• Toshimi Arai, Yoshifumi Matsuda, Kyoko Koizuka, and Asako Yasuoka.
• Department of Anesthesiology, Gunma Children's Medical Center, Shibukawa, Gunma, Japan. tarai@gcmc.pref.gunma.jp
• Paediatr Anaesth. 2009 Sep 1;19(9):844-7.

BackgroundTraditionally, we have been puncturing the internal jugular vein (IJV) with the head rotated. However, in adults it has been suggested that rotation of the head increases the magnitude of an overlapping of the IJV to the carotid artery (CA). Therefore, in infants and children, we have examined anatomic relationship between the IJV and the CA under the head in midline and head in rotated position.MethodEleven infants and 51 children were included. Under general anesthesia, the patient was positioned in the Trendelenburg position with a shoulder roll to allow extension of the neck. At first, the head was placed in the midline position. The ultrasound probe was placed perpendicular to the skin, and images of the right IJV and CA were collected at the level of the cricoid cartilage. Then, the head was rotated to the left at 45 degrees. The images were collected in the same way. The position of the right IJV relative to the CA was defined as anterior (A), anterolateral (AL), or lateral (L).ResultsRotation of the head increased the magnitude of an overlapping because of more changes from L --> AL, L --> A, or AL --> A (P < 0.05, Wilcoxon t-test).ConclusionWe conclude that the rotation of the head increases the magnitude of an overlapping of the IJV to the CA in infants and children.

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