Fig. 1

A) Subclavian and axillary vein anatomy. Position of the probe on the axillary vessels with the typical B) two-dimensional image. C, D) The axillary vein becomes the subclavian vein under the subclavius muscle and the clavicle. Reproduced with permission from: Denault AY, Vegas A, Lamarche Y, Tardif JC, Couture P. Basic Transesophageal and Critical Care Ultrasonography. London: CRC Press; 2017

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