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Query: UMLS:C0403608 (ureter)
 9,655 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

To analyze the effect of chemical carcinogens on urothelial and intestinal mucosa on 214 female Wistar rats an ureterosigmoidostomy was performed. After 10-14 days 123 surviving rats were randomly divided into 4 groups: Group I-III received 0.05 per cent N-Butyl-N-(4-hydroxybutyl)-nitrosamine (BBN) in drinking water over a period of 15 weeks. Group IV received normal drinking water over the same period. The defunctionalized bladders were instilled each second day: Group I: physiologic saline solution, Group II: urine of normal rats, Group III and IV: urine of BBN-treated rats. 30 rats without diversion but BBN treatment served as a control. The evaluation of the histological data gave the following results: In the control group urothelial tumors were found in the bladder exclusively. Dependent on the grade of obstruction in the BBN-treated groups, with diversion urothelial tumors in the renal pelvis and ureter could be documented, whereas in the bladder no tumor growth could be shown. In the intestinal mucosa of BBN-treated animals a high incidence of adenocarcinoma was found. The chemical tumor induction by BBN is related to the urine and takes place by direct contact to the mucosa when the metabolites excreted by the kidneys are activated in the urine. BBN or other urogenic carcinogens seem to have no urothelial specificity. The incidence of bowel carcinoma after diversion must lead to intensive long-term follow up.
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PMID:Morphological changes of urothelial and intestinal mucosa after ureterosigmoidostomy during experimental urogenic carcinogenesis. 277 89

Neuropeptide Y (NPY) is widely distributed throughout the central nervous system and in several sympathetically innervated tissues, including the kidney. Although many central and peripheral acting endogenous compounds alter renal function, the role of NPY is unknown. Accordingly, we examined the effects of intracerebroventricular (ICV) or intrarenal administration of NPY on sodium and water excretion in the barbiturate anesthetized rat. Sprague-Dawley rats were uninephrectomized 10 days prior to testing and, in rats undergoing ICV administration, cannulae were implanted 3 days prior to testing. For testing, rats were anesthetized (Nembutal) and the jugular vein, renal artery and ureter catheterized. The results showed that the intrarenal infusion of NPY at 1 microgram/kg/min increased sodium and water excretion relative to the saline control group without altering blood pressure or creatinine clearance. Similarly, ICV administration of NPY at 10 micrograms in a 5 microliters volume increased the excretion of sodium and water without altering blood pressure as compared to the artificial CSF group. These findings suggest that both central and peripheral NPY may contribute to the regulation of sodium and water excretion in the rat.
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PMID:Effects of central and peripheral neuropeptide Y on sodium and water excretion in the rat. 281 60

We describe our new endoscopic procedure for correction of ureterovesical reflux by endoscopic injection of the patient's own heparinized blood behind the ureteral orifice. Before drawing out the needle, small amounts of thrombin and protamine were injected to prevent the injected blood from leaking. Of the 16 ureters treated (13 patients) with international grade I-III reflux, 9 showed complete absence of reflux. The technique is advantageous because it is technically simple and injection can be repeated until the reflux had disappeared. Furthermore, no complications such as distant migration of injected material or escape from the bladder mucosa have been observed. However, the treatment is not consistently successful in cases of high-grade reflux. After the operation, mucosal swelling of ureteral orifice and narrowing of the intramuscular ureter were observed by ultrasonography. The mean pressure of the intramuscular ureter increased 10 cm H2O after the operation. These consequences of the operation may prevent vesicoureteral reflux.
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PMID:Long-term results and curative mechanisms of vesicoureteral reflux by endoscopic injection of blood. 281 47

Bradykinin (BK) causes vasodilation and increases free water and sodium excretion in the kidney and stimulates smooth muscle contraction in the ureter and bladder. Several proposed sites of action for BK include the renal medullary collecting duct, renal blood vessels and the ureter and bladder smooth muscle. This study employs 3H-BK autoradiography to localize the sites of BK action. 3H-BK binding sites in the kidney are localized in the medullary interstitium where BK may produce prostaglandins which mediate its blood flow, natriuretic and diuretic effects. 3H-BK binding sites in the ureter and bladder are localized in the lamina propria below the basal epithelial layer and absent over the muscle layers suggesting an indirect action on urinary tract smooth muscle.
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PMID:3H-bradykinin binding site localization in guinea pig urinary system. 288 Apr 81

Forty-three patients with recurrent multiple superficial bladder tumours (Tis, Ta and Tl) were treated with Mitomycin C 20 mg in 20 ml water intravesically weekly for 8 to 12 weeks, and monthly instillations were continued for 5 to 6 months. Residual tumour was resected at 12 weeks, at which time 40 patients (93%) showed a response to treatment. A complete response was seen in 24 (56%) and 16 (37%) showed a partial response. After a follow-up of 12 to 48 months (median 19), 19 of 33 evaluable patients (58%) have shown tumour recurrence. Invasive tumour has developed in seven (17%) and transitional cell tumours of the ureter in two of those patients who showed an initial response to treatment.
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PMID:Intravesical mitomycin C for the treatment of recurrent superficial bladder tumours. 310 31

