Intrapelvic pressure measurement

The intrarenal pressure was measured by placing two catheters into the renal pelvis and the bladder respectively. The contrast was measured by transcutaneous nephrostomy tube at a rate of 10 ml/s. The pressure difference between the renal pelvis and the bladder was measured as the kidney. Obstruction indicators such as renal pelvic pressure > 1.37 kPa (1410 cm H2O) indicate the presence of obstruction. This method is helpful for determining whether there is obstruction in the ureteropelvic junction, but it is less complicated and has less clinical application. Basic Information Specialist classification: urinary examination classification: urine / kidney function test Applicable gender: whether men and women apply fasting: not fasting Tips: Maintain normal sleep and diet. Normal value The relative pressure should be less than 12 cmHO. Clinical significance Abnormal results: The higher the pressure, the heavier the upper urinary tract obstruction. Helps the differential diagnosis of upper urinary tract obstruction. Obstruction of the ureteropelvic junction is a common urinary tract obstruction that causes hydronephrosis. The obstruction of the ureteropelvic junction obstructs the smooth discharge of renal pelvis into the ureter, which causes the renal pelvis to empty and causes the expansion of the collecting system of the kidney. At first, the smooth muscle of the renal pelvis gradually proliferates, strengthens the peristalsis, and attempts to discharge the urine through the distal obstruction; when the increasing amount of creeping power cannot overcome the obstruction, it will lead to atrophy of the renal parenchyma and impaired renal function. People who need to be examined: those with upper urinary tract obstruction. Precautions Taboo before check: Maintain normal sleep and diet. Requirements for examination: The patient should actively cooperate with the doctor and the doctor should check it carefully to avoid the result. Inspection process During the examination, the renal pelvis puncture should be performed percutaneously under fluoroscopy or ultrasound guidance, and a pressure measuring catheter should be placed. Because the pressure of the renal pelvis has a certain relationship with the intravesical pressure, it is necessary to simultaneously record the bladder pressure through the urethral cannula. After the renal pelvis is intubated, a pressure measurement is performed first, which is the resting pressure of the renal pelvis and the resistance of the catheter. Then, the physiological saline was perfused into the renal pelvis at a flow rate of 10 ml/s until the equilibrium state or the pressure was sharply increased. The perfusion pressure of the renal pelvis was recorded at this time, and the value of the renal pelvis and the bladder pressure were subtracted from the renal pelvis perfusion. Relative pressure, this value should be less than 12cmHO. The higher the pressure, the heavier the upper urinary tract obstruction. Helps the differential diagnosis of upper urinary tract obstruction. Not suitable for the crowd Inappropriate crowd: severe urinary tract infections. Adverse reactions and risks No related complications or hazards.