Relationship between Perivesical and Intravesical Urinary Bladder Pressures and Intragastric Pressure

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Abstract
The intragastric pressure and the perivesical and intravesical urinary bladder pressures were measured in the supine and sitting positions immediately after micturition in 9 healthy men. The intragastric pressure was measured with an air‐filled rubber balloon, the perivesical pressure with an open liquid‐filled catheter inserted above the pubic bone into the space of Rezius and the intravesical pressure of the almost empty bladder with a catheter inserted supra‐pubically. There was no difference between the intragastric pressure level and the peri‐ and intravesical pressure levels in the supine position, but in the sitting position the peri‐ and intravesical pressure levels were higher than the intragastric pressure levels due to the pressure effect of the viscera. There was no difference between perivesical and intravesical pressure levels in either the supine or sitting position. Rapid pressure change produced by straining or coughing produced a smaller pressure increase peri‐ and intravesically than intragastrically due to delayed pressure equilibration because of inhomogeneity of the abdominal contents.

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