Bacterial contamination of arterial lines. A prospective study

Area of Science:

• Critical Care Medicine
• Infection Control
• Medical Device Management

Background:

• Indwelling arterial catheters are crucial for hemodynamic monitoring and blood sampling in critically ill patients.
• Concerns exist regarding bacterial contamination and infection transmission from arterial monitoring systems.
• Current practices often involve routine replacement of system components, increasing costs.

Purpose of the Study:

• To evaluate the safety and contamination risk of arterial monitoring systems without routine component replacement.
• To determine the impact of continuous flush device placement on transducer fluid contamination.
• To assess the incidence of bacterial growth in arterial sampling ports.

Main Methods:

• A prospective study involving 117 patients with indwelling arterial catheters for hemodynamic monitoring.
• Catheterization duration ranged from 25 to 439 hours with no system component replacement.
• Bacterial cultures were performed on transducer dome fluid, sampling stopcocks, and arterial catheter tips.

Main Results:

• No contamination of transducer dome fluid was observed when the continuous flush device was positioned distal to the transducer.
• Bacterial growth was detected in the sampling stopcock of 16.2% of patients.
• In a case of systemic infection, transducer fluid cultures remained negative, suggesting the source was not the fluid column.

Conclusions:

• Eliminating static inline fluid columns and employing aseptic sampling techniques effectively minimize the risk of transmitted bacterial infection.
• Routine replacement of arterial monitoring system components is not indicated.
• These findings suggest significant cost savings can be achieved by avoiding unnecessary component changes.