Pressure Measurements in Ileal Conduits

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Abstract
To study the dynamic properties of ileal conduits and to attempt to diagnose obstruction at an early point in time, that is prior to the development of conduit or upper urinary tract dilatation, a continuously perfused catheter technique was used to measure pressures within the conduit during filling and emptying, and to measure the resistance to flow at the stomal level. The mean values of residual urine, resting pressure, voiding pressure and stomal profile pressure were significantly higher in obstructed than in non-obstructed conduits. There was an overlap between values in each parameter, necessitating analysis of the entire pressure data in any given case. Even a small increase in residual urine above normal, 4.0 .+-. 0.9 cc, may be an indication of early obstruction and stomal caliber does not necessarily correlate with the degree of obstruction.