[Computer-assisted spectrum analysis of Doppler ultrasonograms in occlusive lesions of the carotid arteries].

Efficacy of surgical treatment is related to the early diagnosis of extracranial injuries to the carotid arteries. Thirty-five patients with initial manifestations of brain circulatory failure were examined with the aid of spectral computer analysis of ultrasonograms (SCA USG). According to SCA and radiocontrast angiography, 3 grades of stenosis were distinguished: grade I--unevenness of contours, grade II--stenosis exceeding 50%, and grade III--occlusion. Based on the grades of stenosis, 7 quantitative parameters of SCA USG and significance of each parameter were analyzed with the aid of dispersion analysis. The postoperative period was characterized by positive dynamics of the quantitative parameters of SCA USG: spectral enlargement, systolic acceleration; the time of the systolic peak rise.