Abstract
The advent of the urodynamic approach to the study of fluid movement within the urinary tract permits objective study of the shape of the urethra. If the hydraulic parameters of voiding are known, the shape assumed by the urethra during that voiding can be correlated with these parameters, thereby imparting objective meaning to the radiographically recorded urethral shape. True urinary outflow estimation (1–3) requires the simultaneous measurement of bladder pressure (PB), equivalent exit pressure (PE), and urinary flow rate (F). Once these are known, resistance can be calculated from the equation The development of the pe meter (3) allows the simultaneous measurement of these parameters with synchronous radiographic recording of the urethral shape. The meter consists of a sensitive fluid-filled tambour mounted on an adjustable stand and set in a collecting system. The tambour which measures the force of the stream was calibrated against streams of known exit velocity. Measurement, then, of the force of t...
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