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Intensive Care Medicine

, Volume 42, Issue 3, pp 379–392 | Cite as

Circulating phthalates during critical illness in children are associated with long-term attention deficit: a study of a development and a validation cohort

  • S. Verstraete
  • I. Vanhorebeek
  • A. Covaci
  • F. Güiza
  • G. Malarvannan
  • P. G. Jorens
  • G. Van den BergheEmail author
Original

Abstract

Purpose

Environmental phthalate exposure has been associated with attention deficit disorders in children. We hypothesized that in children treated in the pediatric intensive care unit (PICU), circulating phthalates leaching from indwelling medical devices contribute to their long-term attention deficit.

Methods

Circulating plasma concentrations of di(2-ethylhexyl)phthalate (DEHP) metabolites were quantified in 100 healthy children and 449 children who had been treated in PICU and were neurocognitively tested 4 years later. In a development patient cohort (N = 228), a multivariable bootstrap study identified stable thresholds of exposure to circulating DEHP metabolites above which there was an independent association with worse neurocognitive outcome. Subsequently, in a second patient cohort (N = 221), the observed independent associations were validated.

Results

Plasma concentrations of DEHP metabolites, which were virtually undetectable [0.029 (0.027–0.031) µmol/l] in healthy children, were 4.41 (3.76–5.06) µmol/l in critically ill children upon PICU admission (P < 0.001). Plasma DEHP metabolite concentrations decreased rapidly but remained 18 times higher until PICU discharge (P < 0.001). After adjusting for baseline risk factors and duration of PICU stay, and further for PICU complications and treatments, exceeding the potentially harmful threshold for exposure to circulating DEHP metabolites was independently associated with the attention deficit (all P ≤ 0.008) and impaired motor coordination (all P ≤ 0.02). The association with the attention deficit was confirmed in the validation cohort (all P ≤ 0.01). This phthalate exposure effect explained half of the attention deficit in post-PICU patients.

Conclusions

Iatrogenic exposure to DEHP metabolites during intensive care was independently and robustly associated with the important attention deficit observed in children 4 years after critical illness. Clinicaltrials.gov identifier: NCT00214916.

Keywords

PICU Critical illness Sepsis Phthalate Attention Neurocognitive development Plasticizers 

Notes

Acknowledgments

This work was supported by the Research Foundation-Flanders (FWO), Belgium (FWO fellowship to SV); by the Methusalem program of the Flemish government (through the University of Leuven to GVdB, METH/08/07 and to GVdB and IV, METH14/06); by an ERC Advanced Grant (AdvG-2012-321670) from the Ideas Program of the European Union 7th framework program to GVdB; and by the Institute for Science and Technology, Flanders, Belgium (through the University of Leuven to GVdB, IWT/070695/TBM).

Compliance with ethical standards

Conflicts of interest

The authors declare that they have no conflict of interest.

Supplementary material

134_2015_4159_MOESM1_ESM.pdf (5.2 mb)
Supplementary material 1 (PDF 5287 kb)
134_2015_4159_MOESM2_ESM.docx (814 kb)
Supplementary material 2 (DOCX 814 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg and ESICM 2015

Authors and Affiliations

  • S. Verstraete
    • 1
  • I. Vanhorebeek
    • 1
  • A. Covaci
    • 2
  • F. Güiza
    • 1
  • G. Malarvannan
    • 2
  • P. G. Jorens
    • 2
    • 3
  • G. Van den Berghe
    • 1
    Email author
  1. 1.Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular MedicineKU LeuvenLeuvenBelgium
  2. 2.Toxicology CenterUniversity of AntwerpWilrijkBelgium
  3. 3.Department of Critical Care Medicine, Antwerp University HospitalUniversity of AntwerpEdegemBelgium

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