THE EFFECT OF EXPLOSIVE DECOMPRESSION ON CEREBROSPINAL FLUID PRESSURE

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Abstract
The effect of both slow and explosive decompression on cerebrospinal fluid pressures of anesthetized dogs has been measured by means of a closed optical manometer system. Decompressions to 141 mm. Hg (40,000 ft.) in about 10 mins. resulted in an average rise of 3.0 mm. Hg which persisted as long as the reduced pressure was maintained. Explosive decompression from a pressure of 522 mm. Hg (10,000 ft.) to one of 141 mm. Hg (40,000 ft.) in 0.01 or 0.08 second resulted in pressure rises of 22.5 mm. Hg and 11.6 mm. Hg, respectively, which persisted for only 1.5 secs. No bubbles or evidences of bubble formation were observed in the course of these expts. The rise in cerebrospinal fluid pressures is considered to be a reflection of a similar rise in the intrathor-acic pressure.

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