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Pulse-wave Doppler ultrasound flow (A) before, (B) 3 weeks and (C) 5 weeks following ameroid constrictor placement around right common carotid artery. Pre-surgery, the peak blood flow velocity of right common carotid artery) was evident, however, the peak flow velocity was markedly reduced at 3 weeks after the operation, and was not observed at 5 weeks.
