What are the causes of ureteral obstruction

summary

Some patients will have ureteral obstruction, which has a great impact on the normal urination, but also for the normal function of the kidney will cause certain infection, so we must find the reason for better treatment, let's talk about the causes of catheter obstruction.

What are the causes of ureteral obstruction

First, ureteropelvic junction obstruction is a common urinary tract obstruction disease causing hydronephrosis. The obstruction of ureteropelvic junction hinders the smooth discharge of urine from the pelvis into the ureter, resulting in the obstruction of emptying of the pelvis and the expansion of the collecting system of the kidney. At first, the smooth muscle of the renal pelvis gradually proliferates, strengthens peristalsis, and tries to excrete urine through the distal obstruction.

Second: when the increasing peristaltic force can not overcome the obstruction, it will lead to renal parenchyma atrophy and renal function damage. The main internal factors in the lumen were UPJ stenosis, valves, polyps and high ureteral orifice. Among them, stenosis was the common cause of UPJ obstruction (87.2%), mainly manifested as hypertrophy of muscular layer and hyperplasia of fibrous tissue at UPJ.

Third, the most common cause is the vagal or accessory vessels supplying the lower pole of the kidney from the main renal artery or abdominal aorta (Fig. 3), which cross the UPJ to make it compressed and make the ureter or renal pelvis hang above the vessels. In addition, there are fibrous cord compression or adhesion, resulting in UPJ tangled twist or high attachment functional obstruction, performance of dynamic dysfunction of UPJ. The characteristic of UPJ is that there is no obvious intraluminal stenosis and extraluminal compression factor, the ureteral catheter can pass smoothly during retrograde urography, but there is obvious hydronephrosis.

matters needing attention

Sometimes the phenomenon of hydronephrosis in the kidney will lead to ureteral obstruction. For a long time, the body of patients will have different problems, which will directly affect the health of patients. Patients must go to the hospital for examination as soon as possible, and then choose the most appropriate scheme.