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

The control of ureteral peristaltic contractions by a pacemaker system is shown in a series of experimental observations on the anesthetized dog. Data are presented to illustrate the influence of pacemaker frequency on ureteral rate and bolus volume during oliguria and transient diuresis. Pacemaker frequency was determined from the pressure wave form of the renal pelvis and peristaltic rate was measured electrophysiologically. The bolus volume associated with each peristaltic contraction was recorded by a drop counter and correlated with pacemaker and ureteral activity. The results show that the pacemaker frequency remains constant over urine flow rates in the range of 0.3 to 15 ml per min. It is also shown that the pacemaker frequency is constant during transient increases in flow rate of more than one order of magnitude. During diuresis, the peristaltic rate changes in quantum steps determined by the fundamental frequency of the pacemaker, and at flow rates greater than 2 ml per min the ureter contracts at the pacemaker rate. Further increases in flow are accommodated by increasing the amount of urine transported by each bolus. The urologic importance of these observations on pacemaker function is discussed in terms of the unicalyceal and multicalyceal upper urinary tract.
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PMID:Urodynamics of the upper urinary tract. 99 77

Total ureteropelvic necrosis of the transplanted kidney occurred more than one month after transplantation in 5 of 575 consecutive renal transplants performed at the University of Minnesota Hospital since 1963. Necrosis became evident long after normal renal function had been established. Histologic signs of rejection were minimal, but perinephric or periureteral hematomas were found in 3 of 5 patients: post-transplant acute tubular necorsis requiring hemodialysis occurred in all. The pathogenesis of this complication probably involves (1) a primary deficit of blood supply from the renal vessels to the pelvis and ureter, (2) a failure to develop a new ureteral blood supply because of surrounding hematoma, (3) early swelling of the ischemic ureter resulting in oliguria interpreted as acute tubular necrosis, (4) resolution of edema resulting in diuresis, and (5) late patchy ureteral necrosis and fistula formation due to ureteral ischemia.
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PMID:Late ureteropelvic necrosis after transplantation. 109 Oct 63

A 66-year-old man with the chief complaint of oliguria had been referred to our hospital under the diagnosis of bilateral hydronephrosis and abdominal aortic aneurysm by his family doctor. CT scan and digital subtraction angiography demonstrated an abdominal aortic aneurysm continuing to bilateral internal iliac arteries. The degree of right hydronephrosis was less advanced compared to the left side. Right percutaneous nephrostomy was performed because the retrograde stenting was unsuccessful. After the renal function improved, an operation for the aneurysm was undertaken in the surgical department. Although bilateral ureterolysis was possible, the resection of the aneurysm could not be done. After clamping the nephrostomy catheter, drainage of urine into the ureter was not seen one month after the operation. A double-J ureteral stent was inserted by the antegrade approach and the nephrostomy tube was removed. By exchanging the stent every 3 months, the renal function has been stable and the size of the aneurysm unchanged during the 25 months after the surgery.
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PMID:[Bilateral ureteral obstruction secondary to aneurysm of abdominal aorta: a case report]. 160 68

We report two cases of urinary diversion through an appendix. Case 1. An 81-year-old man was hospitalized with oliguria. The patient had a past history of left nephro-ureterectomy for left ureteral tumor. Ultrasound showed right hydronephrosis due to recurrence in the bladder and right ureter. A total cystectomy and partial ureterectomy were carried out, and an appendix conduit was constructed because the ureter was not sufficiently long for ureterocutaneostomy. Case 2. A 68-year-old woman with diabetic neurogenic bladder, hypothyroidism, and chronic obstructive lung disease was hospitalized with the complaint of difficulty in self-catheterization. Continent vesicostomy was carried out according to the method of Mitrofanoff using the appendix. Both patients were tubeless and without postoperative complications before discharge. Appendix conduit and Mitrofanoff operation, which can be performed by a simple surgical procedure, are considered to be applicable to poor risk cases.
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PMID:[Urinary diversion using an appendix: a report of two cases]. 185 92

Electromyogram (EMG) and bolus volume of ureteral peristalsis were measured during gradual and rapid urinary flow increase in mongrel dogs. In acute diuresis induced by furosemide, the ureteral peristaltic rate rose and then the bolus volume increased with a consequent increase of urine flow. During a course of gradually increasing urine secretion, the ureter showed varying responses in respect to peristaltic rate (i.e., increase, no change and decrease) but changes in the bolus volume consistently made up for the rate alterations, thereby eventually maintaining an efficient equilibrium of these two urodynamic parameters to effect an increase in urine flow. The ureteral peristaltic rate increases only several times in polyuria as compared to the rate in oliguria, whereas the bolus volume of urine increases by a factor of 100. This indicates that it is not so much the ureteral peristaltic rate as the bolus volume which plays a principal part in the transport of urine through the ureter.
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PMID:The role of ureteral peristaltic rate and bolus volume on increasing urine flow. 375 May 77

