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1Department of Neurosurgery, Karaelmas University FOM, Zonguldak, Turkey. cagavif@yahoo.com
Background:
Shunt infections are one of the major causes of mortality and morbidity of patients with hydrocephalus. The aim of this research is to compare the bacterial colonization characteristics of a regular silicone elastomer shunt material coated with polyvinylpyrrolidone and dimethylpolysiloxane (silicone).
Method:
Regular coated shunt materials were compared by in-vivo and in-vitro methods. In the in-vitro experiment, silicone and coated material immersed and not immersed in vancomycin solution was treated with a certain concentration of Staphylococcus epidermidis. In the in-vivo study, silicone and coated material specimens were treated with Staphylococcus epidermidis and they were stereotactically placed in the lateral ventricles of the rats. One week after the inoculation, shunt pieces were removed and the colonies were counted by using a scanning electron microscope.
Findings:
There was a statistically significant difference of colonization in the in-vitro groups in coated material vs. silicone, coated material vs. vancomycin treated silicone, vancomycin treated coated material vs. silicone, vancomycin treated coated material vs. vancomycin treated silicone. There was no statistically significant difference for colonization in in-vitro groups of coated material and vancomycin treated coated material. With in-vivo experiments we can say that, coated material catheters are superior than the silicone catheters in respect to colonization but after the bacterial colonization has occurred, the amount of colonization did not differ.
Interpretation:
Coated material catheters are superior to silicone catheters and they prevent bacterial colonization in some respect.
Insights
Coated shunt materials show superiority over regular silicone in preventing bacterial colonization, reducing shunt infections in hydrocephalus patients. Further research is needed to fully understand colonization dynamics.
Area of Science:
- Neurosurgery
- Biomaterials Science
- Infectious Disease
Background:
- Shunt infections are a significant cause of mortality and morbidity in hydrocephalus patients.
- Hydrocephalus management often involves cerebrospinal fluid shunts, which are susceptible to bacterial colonization.
- Preventing shunt infections is crucial for improving patient outcomes.
Purpose of the Study:
- To compare the bacterial colonization characteristics of a novel coated shunt material against standard silicone elastomer shunts.
- To evaluate the efficacy of polyvinylpyrrolidone and dimethylpolysiloxane coating in preventing Staphylococcus epidermidis colonization.
- To assess the impact of vancomycin treatment on bacterial colonization for both shunt materials.
Main Methods:
- In vitro experiments involved exposing silicone and coated materials to Staphylococcus epidermidis, with and without vancomycin treatment.
- In vivo studies utilized a rat model where shunt materials inoculated with Staphylococcus epidermidis were placed in the lateral ventricles.
- Bacterial colonization was quantified using scanning electron microscopy after one week.
Main Results:
- In vitro, the coated material demonstrated significantly reduced bacterial colonization compared to uncoated silicone, irrespective of vancomycin treatment.
- No significant difference in colonization was observed between the coated material and vancomycin-treated coated material in vitro.
- In vivo, coated material catheters exhibited superior resistance to initial bacterial colonization compared to silicone catheters.
Conclusions:
- The coated shunt material is superior to standard silicone in preventing bacterial colonization, offering a potential reduction in shunt infections.
- While the coated material reduces initial colonization, the extent of colonization does not differ once established.
- These findings suggest that coated materials may play a role in mitigating shunt-related complications in hydrocephalus management.
