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Objective To track the effects of hyperbaric oxygen (HBO) therapy on neonatal rats with hypoxic-ischernic brain damage (HIBD).MethodsA total of 126 healthy,seven-day-old SD rats were used to model the HIBD and then randomly divided into seven groups of 18:a sham group,a hypoxic-ischemic (HI) group,a 6 h HBO group,a 24 h HBO group,a 48 h HBO group,a 72 h HBO group and a 1 week HBO group.One hour of HBO treatment at 2 atmospheres absolute pressure was administered once daily for a week to the rats in the latter 5groups,starting at 6,24,48,72 hours and 1 week post the HIBD modeling,while no HBO was administered to the sham and HI groups.The effects were assessed in terms of histological changes ( the neuron density and the percentage of neuron apoptosis in the CA1 region of the hippocampus) and nitric oxide (NO),malondialdehyde (MDA) and superoxygen dismustase (SOD) concentrations after 15 days.ResultsIn the 6 h HBO,24 h HBO,48 h HBO and 72 h HBO groups,average neuron density in the CA1 region was significantly higher than in the HI group.But in the 1 week HBO group the average density was not significantly different than in the HI group.In the 6 h HBO,24 h HBO,48 h HBO and 72 h HBO groups the average percentage of neuron cell apoptosis in the CA1 area of the hippocampus was significantly lower than in the HI group,but the 1 week HBO group again showed no significant difference.There were significant differences in average NO,MDA or SOD levels among the 6 h HBO,24 h HBO,48 h HBO,72 h HBO and HI groups,but the 1 week HBO group showed no significantly higher average levels than the HI group.ConclusionsThe optimal therapeutic window for using HBO to protect against HIBD is within the first week.The best effect can be obtained in the first 6 hours,but after 1 week HBO no longer has a significant effect.The earlier the HBO is administered,the better the effect obtained.
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Objective To evaluate the effectiveness and safety of hyperbaric oxygen (HBO) therapy as an adjunctive therapy for children with dyskinetic cerebral palsy. Methods Seventy-one children with dyskinetic cerebral palsy aged 6 mouths to 2 years were randomly assigned to a HBO group ( n = 35 ) or a control group ( n = 36).All children were given conventional rehabilitative treatment, but the children in the HBO group in addition received 40 sessions of HBO therapy. HBO was administered for 1 h with 85% ～ 90% oxygen at 1.4 atmospheres absolute pressure. All the treatments in both groups continued for 8 weeks. Gross motor function was evaluated with a gross motor function measure ( GMFM ), global motor performance was assessed with a psychomotor development index (PDI), and intelligence was assessed with a mental development index (MDI). Clinical assessments were done before and after treatment. At the same time, hearing impairment was measured using brainstem auditory evoked potentials (BAEPs) in the HBO group. Results All outcomes in both groups improved significantly over the course of study. The average improvement in GMFM in the control group was significantly greater than in the HBO group but other differences were not statistically significant. Hearing impairment developed in 8 children treated with HBO.Conclusion There was no evidence that HBO therapy improved the condition of children with dyskinetic cerebral palsy, and there is a risk of side effects with HBO therapy.