 3,96 % (p<0.005), and H2 by 2.51 % (p<0.005) in the group with correction compared to similar indicators of the group without correction. At the levels of the popliteal artery, after the application of the correction, the index D0 was lower by 3.0 % (p<0.005), D1 by 2.02 % (p<0.005), D2 by 4.0 % (p<0.005), and H2 by 2.58 % (p<0.005) compared with a group of the animals without correction. In the tibia using of carbacetam caused a decrease in the values of D0 by 3.0 %, D1 by 3.0 % (p<0.005), D2 and H2 by 4.36 % (p<0.005) and 3.83 % (p<0.005) in accordance. Thus, simulated ischemia-reperfusion supplementation with morfo-functional reorganization of the arteries of the hind limbs of the rats at all studied levels after 1 hour of the reperfusion and reaching the highest values after 1 day. Gradually, returning of the studied indicators to the control group occurs after 14 days of the experiment, and the application of correction helps to return the basic parameters of vascular tees at all levels to the control group after 7 days of the experiment.
Micro-CT Study of Mongolian Gerbil Humeral Bone After Prolonged Spaceflight Based on a New Algorithm for Delimitation of Long-Bone Regions
