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Figure 5: Appearance of vertebral arteries (VAs) on longitudinal imaging. VA runs in between the transverse processes of VAs. Vertebral vein runs parallel to the VA. Lower panels show hyperaemia-ischemia cuff test in a patient with subclavian steal syndrome. Spectra obtained at rest show "to and fro" flow pattern. Note that sudden release of the blood pressure cuff shows complete reversal of flow in the VA

Figure 5: Appearance of vertebral arteries (VAs) on longitudinal imaging. VA runs in between the transverse processes of VAs. Vertebral vein runs parallel to the VA. Lower panels show hyperaemia-ischemia cuff test in a patient with subclavian steal syndrome. Spectra obtained at rest show