We report on 8 azotemic patients with anuria or progressive oliguria owing to bilateral uric acid lithiasis. In 7 patients the precipitating cause of acute obstructive renal insufficiency was choking of at least 1 distal ureter with numerous small uric acid stones. In 6 of these ureters contrast retrograde ureterography showed relief of obstruction, which was believed to be owing to the stone dissolution properties of the contrast medium used. In situ alkalization via nephrostomy catheters achieved dissolution of obstructing stones in 3 tracts and systemic alkalization dissolved the stones in 3 others. An operation was necessary in 4 cases of large calculi, all of which showed some radiodensity, either because of super added calcification or phosphatic incrustation, rendering dissolution unfeasible. Methods of management of the obstructed tract caused by uric acid stone disease are evaluated and discussed.
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PMID:Management of the choked ureter in obstructive renal failure due to uric acid lithiasis. 710 85

Primary renal candidiasis is an uncommon disorder. It typically presents as urinary tract obstruction secondary to bezoar in the ureter, progressive oliguria (at times alternating with episodes of diuresis), ureteral colic, passage of tissue- or stone-like material, pyuria, and/or progressive renal failure. The patient described here presented with gross and microscopic hematuria. In our literature review, we found neither of these reported as clinical signs of primary renal candidiasis. With the widespread use of drugs (eg, antibiotics, antineoplastic chemotherapeutic agents, systemic corticosteroids) which facilitate the growth of Candida, primary renal candidiasis should be considered in the patient who presents with hematuria.
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PMID:Gross hematuria: a rare manifestation of primary renal candidiasis. 735 38

We report a 26-month-old child diagnosed with prune-belly syndrome and end-stage renal disease who received intraperitoneal implantation of an adult cadaveric renal graft which functioned very well for approximately 6 weeks. The patient then presented with acute renal failure which was proved to be secondary to torsion of the graft, twisting the artery and vein. The ureter was wrapped 360 degrees around the graft. These conditions resulted in loss of the graft and nephrectomy. Ours is the second report of such an occurrence; the first was from a living-related kidney donor. We believe the lack of abdominal wall tone contributes to graft mobility and risk of torsion of the kidney. We recommend that nephropexy be considered in these patients. In addition, the risk of torsion must be at the forefront of the differential diagnosis in a prune-belly renal transplant patient with acute onset of oliguria. Renal sonography with Doppler should be employed as soon as possible so that the graft can be saved.
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PMID:Renal allograft torsion associated with prune-belly syndrome. 774 30

The necessity for preoperative ureteral catheter insertion for colorectal operations continues to be controversial. To determine our experience and what complications might be associated with ureteral catheter use, the charts of all patients in our department undergoing ureteral catheterization in combination with colorectal procedures between the years 1978 and 1989 were reviewed. The indications for operation, the presence or absence of urinary tract symptoms, and intravenous pyelogram findings (if performed) were recorded. Time for the procedure, size and number of catheters, and complications were noted. From the operative report, a retrospective grading of necessity for ureteral catheterization was assessed according to a scale from A to D. There were 120 ureteral catheterizations performed, bilaterally in 60 per cent of cases. Complications included renal colic (1), oliguria (1), and anuria (2). Intraoperatively, one ureter was cut and one ureter tied but recognized by palpation and ligature removed. Retrospective grading deemed ureteral catheterization necessary in 27.5 per cent of cases. We conclude that catheters are helpful in selected cases. For patients with bilateral catheter insertion, complications can be reduced by ensuring urine output prior to removal of the second catheter.
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PMID:The prophylactic use of ureteral catheters during colorectal operations. 811 85

Presentation of a case report of a female patient with single right kidney and background of left nephrectomy 21 years earlier due to hypertension who presented to the clinic after an episode of oliguria with lower limbs oedema and renal failure. Renal ultrasound evidenced moderate hydronephrosis, and backward pyelography showed medialization and lumbar ureter compression. CAT examination confirmed the ureteropyelocalycectasis as well as the reduction of the infrarenal lower cava vein to a fibrous cord with internal calcification. Axillary cavography and venography through both femorals demonstrated absence of the infrarenal cava vein segment and existence of a large replacement venous network. During surgery it became evident that the latter was displacing a retrovenous right lumbar ureter medially. Ureterolysis and ureter section with transposition, and termino-terminal anastomosis were performed. The morphological and functional results were excellent with recovery of the renal function (normal serum creatinine) which is still maintained after 7 years follow-up. As a consequence of this case, a review was made of different cava vein anomalies with repercussion in the urine excretory tract.
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PMID:[Ureteral obstruction caused by periureteral venous dilatation secondary to infrarenal caval obstruction]. 876 4


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