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High oxygen pressure-induced convulsions in suckling mice
The Chinese Journal of Physiology
|December 31, 1975
Summary
Hyperoxic convulsions in suckling mice develop functionally between 13-16 days of age. This maturation period is critical for understanding oxygen toxicity mechanisms in young mammals.
Area of Science:
- Developmental Biology
- Physiology
- Toxicology
Background:
- Hyperoxia, or exposure to elevated oxygen levels, poses risks to developing organisms.
- Understanding the onset of oxygen toxicity is crucial for neonatal care and research.
Purpose of the Study:
- To determine the developmental timeline for the functional maturation of the hyperoxic convulsion mechanism in suckling mice.
- To investigate the age-dependent incidence of pulmonary damage induced by hyperoxia.
Main Methods:
- A cohort of 200 suckling mice across 20 litters was exposed to high-pressure oxygen.
- Convulsion incidence was recorded daily from 1 to 16 days of age.
- Pulmonary damage was assessed, with incidence correlated to age.
Main Results:
- Mice aged 1-12 days did not exhibit convulsions under hyperoxic conditions.
- Convulsions were observed in 10% of 13-day-old, 30% of 14-day-old, 80% of 15-day-old, and 100% of 16-day-old mice.
- Hyperoxia-induced pulmonary damage increased with the age of the suckling mice.
Conclusions:
- The functional maturation of the hyperoxic convulsion mechanism in mice occurs between 13 and 16 days of postnatal life.
- Hyperoxia can induce pulmonary damage in a manner that is age-dependent in suckling mice.