Intrapelvic pressure

Intrapelvic pressure is measured by placing two catheters into the renal pelvis and bladder through a percutaneous nephrostomy tube at a rate of 10 ml / s. Contrast agent is injected at a rate of 10 ml / s. The pressure change in the renal pelvis when the contrast medium is infused is recorded under a fluorescent screen. Obstruction indicators such as renal pelvis pressure> 1.37kPa (1410cmH2O) indicate that there is obstruction. This method is helpful to determine whether there is obstruction in the pelvic ureteral junction, but it is more complicated and traumatic. It is rarely used clinically.