Abstract
The effect of hyperbaric oxygenation (OHP) on survival and quality of survival of guinea pigs afflicted with experimental allergic encephalomyelitis (EAE) was investigated. EAE was induced in Hartley and Strain 13 animals by intradermal injections of whole guinea pig spinal cord in complete Freund's adjuvant. The inoculated animals were divided into control and treatment groups; the treated animals received OHP in a variety of treatment schedules. Clinical signs of EAE were quantitated and mean survival times were measured. When Hartley animals were exposed to 100% O 2 at 2.5 atmospheres absolute (ATA) for 2 hr/day from 5–19 days postinoculation, the mean survival time (± SE) was 19.1 ± 1.6 days relative to 15.7 ± 0.7 days in the control ( p<0.050). When Strain 13 guinea pigs were treated with 100% O 2 at 2 ATA for 4 hr/day on 5–16 days, the mean survival time was 21.6 ± 0.6 days compared to 16.0 ± 0.4 days for the control ( p<0.001). Clinical sign measurements demonstrated that the onset of EAE in the treated animals of both strains occurred between 4–6 days after these signs became detectable in control animals. These results suggest that OHP therapy can ameliorate EAE in afflicted guinea pigs.
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