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Background Prolonged maintenance of central venous catheter including peripherally inserted central catheter (PICC) is a major risk factor for central line-associated bloodstream infection (CLABSI). Methods A single-center retrospective study was conducted in an 828-bed tertiary hospital in Korea between January 2010 and December 2017. All hospitalized patients who underwent ultrasound-guided PICC insertion were enrolled. Patients were excluded if they: (1) were under 19 years old, (2) died, were discharged, or were transferred to other medical institutions within 3 days of PICC placement, and (3) had at least one result of absolute neutrophil count (ANC) under 500 cell/µL during catheterization. CLABSI was diagnosed using the definitions of the National Health Safety Network. CLABSI caused by PICC was defined as PICC-associated bloodstream infection (PABSI). For identifying the statistical correlation between catheter-days and PABSI, odd ratio for PABSI according to the continuous value of catheter-days was analyzed using restricted cubic spline splits with five knots. Receiver operating characteristic (ROC) curve was used to determine the diagnostic precision of applying catheter-days for PABSI. The optimal cut-off value of catheter-days was identified by maximizing the area under ROC curve (AUC). Results A total of 1,053 patients underwent ultrasound-guided PICC insertion during the study period. Of them, 36 cases were confirmed as PABSI (3.5%, 36/1,014; 1.14 per 1,000 catheter days). In the restricted cubic spline regression, catheter maintenance days showed a dose-dependent relationship with the risk of PABSI. The ROC for developing PABSI according to catheter maintenance duration showed that the AUC was 0.715 (95% CI 0.639–0.790) and the optimal cut-off value was 25 days. Conclusion The incidence of PABSI was 1.14 per 1,000 catheter days and the optimal cut-off value of catheter-days for preventing PABSI was 25 days. Disclosures All authors: No reported disclosures.

open forum infectious diseases

1172. The Proper Maintenance Duration for Peripherally Inserted Central Catheter (PICC) In order to Prevent Central Line-Associated Bloodstream Infection