Knot formation of a guidewire during subclavian venous catheterization: A case report.

Central venous catheters are used for a variety of purposes, including emergency care, parenteral nutrition, and chemotherapy, but their insertion can cause mechanical complications such as malposition, arterial puncture, and pneumothorax. Here, we describe a rare case of guidewire knot formation during subclavian vein catheterization. A 70-year-old woman presented to our facility for central venous port placement for chemotherapy after surgical resection of a retroperitoneal liposarcoma. The left subclavian vein was selected and punctured under ultrasound guidance, and a guidewire was introduced. However, strong resistance prevented both advancement and withdrawal of the guidewire. Radiograph revealed a knot like shadow near the tip of the guidewire. After placement of a central venous port in the opposite site, the knotted guidewire was surgically removed. Intraoperatively, the guidewire was found to penetrate the vein and form a knot on the outside of the posterior wall. Although the guidewire was able to be removed, a postoperative chest x-ray revealed a left pneumothorax, which required 10 days of treatment. If a knot forms in a guidewire during catheterization, surgical removal is recommended because forcible pulling can damage the vessel. In conclusion, guidewire knot formation is a very rare complication, but physicians performing central venous catheterization should be aware of it, and this report describes how to prevent and manage it.