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KMID : 0351619670080010141
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Kyungpook Medical Journal
1967 Volume.8 No. 1 p.141 ~ p.146
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Steady State Pressure and Gas Composition in Non-collapsible Gas Pocket in Rabbit
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Abstract
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It is of interesting and worth while to know the behavior of non-collapsible gas pockets in the body, i. e., the middle ear cavity or paranasal cavity, particularly when their ducts are occluded. A non-collapsible gas pocket is produced on the back of rabbit by implanting a capsule, having two tubings, 1cm in diameter and 10cm in length, which is made by covering nylon cloth on a spirally wound stainless wire. The negative pressure created in the non-collapsible gas pocket, after filling it with pure CO₂ and closing the opening, was measured at the definite interval of time until the steady state pressure was reached. and also a test gas, whose partial pressure of CO₂ and O₂ are close to those of the blood, was filled into the non-collapsible gas pocket as well into a collapsible gas pocket made on the other side of the back. The gas compositions in the both gas pockets were determined at the six hours after filling the gas.
The results obtained are summerized as follows :
1. when the non-collapsible gas pocket is filled with the pure CO₂ and closed off from the at mosphere, the pressure within the pocket is decreased almost linearly up to one hour and thereafter the rate of change of the pressure is decreased gradually and levels off after about two hours. The maximal negative pressure attained after the steady state are ranged 20 to 30 cm H₂O.
2. The gas composition in the both, non-collapsible and collapsible gas pocket at the steady state, i. e., six hours after introduction of the test gas, is : CO₂, 8.8% : O₂, 1.7 % for non-collapsible gas pocket and CO₂, 6.7% ; O₂, 4.3% for the collapsible gas pocket. The differences in concentration of CO₂ and O₂ between the both pockets are significant respectively.
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