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Analysis of particulate contaminations of infusion solutions in a pediatric intensive care unit
Thomas Jack1, Bernadette E Brent, Martin Boehne
1Department of Pediatric Cardiology and Intensive Care Medicine, Hannover Medical School, Hannover, Germany. Thomasjack@gmx.de
Purpose:
To examine the physical properties and chemical composition of particles captured by in-line microfilters in critically ill children, and to investigate the inflammatory and cytotoxic effects of particles on endothelial cells (HUVEC) and macrophages in vitro.
Methods:
Prospective, observational study of microfilters following their use in the pediatric intensive care unit. In vitro model utilizing cytokine assays to investigate the effects of particles on human endothelial cells and murine macrophages.
Results:
Twenty filter membranes from nine patients and five controls were examined by electron microscopy (EM) and energy dispersion spectroscopy (EDX). The average number of particles found on the surface of the used membranes was 550 cm(2). EDX analysis confirmed silicon as a major particle constituent. Half of the filter membranes showed conglomerates containing an unaccountable number of smaller particles. In vitro, glass particles were used to mimic the high silicon content particles. HUVEC and murine macrophages were exposed to different contents of particles, and cytokine levels were assayed to assess their immune response. Levels of interleukin-1beta, interleukin-6, interleukin-8, and tumor necrosis factor alpha were suppressed.
Conclusions:
Particle contamination of infusion solutions exists despite a stringent infusion regiment. The number and composition of particles depends on the complexity of the applied admixtures. Beyond possible physical effects, the suppression of macrophage and endothelial cell cytokine secretion in vitro suggests that microparticle infusion in vivo may have immune-modulating effects. Further clinical trials are necessary to determine whether particle retention by in-line filtration has an influence on the outcome of intensive care patients.
Insights
Particle contamination in intravenous fluids was found in critically ill children. These particles, primarily silicon-based, suppressed immune responses in lab tests, suggesting potential immune-modulating effects in vivo.
Area of Science:
- Pediatric Intensive Care
- Materials Science
- Immunology
Background:
- Intravenous (IV) fluid administration is common in critically ill children.
- Concerns exist regarding particulate contamination in IV solutions.
- In-line microfilters are used to remove particles from IV fluids.
Purpose of the Study:
- To characterize particles captured by in-line microfilters in pediatric intensive care unit (PICU) patients.
- To investigate the in vitro inflammatory and cytotoxic effects of these particles on endothelial cells and macrophages.
Main Methods:
- Prospective observational study analyzing microfilters from PICU patients and controls.
- Electron microscopy (EM) and energy dispersive spectroscopy (EDX) for particle analysis.
- In vitro assays using human umbilical vein endothelial cells (HUVEC) and murine macrophages exposed to glass particles (mimicking silicon content), with cytokine level measurements.
Main Results:
- Particles, predominantly silicon-based, were found on microfilters (average 550 cm²).
- Conglomerates of smaller particles were observed on half of the filter membranes.
- In vitro, particle exposure suppressed levels of key cytokines (IL-1β, IL-6, IL-8, TNF-α) in HUVEC and macrophages.
Conclusions:
- Despite filtration, particle contamination of IV solutions occurs, varying with admixture complexity.
- In vitro findings suggest potential immune-modulating effects of infused microparticles.
- Further clinical studies are needed to assess the impact of particle retention on intensive care patient outcomes.
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