A new method for urinary diversion to the rectum was elaborated in animal experiments and currently has been used in 19 patients. Reflux of the rectal content to the colon and to the upper urinary tract is prevented by the fashioning of an intussusception valve at the rectosigmoid junction. The rectum is augmented by anastomosing an ileal patch to the anterior rectal wall. A transverse colostomy protects the construction for 6 to 8 weeks. Of the 19 patients 3 had local recurrence or metastasis within 6 months. Thus, 16 patients with a followup of 3 to 14 months are evaluable. All patients are continent during the daytime with an emptying frequency of 3 to 5 times and dry at night with a frequency of 0 to 2. In 3 patients partial sliding of the sigmoid intussusception valve occurred causing reflux of rectal contents to the sigmoid and to the right ureter in 1. Reflux to the upper urinary tract has not been revealed in any of the other patients. With 1 exception excretory urography has demonstrated either improvement or stabilization of the upper urinary tract post-operatively. The rectal capacity increased from 200 to 700 ml. after 6 months. With the reservoir full the mean basal pressure was 17 cm. water and the mean maximum pressure was 24 cm. water.
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PMID:Urinary diversion to the augmented and valved rectum: preliminary results with a novel surgical procedure. 319

We have developed a new method for urine collection in conscious, unrestrained rats through a chronic indwelling ureteral catheter, which allows direct differential sampling of small urine fractions over periods as small as 1 min. The technique was validated in intact and unilaterally nephrectomized rats by cumulative intravenous saline loading. Comparison of kidney with ureter catheter and contralateral kidney (urine collection from the bladder) revealed no differences in glomerular filtration rate and urine production between both kidneys. One week after catheter implantation in unilaterally nephrectomized rats, signs of renal functional disturbance as assessed by glomerular filtration rate, urine concentrating capacity after 24 h water deprivation, and plasma and urinary urea concentrations before and after water deprivation were not detected. Our technique provides a novel tool for direct measurements of short-term changes in urine composition in conscious animals.
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PMID:A new method for collecting urine directly from the ureter in conscious unrestrained rats. 324 94

Indirect mammo-lymphography with serial radiograms was made on rats bearing three established rat mammary carcinomas (SMT-2A, TMT-50, MT-W9B), with the water-soluble contrast medium, Iotasul. In the lymphogenously metastasizing SMT-2A, fine lymphatic sprouts from the tumor were seen converging into an afferent lymph vessel that was extending toward a metastatic regional lymph node, in 15-30 min. For 45 min, the dye remained localized in the primary tumor with no other vascular structures or viscera visible until it emerged in the urinary bladder, indicating that Iotasul was absorbed slowly into the systemic circulation via lymphatics and diluted beyond recognition by lymph and blood, and then reconcentrated in urine. In contrast, in the hematogenously metastasizing TMT-50, Iotasul was rapidly diffused into the blood stream, revealing the inferior caval vein within 5 min, and by 15 min the heart, aorta, common carotid arteries, kidney and ureter were all clearly revealed. In the non-metastasizing MT-W9B host, several small vascular markings around the tumor were seen by 10 min and the outline of kidneys and urinary bladder in 15 min, suggesting that the dye was also absorbed through blood capillaries but somewhat slowly. Thus, the differential vascular permeability in rat mammary tumors revealed by Iotasul has not only helped to distinguish lymphatics from blood vessels, but also to correlate it with their metastatic potential.
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PMID:Differential permeability of lymphatic and blood vessels in determining the route of metastasis as demonstrated by indirect lymphography. 335 12

The pelvic pressure was measured with a noninvasive technique in 7 pigs with a total unilateral obstruction of the ureter lasting 4 weeks. Pressure measurements were performed once a week. Although there was a wide pressure variation both intra- and interindividually during the 4 weeks, all systems had an elevated pressure (greater than 25 cm H2O) after 4 weeks. This study shows that the pelvic pressure can remain elevated in the chronically totally obstructed pyeloureter.
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PMID:Pelvic pressure measurements in the totally obstructed pyeloureter of the pig in 4 weeks. 337 57

It has been hypothesized that urea from the final urine is recycled into the renal papilla through the pelvic epithelium. To test this hypothesis, samples of urine were collected by micropuncture proximally and distally through the intact, contracting ureter of the anesthetized rat. In 12 rats, in which urine flow was 5.89 +/- 0.67 microliter/min (a moderate antidiuresis), the ratio of proximal-to-distal urea concentration, corrected for water movement, was 0.93 +/- 0.03 (P less than 0.01 compared with unity), indicating that approximately 7% of urea in the urine emerging from the terminal collecting duct was reabsorbed by the time it reached the distal ureter. To assess the possible contribution of urea reabsorption by the ureter, the ureter was cannulated proximally and distally and perfused with urine of known composition at 6.26 +/- 0.10 microliter/min. In nine rats, the ratio of urea concentration in the perfusate collected from the distal end of the ureter to that in the perfusate entering the proximal end was 0.93 +/- 0.02 (P less than 0.01 compared with unity), indicating 7% reabsorption. Movement of solute across the ureteral epithelium was not restricted to urea. Potassium and creatinine were also reabsorbed [3.4 +/- 0.9 (P less than 0.01) and 3.5 +/- 1.2% (P less than 0.05), respectively], whereas sodium was secreted [9.2 +/- 2.3% (P less than 0.01)].(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Urea flux in the ureter. 340 82


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