PMC6370112_01
Ultrasound imaging after placement of the catheter. (A) Transverse view of the brachial vein. Dashed circle indicates the brachial vein. Arrow indicates the catheter inside the brachial vein. (B) Longitudinal view of the brachial vein. A catheter is present inside the brachial vein. Catheter = midline, V = brachial vein, A = brachial artery.
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F1
SMAC Plus, Nippon Covidien, Japan), a commercially available central venous catheter (there is no commercially available midline catheter in Japan). Successful insertion of the catheter was confirmed with ultrasound imaging (Fig. 1).
Midline catheter placed in the right arm. Arrow indicates skin insertion site in the arm.
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F2
The catheter entered the vein 6 cm from the skin entry site (Fig. 2).
Blood flow in the vein after catheter placement. (A) Transverse view of the brachial vein. Mosaic pattern can be seen inside the brachial vein. Arrow indicates the catheter inside the brachial vein. (B) Longitudinal view of the brachial vein. The midline catheter is inside the brachial vein. Catheter = midline, V = brachial vein, A = brachial artery.
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F3
After placing the catheter, we checked venous flow using color Doppler imaging (Fig. 3).