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Updated: Dec 24, 2025
A Piglet Model of Neonatal Hypoxic-Ischemic Encephalopathy
Published on: May 16, 2015
Short-term outcomes of remote ischemic postconditioning 1 h after perinatal hypoxia-ischemia in term piglets
Kasper J Kyng1, Sigrid Kerrn-Jespersen2, Kristine Bennedsgaard2
1Department of Paediatrics, Institute of Clinical Medicine, Aarhus University Hospital, Aarhus, Denmark. kasper.kyng@clin.au.dk.
Insights
Remote ischemic postconditioning (RIPC) reduced brain lactate levels after perinatal hypoxia-ischemia (HI) in piglets. However, RIPC did not improve brain structure, function, or survival at 72 hours.
Area of Science:
- Neonatal neuroscience
- Neuroprotection strategies
- Hypoxia-ischemia research
Background:
- Perinatal hypoxia-ischemia (HI) poses significant risks to newborns.
- Developing effective neuroprotective strategies for HI is critical.
- Remote ischemic postconditioning (RIPC) is being investigated for neuroprotection.
Purpose of the Study:
- To evaluate remote ischemic postconditioning (RIPC) as a neuroprotective intervention.
- To assess RIPC's effects following perinatal hypoxia-ischemia (HI) in a piglet model.
- To determine RIPC's impact on brain metabolism, structure, and neurological outcomes.
Main Methods:
- A piglet model of global hypoxia-ischemia (HI) was established.
- Fifty-four newborn piglets underwent 45 minutes of HI.
- RIPC (four 5-minute cycles) was administered 1 hour post-HI, with outcomes assessed at 72 hours.
Main Results:
- RIPC significantly reduced brain lactate/N-acetylaspartate (Lac/NAA) ratios overall and in the basal ganglia.
- No significant improvements were observed in diffusion-weighted imaging, neuropathology, neurological recovery, or mortality.
- The study utilized magnetic resonance spectroscopy for primary outcome measurement.
Conclusions:
- RIPC demonstrated a selective metabolic benefit by reducing lactate accumulation post-HI.
- RIPC did not provide short-term structural or functional neuroprotection at 72 hours.
- Further research is needed on RIPC timing, duration, and combination with hypothermia.
Background:
We aimed to assess remote ischemic postconditioning (RIPC) as a neuroprotective strategy after perinatal hypoxia-ischemia (HI) in a piglet model.
Methods:
Fifty-four newborn piglets were subjected to global HI for 45 min. One hour after HI, piglets were randomized to four cycles of 5 min of RIPC or supportive treatment only. The primary outcome was brain lactate/N-acetylaspartate (Lac/NAA) ratios measured by magnetic resonance spectroscopy at 72 h. Secondary outcomes included diffusion-weighted imaging and neuropathology.
Results:
RIPC was associated with a reduction in overall and basal ganglia Lac/NAA ratios at 72 h after HI, but no effect on diffusion-weighted imaging, neuropathology scores, neurological recovery, or mortality.
Conclusions:
The selective effect of RIPC on Lac/NAA ratios may suggest that the metabolic effect is greater than the structural and functional improvement at 72 h after HI. Further studies are needed to address whether there is an add-on effect of RIPC to hypothermia, together with the optimal timing, number of cycles, and duration of RIPC.
Impact:
RIPC after HI was associated with a reduction in overall and basal ganglia Lac/NAA ratios at 72 h, but had no effect on diffusion-weighted imaging, neuropathology scores, neurological recovery, or mortality. RIPC may have a selective metabolic effect, ameliorating lactate accumulation without improving other short-term outcomes assessed at 72 h after HI. We applied four cycles of 5 min RIPC, complementing existing data on other durations of RIPC. This study adds to the limited data on RIPC after perinatal HI and highlights that knowledge gaps, including timing and duration of RIPC, must be addressed together with exploring the combined effects with hypothermia.
