Analysis of multi-frequency probe in the diagnosis of the stenosis of the first segment(V1) of the vertebral artery

Objective To evaluate the clinical significance of multi-frequency ultrasound probe for detecting the stenosis of the first segment(V1) of the vertebral artery.Methods Thirty-six patients with V1 stenosis of the vertebral artery confirmed by DSA and 50 vertebral arterys of 25 normal controls were enrolled in this study.Thirty-six patients were divided into mild,moderate,and severe groups according to the stenosis degree.High frequency and abdominal low frequency probe were used to observe the V1 of the vertebral artery and detect the inner diameter.Color Doppler ultrasound was used to detect the peak systolic velocity(vs),peak diastolic velocity(vd),resistance index(RI).Results ①The normal vertebral artery displayed as smooth wall,normal diameter and good sound transmission of the lumen.Color Doppler flow imaging showed the good flow filling and low Doppler RI.②The imaging of V1 stenosis of the vertebral artery displayed the narrowed diameter,thinner blood or reverse flow.Doppler showed that vs,vd reduced and RI increased.③The diagnostic rate was not statistically different by Doppler ultrasound and DSA(P0.05).Conclusion The combined application of high and low frequency probes has an important value to detect the V1 stenosis of the vertebral artery.