Protective effects of hydrogen on fetal brain injury during maternal hypoxia
Liu W et al. · Acta Neurochir Suppl. 2011;111:307–311.
Study at a glance
Preclinical
12 pregnant rats at gestational day 17 and their offspring
Maternal exposure for 4 hours to 2% H₂, 8% O₂ and 90% N₂ · 2% H₂ + 8% O₂ + 90% N₂.
Four consecutive hours during maternal hypoxia; offspring assessed through postnatal day 7
The article reports improved early functional-reflex measures with H₂. Brain weight and oligodendrocyte morphology and counts did not show clear group differences.
Only 12 pregnant rats, offspring clustered within dams, unusual severe hypoxic gas and short postnatal follow-up. It is not a clinical pregnancy study.
What kind of evidence is this?
Preclinical
Randomized pregnant-rat chamber experiment with postnatal functional follow-up
Women’s health
Other forms
Information not yet classified
Some editorial classification fields are still pending. The source-reported outcomes and result are shown below; Hydrogenology does not infer a positive or negative signal from prose automatically.
Methods
12 pregnant rats at gestational day 17 and their offspring
12 dams randomized to three groups; offspring-level numbers require further extraction
Four consecutive hours during maternal hypoxia; offspring assessed through postnatal day 7
Maternal exposure for 4 hours to 2% H₂, 8% O₂ and 90% N₂
H₂ diluted with O₂ and N₂ — not Brown’s gas.
2% H₂ + 8% O₂ + 90% N₂.
Room air and hypoxia gas containing 8% O₂ and 92% N₂
Outcomes and reported result
Body and brain weight, body-righting reflex, negative geotropism and oligodendrocyte morphology and counts
The article reports improved early functional-reflex measures with H₂. Brain weight and oligodendrocyte morphology and counts did not show clear group differences.
Gas composition, allocation, methods, figures and positive and null results checked in the free full text.
A reported association, difference or mechanism is not automatically a clinical benefit.
Limitations and applicability
Only 12 pregnant rats, offspring clustered within dams, unusual severe hypoxic gas and short postnatal follow-up. It is not a clinical pregnancy study.
Maternal hypoxia in pregnant rats and early postnatal offspring outcomes.
No single-study GRADE certainty rating is assigned. Read how records and evidence assessments are prepared.
Sources and record status
PMID: 21725773 · DOI: 10.1007/978-3-7091-0693-8_51
Free full text is available through PMC.
Open-access PMC article and PubMed record.
10 August 2026
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