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The oxidative stress is characterized and identified mostly from the end-products and the involvement of oxygen molecules (O 2 ) and its free radical anion (O 2 -*) at the final steps of free radical reactions, as well as at the electron transfer reactions. The free radicals are continuously produced endogenously in the living cells from metabolites, while external factors, such as cosmic rays, medical diagnostic techniques, and xenobiotics lead also to free radical production [2,[9][10][11][12][13][14][15]. Free radicals because of the presence of non-paired electrons are very reactive species and they have the

Background/Aim: The pathogenesis, treatment and prevention of atherosclerosis continue to be the subject of intensive research and study by the scientific community. Based on Fourier-transform infrared spectra and 3D-Doppler echogram, we attempted to develop a computational simulation model for predicting the association of atherosclerotic risk factors with pathogenic molecular structural changes. Materials and Methods: Atheromatic carotid arteries from 56 patients (60-85 years old) were used as samples. Color 3D-Doppler echogram screening was performed on all patients preoperatively. Each infrared spectrum consisted of 120 co-added spectra at a spectral resolution of 4 cm −1 . Results: The infrared spectral analysis reveals 'marker bands', such as the 1,744 cm −1 band assigned to aldehyde formation and to the 'fingerprint' digital spectral region of 1,050-1,169 cm −1 , characteristic of the presence of advanced glycation end products (C-O-C). The accumulation of calcium phosphate salts increases the formation rate of stenosis. The critical point of stenosis risk starts at about 45%, while when stenosis is over 60-70%, the risk of ischemic stroke or other major adverse cardiovascular events increases dramatically. Conclusion: Fourier-transform infrared spectroscopy and mathematical simulation models showed that carotid artery stenosis over 45% reduces the blood flow rate, while stenosis over 65% dramatically increases the hemodynamic disturbance, with a parallel increase the rate of ischemic stroke or other major adverse cardiovascular events.