Background: In children, central venous catheter (CVC) placement is usually performed under ultrasound guidance for optimal visualization of vessels and reduction of puncture-related complications. Nevertheless, in many cases, additional radiographic examinations are performed to check the position of the catheter tip.
Aim: The primary objective of this observational feasibility study was to determine the number of ultrasound-guided central venous catheter tips that can be identified in a subsequent position check using ultrasonography. Furthermore, we investigated the optimal ultrasound window, time expenditure, and success rate concerning puncture attempts and side effects. In addition, we compared the calculated and real insertion depths and analyzed the position of the catheter tip on postoperative radiographs with the tracheal bifurcation as a traditional landmark.
Methods: Ninety children with congenital heart defects who required a central venous line for cardiac surgery were included in this single-center study. After the insertion of the catheter, the optimal position of its tip was controlled using one of four predefined ultrasound windows. A chest radiograph was obtained postoperatively in accordance with hospital standards to check the catheter tip position determined by ultrasonography.
Results: The children had a median (IQR) age of 11.5 (4.0, 58.8) months and a mean (SD) BMI of 15.3 (2.91) kg/m Ultrasound visualization of the catheter tip was successful in 86/90 (95.6%) children (95% confidence interval [CI]: 91.3%, 99.8%). Postoperative radiographic examination showed that the catheter tip was in the desired position in 94.4% (95% CI: 89.7%, 99.2%) of the cases. None of the children needed the catheter tip position being corrected based on chest radiography.
Conclusion: Additional radiation exposure after the placement of central venous catheters can be avoided with the correct interpretation of standardized ultrasound windows, especially in vulnerable children with cardiac disease.
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