Effect of Head Position During Thyroidectomy on Postoperative Cognitive Functions

Neck was rotated about 30-45 ° to the opposite side of the image. The common carotid artery and internal jugular vein were viewed transversely on the B Mode USG image. Then, the probe was rotated approximately 90 ° and the carotid artery was visualized in the longitudinal plane. The probe and guide line were adjusted so that the Doppler angle was 60 °. The image was created with the guiding line parallel to the blood flow. After imaging of the carotid artery bifurcation, measurements were made 1 cm distal to this level.