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(a) Sustained passive rotation to the left: Doppler ultrasound to assess the right CCA (2 cm proximal to the carotid bulb). CCA: Common Carotid Artery. (b) Pre-manipulative thrust posterior-anterior on right C1 in extension, rotation and contralateral lateral-flexion of the cervical spine: Doppler ultrasound to assess the left CCA (2 cm proximal to the carotid bulb). CCA: Common Carotid Artery
