Infection Risk, Standardisation and Sustainability In Critical Care Practice
Arterial catheters (ACs) are routinely used in critical care for invasive blood pressure monitoring and frequent blood sampling. Despite their widespread use, arterial lines are often perceived as lower risk than central venous catheters (CVCs) and are therefore sometimes inserted with less stringent aseptic precautions. Increasing evidence suggests this distinction is not supported by infection risk data and that arterial catheter insertion should be approached with the same level of rigour as central venous access.
This article reviews the evidence on arterial catheter–related infection risk, discusses the role of standardised insertion practices and procedure packs, and considers the wider clinical, economic and sustainability implications for intensive care services.
Infection Risk: Arterial Catheters Are Not “Low Risk”
A landmark prospective observational study published in Critical Care Medicine in 2010 compared the infectious risks associated with arterial catheters and central venous catheters in critically ill patients [1]. The study evaluated catheter colonisation and catheter‑related infection (CRI) rates across multiple intensive care units.
Key findings
The authors reported that:
- Catheter colonisation and catheter‑related infection rates were similar between arterial catheters and CVCs
- Both arterial and central lines contributed to bloodstream infection risk and warranted active monitoring
- Arterial catheters showed an increase in the daily risk of colonisation over time, a pattern not observed with CVCs
The authors concluded:
“The risks of colonisation and catheter‑related infection did not differ between arterial catheters and central venous catheters, indicating that arterial catheter use should receive the same precautions as central venous catheter use.” [1]
These findings directly challenge the notion that sometimes arterial lines can be managed with less stringent infection prevention measures. From a patient safety perspective, arterial catheter–associated bloodstream infections (AC‑BSIs) and CVC‑associated bloodstream infections (CVC‑BSIs) should be addressed with equal priority.
The Importance of Insertion Practice And Standardisation
Catheter‑related infection is influenced by multiple factors, but insertion technique remains a critical, modifiable determinant. Variability in aseptic practice increases the likelihood of microbial contamination, particularly at the skin–catheter interface.
The evidence supporting maximal barrier precautions during CVC insertion is long established. The Michigan Keystone ICU project demonstrated a sustained reduction in central line‑associated bloodstream infections through consistent application of a small number of evidence‑based measures, including maximal sterile barrier precautions and standardised insertion processes [2]. These outcomes were successfully replicated in the UK through the Matching Michigan programme [3].
While these initiatives focused primarily on central venous access, the underlying principle is transferable: standardisation reduces variability, and reduced variability reduces harm.
Given the comparable infection risks identified for arterial catheters, applying the same structured, standardised approach to arterial line insertion is a logical extension of these quality improvement strategies.
Supporting Reliable Practice with Procedure Packs
One challenge in maintaining consistent aseptic technique is the practical reality of assembling multiple sterile components at the point of care. Procedure packs can support reliable practice by providing all required items preassembled in a single sterile unit, removing the need to source individual components separately.
From a clinical perspective, this approach can:
- Reduce interruptions during the procedure
- Support adherence to maximal barrier precautions
- Minimise omissions caused by time pressure or environmental distractions
Importantly, the value of standardisation lies not in convenience alone, but in reproducibility. Reliable processes are a cornerstone of infection prevention, particularly for procedures that are frequent and perceived as routine.
Clinical, Economic and Environmental Considerations
Preventing catheter‑related bloodstream infection has implications beyond the immediate procedural episode. Each bloodstream infection avoided is associated with:
- Fewer ICU bed days
- Reduced antibiotic exposure
- Lower risk of antimicrobial resistance
- Reduced procedural and diagnostic burden
These clinical benefits also translate into environmental impact. Prolonged ICU stays and antibiotic use contribute significantly to healthcare‑associated carbon emissions. Reducing preventable infections therefore supports both patient safety and sustainability goals.
This is increasingly relevant within the NHS, where procurement decisions must now consider environmental and social value. Since April 2022, all NHS procurements have included a minimum 10% weighting for net zero and social value, reflecting the NHS commitment to reducing supply chain emissions and supporting sustainable practice [4].
When viewed in this context, the incremental cost of a standardised arterial line procedure pack represents a marginal increase when compared with sourcing individual items separately. This difference is small relative to the overall cost of critical care delivery and negligible when weighed against the clinical and environmental costs of a preventable bloodstream infection.
Conclusion
Evidence demonstrates that arterial catheters and central venous catheters have similar risks of colonisation and catheter‑related infection in critically ill patients. These findings support the use of the same insertion precautions for arterial lines as those established for central venous access.
Experience from the Michigan Keystone and Matching Michigan programmes highlights the effectiveness of standardisation and maximal barrier precautions in reducing bloodstream infections. Extending these principles to arterial catheter insertion, supported by well‑designed procedure packs, represents an evidence‑informed approach to improving patient outcomes while also supporting NHS sustainability objectives.
References
- Garrouste‑Orgeas M, Timsit JF, Soufir L, et al. Infectious risk associated with arterial catheters compared with central venous catheters. Crit Care Med. 2010;38(4):1030–1035.
- Pronovost P, Needham D, Berenholtz S, et al. An intervention to decrease catheter‑related bloodstream infections in the ICU. N Engl J Med. 2006;355(26):2725–2732.
- Bion J, Richardson A, Hibbert P, et al. ‘Matching Michigan’: a 2‑year stepped interventional programme to reduce central venous catheter–bloodstream infections in intensive care units in England. BMJ Qual Saf. 2013;22(2):110–123.
- NHS England. Net Zero and Sustainable Procurement: NHS Supplier Roadmap. London: NHS England; 2022.
