The Effect of Head Position on the Cross-sectional Area of the Subclavian Vein.

In 41 healthy volunteers, we investigated the cross-sectional area (CSA) of the subclavian vein (SCV) in the following head positions: neutral and 30[degrees] head rotation toward the contralateral or ipsilateral sides. Significant differences were observed in the CSA of the SCV at 3 different head positions: contralateral 30[degrees] versus neutral, -0.05 cm2 (95% confidence interval, -0.08 to -0.03); contralateral 30[degrees] versus ipsilateral 30[degrees], -0.15 cm2 (-0.19 to -0.12); neutral versus ipsilateral 30[degrees], -0.10 cm2 (-0.13 to -0.07); all Pcorrected

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