Relevant phase conditions for predicting occurrence of decompression sickness.

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Abstract
An experiment has been designed to determine whether phase equilibration or limited supersaturation is the relevant thermodynamic state of the critical tissue type to be considered in predicting the occurrence of decompression sickness. The total decompression times of 5 goats were titrated individually for direct surfacing from pressures equivalent to 10, 20, and 30 ft., apart from 2 of the animals which developed symptoms on reaching 10 ft. by the standard schedule employed. For the others time spent at the normal 10-ft. last stop of a conventional decompression format, based on the concept of limited supersaturation, can be employed more effectively if allotted to the 20-ft. stop. This would indicate that the gas phase is present during the popular Haldanian type of decompression so that the mathematical basis of such calculation methods would then be inconsistent with the physics of the system.

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