Morphological dynamics of ureteral transport. II. Peristaltic patterns in relation to flow rate

Ohlson, Lars

doi:10.1152/ajpregu.1989.256.1.r29

Cited by 11 publications

(11 citation statements)

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“…There are few reported studies on the effects of indwelling ureteral stents on ureteral peristalsis. [2][3][4][5][6][7] In vitro studies measuring the ureteral smooth-muscle activity have had limited clinical applicability because of the difficulty in correlating evaluations of in vitro models with an intact in vivo ureter.…”

Section: Introduction Dmentioning

confidence: 99%

Impact of a Double-Pigtail Stent on Ureteral Peristalsis in the Porcine Model: Initial Studies Using a Novel Implantable Magnetic Sensor

Venkatesh

Landman

Minor

et al. 2005

Journal of Endourology

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Background and Purpose:The effect of stents on ureteral peristalsis in vivo is not entirely clear. We sought to develop a minimally invasive method for its study. Materials and Methods:In female domestic pigs, electrical potentials from the ureter were measured by bipolar steel-wire electromyography electrodes delivered laparoscopically. Mechanical movement was measured by giant magneto resistive sensors mounted on custom-made aluminum strips. After baseline values were obtained, the animals were randomized to receive silicone or polyurethane stents, and ureteral peristalsis was measured for 8 hours acutely and for 4 hours 1 week later.Results: Implantation of the devices took an average of 30 minutes. A consistent correlation was found between laparoscopically observed peristaltic waves and the peristalsis detected by the two measuring devices. The devices themselves did not affect peristalsis. Stent insertion increased peristaltic activity initially but later reduced or stopped it. There was no difference in the effects of the two types of stents.Conclusions: The new technique permits close monitoring of ureteral peristalsis in vivo. Smaller stents appear to have less immediate effect than larger ones, but all type of stents tested eventually caused aperistalsis.

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Section: Introduction Dmentioning

confidence: 99%

Impact of a Double-Pigtail Stent on Ureteral Peristalsis in the Porcine Model: Initial Studies Using a Novel Implantable Magnetic Sensor

Venkatesh

Landman

Minor

et al. 2005

Journal of Endourology

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“…These are the total filling state of the organ, peristaltic movement, as well as stenoses in the ureters, the pyelo-ureteral junctions, or the lower excretory tract [27,28]. In the present collection of patients without known abnormalities of the ureter, depiction was achieved approximately in 80 % of cases.…”

Section: Discussionmentioning

confidence: 65%

Opacification of the urinary tract in portal venous spiral CT without delayed scans

et al. 1999

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In portal venous spiral CT there is no visible renal contrast excretion within the usual period of scanning. To opacify collecting systems additional delayed scanning is required. We administered an extra pre-dose of contrast medium before the main portal venous bolus in order to opacify the urinary tract and studied its effects on liver attenuation. In 32 patients examined first by non-contrast spiral CT 20 ml of a non-ionic IV CM were injected. Five minutes later, orientating cuts in the liver and along the urinary tract were obtained. Immediately thereafter, a 120-ml bolus was administered at 3 ml/s for portal venous phase helical CT (60-s delay craniocaudad). The quality of renal excretion was graded visually (excellent, fair, poor, none). Hepatic attenuation measurements were performed at comparable regions of interest. In all patients 20 ml CM opacified the renal pelvis after 5 min. Depiction of the ureters was excellent in 14, fair in 11 and poor or none in 7 cases. There was little effect on mean hepatic attenuation by the 20-ml pre-bolus after 5 min: mean enhancement 2.3 HU (range -0.6 to 7.8 HU). Mean hepatic enhancement after the 120-ml portal venous bolus ranged between 23.6 and 74.1 HU (mean 51.5 HU). When opacification of the urinary tract is necessary, pre-administration of a 20-ml bolus 5 min before portal venous scanning may save an extra delayed spiral. The effects on hepatic enhancement are negligible.

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“…Thus an equal amount of urine flow rate can be transported per unit time at a lower fre quency because the renal pelvis is of larger diameter and hence the bolus is larger. Given that in multicalyceal pel vis the frequency of peristaltic contraction is equal to that of the ureter throughout its length [6,7] these observa tions indicate that the effect of thiphenamil HC1 would continue down the entire upper urinary tract [8,9]. How ever, the limitations of ultrasound in resolution and the anatomical complexities preclude the visualization of the ureter at regions past the renal pelvis.…”

Section: Discussionmentioning

confidence: 97%

Relaxant Effect of Thiphenamil HCI on Upper Urinary Tract Frequency of Contraction of Healthy Asymptomatic Volunteers

Constantinou

1992

Urol Int

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The pharmacologic effect of thiphenamil HCI on the upper urinary tract as a relaxant of renal pelvic contractions was studied. A total of 17 subjects with no known upper urinary tract abnormalities were scanned. A Diasonics ultrasound scanner at 3.5 MHz was used to visualize the kidney and renal pelvis with the subject in the supine position. Control recordings of renal pelvic and calyceal contractility were made on videotape for approximately 30 min. The subject was then given a single dose of 400 mg thiphenamil HCI and visualization of contractility continued for approximately 60-90 min. Criteria for the evaluation of the data were the mean frequency of pelvic contraction cross-section of the pelvis, and velocity and direction contraction. Ultrasonic images were filtered by a video filtering process and averaged using the digital conversion and summation in real time. The results show that under control conditions renal pelvic contractions are at a frequency of 2 ± 1.8 min-1. Contractions are initiated with the intrarenal pelvis and continue towards the ureter at a rate of 1.3 ± 0.8 cm/s. Following thiphenamil HCI, there is a significant reduction in pelvic contraction frequency, 0.6 ± 0.6 ∏ikr’, and the opposing walls of the renal pelvis do not completely close in the formation of a bolus. The results obtained from this study demonstrate that thiphenamil suppresses upper urinary tract contractility. As a consequence of this observation, it is postulated that this agent may be of use in the acute relaxation of the upper urinary tract for renal colic and stone management.

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Morphological dynamics of ureteral transport. II. Peristaltic patterns in relation to flow rate

Cited by 11 publications

References 0 publications

Impact of a Double-Pigtail Stent on Ureteral Peristalsis in the Porcine Model: Initial Studies Using a Novel Implantable Magnetic Sensor

Impact of a Double-Pigtail Stent on Ureteral Peristalsis in the Porcine Model: Initial Studies Using a Novel Implantable Magnetic Sensor

Opacification of the urinary tract in portal venous spiral CT without delayed scans

Relaxant Effect of Thiphenamil HCI on Upper Urinary Tract Frequency of Contraction of Healthy Asymptomatic Volunteers

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