Evaluation of the effect of therapeutic plasma exchange on serum cytokine levels in pediatric intensive care unit.
Selen Ceren Cakmak, Hazal Ceren Tugrul, Dilan Akgun Unlu et al.
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In 30 seconds
This clinical study assessed changes in serum IL-6 and TWEAK in 41 critically ill children in a pediatric intensive care unit who underwent therapeutic plasma exchange (TPE) between May and December 2022. Measurements before and after the procedure showed that IL-6 increased significantly after TPE (p: 0.006), whereas TWEAK decreased (p: 0.030). Pre-TPE levels of these markers were associated with selected measures of illness severity, but neither marker differed significantly by prognosis. The findings suggest potential value for assessing inflammation and severity, but not for predicting outcome.
Key findings
- IL-6 levels rose significantly after TPE (p: 0.006), while TWEAK levels fell (p: 0.030).
- Pre-TPE IL-6 correlated positively with ventilation duration and ferritin levels (p <0.05).
- Pre-TPE TWEAK correlated with organ failure indicators and D-Dimer levels (p <0.05).
- IL-6 and TWEAK levels did not differ significantly by prognosis (p >0.05).
Why it matters
The opposing post-procedure changes show that cytokine measurements may be affected by TPE itself, which is relevant when interpreting serial results in critically ill children. Associations with severity indicators may support their use as markers of inflammation or illness burden, but the absence of a prognostic difference cautions against treating these measurements as reliable outcome predictors.
What to keep in mind
The study observed a small group of 41 children undergoing TPE and reports pre- and post-procedure measurements; it does not establish that the cytokine changes were caused by TPE or that the markers predict clinical outcomes.