Evidence that bacteria prefer to adhere to thrombus

Area of Science:

• Biomedical Engineering
• Infectious Disease Research
• Thrombosis Research

Background:

• Thrombosis is a significant complication associated with medical devices.
• The interaction between thrombus formation and bacterial colonization remains incompletely understood.
• Understanding this interaction is crucial for preventing device-related infections.

Purpose of the Study:

• To investigate the association between thrombus development and bacterial adhesion in vitro.
• To determine if thrombus size influences bacterial interaction.
• To assess bacterial incorporation into developing thrombi on stent-like devices.

Main Methods:

• Utilized an in vitro blood recirculation model with stent-like devices.
• Induced controlled thrombus formation through adjusted anticoagulation.
• Quantified bacterial (Staphylococcus epidermidis) adhesion to thrombi using radiolabeled bacteria (111Indium-oxine).
• Monitored blood flow and thrombus growth over time.

Main Results:

• Thrombus formation increased progressively over the experimental duration.
• Bacterial adhesion to the thrombus showed a direct correlation with increasing thrombus size.
• Bacteria were incorporated into the thrombus irrespective of their viability or prior antibiotic treatment.

Conclusions:

• Developing thrombi on medical devices may act as a nidus for bacterial colonization.
• Increased thrombus burden correlates with enhanced bacterial adhesion.
• These findings suggest that devices with adherent thrombi are more susceptible to infection.