Complications of Midline Catheter in Surgical Children

The goal of this observational study is to understand the incidence and risk factors of complications associated with midline catheter placement in pediatric patients (under 18 years old) undergoing general anesthesia. The main questions it aims to answer are: What is the overall complication rate (including malfunction, bleeding, thrombosis, inflammation, and infection) after midline catheter placement in children? What factors (e.g., age, weight, vein diameter, insertion site, catheter maintenance duration) are associated with a higher risk of complications? Participants will: Receive a midline catheter during surgery under general anesthesia. Undergo ultrasound-guided assessment of the catheter site immediately after placement, 24 hours later, and before the catheter is removed. Be monitored for any complications related to the catheter, including infection, blood clots, or blockage. This study will help identify which factors increase the risk of complications, improving the safe use of midline catheters in pediatric patients.