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Radiolabeling of the platelets with Indium-111 tropolone and the LDL-C and HDL-C lipoproteins with Iodine-131 and Iodine-125 provided us a with a quantitative method of measurement of platelet deposition and uptake of Iodine-131and C-14 labeled cholesterol, LDL-C and HDL-C on all segments of coronary artery bypass graft in the acute and chronic phase in the canine model. We sampled the thrombogenicity and cholesterol uptake for a 24-hours exposure/ interaction time of tracers after intravenous injection, post-CABG implantation at 1, 3, 7, 30, 90 and 365 days. Most of the reactivities of components of CABG or components of cardiovascular prostheses are passivated after absorption of albumin, and coverage with fibroblasts and/or partially with endothelial cells. Although we calculated the percent of injected dose on CABG segments, the algebraic equation for the calculation of Regional Platelet Density (RPD) revolutionized our measurement methods. RPD was higher at the proximal and distal anastomoses than the mid-section of CABG. We also evaluated the role of endothelial cell loss by SEM technique during the harvesting and post-suturing of saphenous vein graft on the platelet deposition on the injured intima in the acute and chronic phase and their inhibition using Persantine before CABG and Aspirin after surgery. As the SEM studies demonstrated the complete endothelialization of the CABG at 90 days, there was no difference in regional platelet density between the treated and control animals. Platelet consumption on the components of the heart-lung machine and platelet fragmentation by the roller or centrifugal pump along with the hollow-fiber oxygenator perturb the functional platelet pool during the cardiopulmonary bypass procedure. Using several control animals and separate cardiopulmonary bypass experiments, we also measured the number of platelets consumed in the wound-healing process, about 15-20% of injected dose and components of the heart-lung machine, which declined significantly during two decades of our measurements from 25% to 0.25%. These clinically relevant issues that transform the CABG into venosclerosis were reviewed by critical analysis of all segments of CABG in a comprehensive manner.

angiology and vascular surgery

Wound-Healing In The Saphenous Vein Coronary Bypass Graft In The Canine Model: Endothelial Cell Loss, Platelet Thrombus Formation, Its Inhibition With Aspirin-Persantine Therapy And Cholesterol Influx In The Acute And Chronic Phase