Document Detail

Impact of a double-pigtail stent on ureteral peristalsis in the porcine model: initial studies using a novel implantable magnetic sensor.
MedLine Citation:
PMID:  15798413     Owner:  NLM     Status:  MEDLINE    
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.
Ramakrishna Venkatesh; Jaime Landman; Scott D Minor; David I Lee; Jamil Rehman; Richard Vanlangendonck; Maged Ragab; Kevin Morrissey; Chandru P Sundaram; Ralph V Clayman
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of endourology / Endourological Society     Volume:  19     ISSN:  0892-7790     ISO Abbreviation:  J. Endourol.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-03-30     Completed Date:  2005-05-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8807503     Medline TA:  J Endourol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  170-6     Citation Subset:  IM    
Division of Urology, Washington University School of Medicine, St. Louis, Missouri, USA.
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MeSH Terms
Models, Animal
Muscle Contraction / physiology*
Muscle, Smooth / physiology*
Silicone Elastomers
Ureter / physiology*
Reg. No./Substance:
0/Polyurethanes; 0/Silicone Elastomers

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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