2019 · Htun — Hydrogen ventilation combined with mild hypothermia improves short-term neurological outcomes in a 5-day neonatal hypoxia-ischaemia piglet model.
Super-Abstract
In newborn piglets that had suffered hypoxic-ischaemic brain injury (a model for birth asphyxia), combining therapeutic hypothermia with hydrogen (H₂) ventilation produced better neurological recovery scores than hypothermia alone over 5 days. The H₂+hypothermia group also showed a trend toward improved cortical and white-matter histology and less cell death. These findings suggest H₂ may add benefit on top of the current standard of care for neonatal hypoxic-ischaemic encephalopathy — but in a piglet model only. (Scientific Reports, 2019.)
Commentary
Therapeutic hypothermia is the only evidence-based treatment for moderate-to-severe neonatal hypoxic-ischaemic encephalopathy (HIE), but it only partially protects — about 40–50 % of treated infants still die or survive with disability. The search for adjunctive neuroprotective agents is therefore clinically urgent. H₂ has antioxidant and anti-apoptotic properties that are mechanistically complementary to hypothermia. This piglet model is considered a reasonable translational model for neonatal HIE because pig brain myelination and development are closer to human neonates than rodent models. The neurological scoring showed significantly better outcomes in TH-H₂ from day 3 onward, and H₂-treated animals walked earlier. Histological benefits were a trend rather than statistically significant. Limitations: small groups (exact n not stated per group in the abstract), only 5-day assessment (a very short window for neurological outcome), and no blinded outcome assessment is mentioned. This is preliminary encouraging data, not a basis for clinical use.
Key quotes
- „The piglets in the TH-H2 group consistently had the highest score from day 2 to 5 and showed a significantly higher neurological score from day 3 compared with the NT group.“ — neurological recovery was best in the combined H₂+hypothermia group
- „Most piglets in the TH-H2 group could walk at day 3 of recovery, whereas walking ability was delayed in the two other groups.“ — functional motor recovery was faster with H₂+hypothermia
- „TH-H2 tended to improve the status of cortical gray matter and subcortical white matter, with a considerable reduction in cell death.“ — histological trend toward better brain tissue preservation (not statistically confirmed)
Our assessment
A preclinical piglet study — promising but far from clinical evidence. The piglet model is more translatable to human neonates than rodent models, which gives these findings somewhat greater translational weight. However, the study is small, short, and does not address long-term neurodevelopmental outcomes. No human neonates were studied. Therapeutic hypothermia combined with H₂ ventilation would require dedicated neonatal clinical trials before any application can be considered. The result is a meaningful signal for further research, not a treatment recommendation.
Study design
- Type: preclinical randomized animal study · Model: neonatal piglets, hypoxic-ischaemic brain injury model (3 groups: normothermia/NT, hypothermia/TH at 33.5 °C, hypothermia+H₂/TH-H₂) · H₂ delivery: 2.1–2.7 % H₂ ventilation for 24 h concurrent with therapeutic hypothermia
- Result: significantly higher neurological scores from day 3 in TH-H₂ vs. NT; earlier walking recovery in TH-H₂ group; histological trend toward better cortical and white-matter preservation with reduced cell death in TH-H₂ (trend, not statistically significant)
Abstract
Despite its poor outcomes, therapeutic hypothermia (TH) is the current standard treatment for neonatal hypoxic-ischaemic encephalopathy (HIE). In this study, due to its antioxidant, anti-inflammatory, and antiapoptotic properties, the effectiveness of molecular hydrogen (H2) combined with TH was evaluated by means of neurological and histological assessments. Piglets were divided into three groups: hypoxic-ischaemic insult with normothermia (NT), insult with hypothermia (TH, 33.5 ± 0.5 °C), and insult with hypothermia with H2 ventilation (TH-H2, 2.1-2.7%). H2 ventilation and TH were administered for 24 h. After ventilator weaning, neurological assessment was performed every 6 h for 5 days. On day 5, the brains of the piglets were harvested for histopathological analysis. Regarding the neurological score, the piglets in the TH-H2 group consistently had the highest score from day 2 to 5 and showed a significantly higher neurological score from day 3 compared with the NT group. Most piglets in the TH-H2 group could walk at day 3 of recovery, whereas walking ability was delayed in the two other groups. The histological results revealed that TH-H2 tended to improve the status of cortical gray matter and subcortical white matter, with a considerable reduction in cell death. In this study, the combination of TH and H2 improved short-term neurological outcomes in neonatal hypoxic-ischaemic piglets.
Source & links
Screenshot of the PubMed page
This page mirrors the published abstract (© the authors / publisher) for reference and citation. The canonical source is the PubMed record linked above. This is not medical advice.