Visual Evoked Potential Changes in Hyperbaric Atmospheres.
ARIZONA STATE UNIV TEMPE
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The visual evoked potential VEP in chloralose-anesthetized cats decreased in amplitude as a function of increasing pressure. This was true for compression with pO2 200 or 1,000 mm Hg. Maintained pressure while changing pO2 from p2 from 200 to 1,000 mm Hg or from 1,000 to 200 had little effect. If pO2 1,000 mm Hg had been used in a session, variability in VEP measurements was extremely high, i.e., the VEP amplitude dropped to zero at 100 FSW for some cats, while other cats showed little effect at 500 feet of sea water equivalent FSW. Limited information on decompression indicates the VEP may be recovered from its depressed state at 500 FSW by slow decompression. Rapid decompression results in the VEP remaining depressed or being reduced in amplitude even further. The VEP was not a reliable index for determining decompression stops. Author
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