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Area of Science:

  • Biochemistry
  • Pediatric Critical Care Medicine
  • Cellular Biology

Background:

  • Sepsis in children can lead to organ dysfunction, but the role of mitochondria is not well understood.
  • Mitochondrial function is crucial for cellular energy production and survival.

Purpose of the Study:

  • To investigate mitochondrial respiration and content in children with sepsis.
  • To determine the association between mitochondrial alterations and organ dysfunction in pediatric sepsis.

Main Methods:

  • Prospective observational study in a pediatric intensive care unit (PICU).
  • Measured mitochondrial respiration and content in peripheral blood mononuclear cells (PBMCs) at different time points.
  • Assessed organ dysfunction using the Pediatric Logistic Organ Dysfunction (PELOD) score and organ failure-free days.

Main Results:

  • Children with sepsis showed lower maximal uncoupled respiration and spare respiratory capacity in PBMCs compared to controls.
  • Mitochondrial content (mtDNA/nDNA ratio) was higher in sepsis patients and increased with improving respiration.
  • Low spare respiratory capacity was associated with higher PELOD scores and predicted residual organ dysfunction at day 14.

Conclusions:

  • Pediatric sepsis is associated with acute decreases in PBMC mitochondrial respiration, alongside increased mitochondrial content.
  • While initial mitochondrial changes were not linked to organ dysfunction, persistent low respiration correlated with delayed recovery.
  • Mitochondrial function may serve as a biomarker for recovery from organ dysfunction in pediatric sepsis.