CVC is a common and valuable procedure for fluid and blood infusion, drug administration, and hemodynamic monitoring in the operating room, emergency room, and intensive care unit. A MAC is a large-bore catheter that prevents kinking or collapsing. It is used for rapid fluid and blood administration during trauma and resuscitation. Additionally, another CVC can be placed through the sheath hub to monitor central venous pressure or to apply additional medication or a fluid line [
1]. However, it is an invasive procedure and the incidence of complications ranges from 2% to 26% [
2]. Complications include bleeding, hematoma, malpositioning of the catheter, thrombosis, arrhythmia, infection, pneumothorax, and hemothorax [
3]. To reduce the occurrence of these complications, it is necessary to limit the use of MAC, or to use ultrasound. In addition, physician experience can affect the incidence of complications [
4,
5].