[Dolicho-arteriopathies (kinking, coiling, tortuoosity) of the carotid arteries: study by color Doppler ultrasonography].

BACKGROUND: This work aimed to study extracranial carotid dolichoarterial disease in outpatients using color Doppler ultrasonography.
METHODS: A total of 1220 outpatients, 620 males and 600 females, aged between 25 and 89 years old, were enrolled in the study. Subjects were divided into three groups according to age: under 60, between 60 and 70, over 70. Color Doppler ultrasonography was performed on the extracranial carotid using Acuson 128 XP/5 ultrasonograph and linear 7 MHz probe. Reference was made to Weibel and Field's classification for kinking, coiling and tortuosity for the classification of dolichoarterial disease.
RESULTS: Of the 1220 subjects examined, 316 (25.9%) presented dolichoarterial disease, 126 males (39.9%) and 190 females (60.1%) with a male/female ratio of 1:1.5. Of the 316 cases of dolichoarterial disease, 171 (54.1%; 14% of the patients examined) showed kinking, 36 (11.4%; 2.9% of the patients examined) showed coiling, 109 (34.5%; 8.9% of the patients examined) showed tortuosity. Females were predominantly affected by kinking (male/female ratio: 1:1.8) and coiling (male/female ratio: 1:1.8), whereas the two sexes were equally affected by tortuosity (male/female ratio: 1:1). 76 out of 387 subjects (19.6%) presented dolichoarterial disease in the under-60 group, 128 out of 441 subjects (29.3%) in the 60-70-year-old group, and 112 out of 392 subjects (28.6%) in the over-70 group. The prevalence of dolichoarterial disease remained stationary after the age of 70, as the result of different findings in the two sexes, but continued to increase in males, while it diminished in females. This trend was clearly evident for kinking and coiling, whereas the prevalence of the two sexes was comparable with regard to tortuosity, slightly higher in females under the age of 70 and slightly higher in males after the age of 70. Of the 316 cases of dolichoarterial disease diagnosed, 297 (94%) were localised at the level of the internal carotid artery, with a predominance for the left (47.8%) artery compared to the right (22.1%), 14 (4.4%) at the level of the external carotid artery and 5 (1.6%) affecting the common carotid. Dolichoarterial disease was monolateral in 239 subjects (75.6%) and bilateral in 77 (24.4%). Of the bilateral cases, only one affected the common carotid, 76 the internal carotid with much higher presence of kinking and coiling compared to tortuosity. As far as concerns the site of dolichoarterial disease, no difference was observed between the sexes.
CONCLUSIONS: In conclusion, non-invasive color Doppler ultrasonography, which is easily repeatable, can provide useful data for the morphological evaluation of dolichoarterial disease. Further studies in large populations which will enable the anatomofunctional aspects obtained using color Doppler ultrasonography to be correlated with clinical symptoms and possible effects on the central nervous system are now required for an improved clinical and prognostic assessment of dolichoarterial disease.