Objective: To evaluate the cost-effectiveness of the antiseptic-impregnated catheter compared with conventional catheters in preventing catheter-related blood stream infections (CR-BSI). Design: Cost-effectiveness analysis; clinical trial, experimental, randomized, controlled, prospective, open label. Patients and Methods: A 172 patient cohort, under 1-year-old or less than 10 kg, postoperative cardiovascular children with central venous catheters (CVC) admitted to Cardiac Intensive Care Unit (UCI 35) at Hospital Nacional de Pediatría "Prof. Dr. Juan P. Garrahan", since September 2005 to December 2007. Demographic and CVC data were retrieved to compare: age, gender, weight, diagnosis, surgery, CVC days, costs and complications. Intervention: CVC Arrow, double-lumen, > 48 h of duration; intervention group: antiseptic-impregnated CVC vs control group: CVC without antiseptics (conventional). Results: The incidence of CR-IE (CR-Infected Events: colonization, local infection and/or CRBSI; combined end point) was 27% for antiseptic-impregnated CVC vs. 31% for conventional catheters (p = 0.6) with similar accumulated incidence of CR- BSI: 2.8 vs. 3.3 per 1000 days catheter. We found no differences between groups, except in weight: median 4.0 kg (r 2-17) vs 4.7 kg (r 2-9) p = 0.0002 and age, median 2 months (r 1- 48) vs 5 months (r 1- 24) p= 0.0019 in antiseptic-impregnated CVC group. These differences, though statistically significant were clinically non relevant. Median cost per patient during intensive care stay in the conventional CVC group was $3.417 (359-9.453) and in the antisepticimpregnated- CVC group was $4.962 (239-24.532), p = 0.10. Conclusions: The use of antiseptic-impregnated CVC compared with conventional CVC did not decrease CR-BSI in this population. The cost per patients was higher in the antiseptic impregnated CVC group. These results do not support the routine use of this type of CVC in our population.