Reliability of cutaneous landmarks for the catheter length assessment during peripherally inserted central catheter insertion: A retrospective observational study.

INTRODUCTION: Peripherally inserted central catheters are very common devices for short, medium and long-term therapies. Their performance is strictly dependent on the correct tip location, at the junction between the upper caval vein and the right atrium. It is very important to obtain an estimated measure of the catheter, in order to reach the cavo-atrial junction and optimize the catheter length. Estimated measures are often obtained using cutaneous landmarks. OBJECTIVE: Evaluate the reliability of cutaneous landmark-based length estimation during catheter insertion. Identify any patient's related factors that may affect cutaneous landmarks reliability. METHODS: We used two distinct techniques and collected data about cutaneous landmark-based length estimation, electrocardiographic guided intravascular length, age, weight and height. We studied the reliability of possible correcting factors, balancing the error average by regression models, and we found and tested two different models of prediction. RESULTS: A total number of 519 patients were studied. The average bias, between the two studied length assessment by cutaneous landmarks and electrocardiographic guided catheter length, were 3.77 ± 2.44 cm and 3.28 ± 2.57 cm, respectively. The analysed prediction models (deviance explained 43.5%, Akaike information criterion = 1313.67% and 43.4%, Akaike information criterion = 1313.92), fitted on the validation set, showed a root mean square error of 3.07 and 3.06. CONCLUSION: Landmark-based length estimation for preventive catheter length assessment seems to be unreliable, when associated with post-procedural tip location. They are useful for distal trimming catheters to optimize the 'out of skin' portion when associated with electrocardiographic tip location. Models identified for balancing bias are probably not useful.

[The impact of closed system and 7 days intravascular administration set replacement on catheter related infections in a general intensive care unit: a before-after study]. / Efficacia della linea chiusa e sostituzione delle linee infusionali ogni 7 giorni sulle infezioni da catetere vascolare in una terapia intensiva polivalente: studio pre-post.

INTRODUCTION: The incidence of catheter related Bloodstream infections (BSI) is high in intensive care units (ICU). AIM: To evaluate the BSI rate in a population of patients admitted to a General ICU before and after the implementation of the 2011 CDC guidelines. METHODS: Retrospective observational study on patients admitted from January 2009 to December 2013. The infusion and monitoring lines were changed every 96 hours for the first 30 months, and every 7 days for the next 30. In all patients a closed infusion line with needle-free connectors pressure was used (Microclave). The following catheters were considered in the study: central venous catheter (CVC), arterial cannula (ART) and Swan Ganz catheter (SG). RESULTS: During the period with change every 96 hours 15 BSI were observed over 13395 catheters/days (C/D), 1.12 per 1000 C/D, while when lines where changed every 7 days 11 BSI were observed over 13120 C/D, 0.83 per 1000 C/D. A statistically significant reduction of BSI was observed in SG catheters (4.17 vs. no BSI p = 0.02), while the CVCS (1.12 vs 1.45 - p = 0.37) and ART (0.35 vs 0.36 - p = 0.61) infection rates remained unchanged. CONCLUSIONS: The replacement of infusion lines every 7 days in our sample did not increase the BSI, helping to reduce the costs.