Abstract: Objective To investigate and analysis the application values of cervical vascular ultrasound in the diagnosis of collateral circulation in patients with early internal carotid artery occlusion. Methods From February 2018 to May 2022, 88 cases of patients with early internal carotid artery occlusion diagnosed and treated in Zhenba County People's Hospital were selected as study subjects. All patients were given carotid artery ultrasound examination and recorded the ultrasonic characteristics. At the same time, all patients were given digital subtraction angiography, all the cases were to record the formation of collateral circulation and judge the diagnostic value. Results There were 38 (43.18%) cases were diagnosed as collateral circulation formation by digital subtraction angiography (DSA) in the 88 cases. There were no significant difference in sex, age, course of disease, body mass index, systolic blood pressure, diastolic blood pressure, fasting blood glucose compared between the formed group and the non formed group (P>0.05). The ultrasonic blood flow velocity of vertebral artery and basilar artery in the formed group were significantly higher than that in the non formed group (P<0.05). The score of National Institute of Health Stroke Scale (NIHSS) in the formed group were significantly lower than that in the non formed group at admission (P<0.05). Among the 88 patients, 36 of them were judged to have collateral circulation by ultrasound, Kappa=0.907 (P<0.001). The sensitivity and specificity of cervical vascular ultrasound in diagnosing collateral circulation formation in patients with early internal carotid artery occlusion were 92.11% (35/38) and 98.00% (49/50). Conclusion Most patients with early internal carotid artery occlusion are accompanied by collateral circulation formation, which can improve the patient's condition and increase the blood flow velocity of vertebral artery and basilar artery. Cervical vascular ultrasound has important value in judging collateral circulation in patients with early internal carotid artery occlusion.

Key words: cervical vascular ultrasound, internal carotid artery occlusion, collateral circulation, basal artery, sensitivity, specificity