Document Detail

Assessment of internal ureteral stent patency in patients with pyelocaliectasis: value of renal duplex sonography.
MedLine Citation:
PMID:  8517329     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The purpose of this study was to evaluate duplex Doppler sonography in the assessment of internal ureteral stent patency. SUBJECTS AND METHODS: Thirty-three kidneys with pyelocaliectasis and an internal stent were studied with Doppler sonography and conventional sonography. Stent patency was proved by subsequent contrast-enhanced studies, direct inspection of the stent after removal, or clinical follow-up. RESULTS: The 11 kidneys with stent dysfunction had a significantly higher mean resistive index (0.78 +/- 0.08) than the 22 kidneys with patent stents (resistive index = 0.62 +/- 0.05) (p < .001). Eighty-two percent (9/11) of kidneys with occluded stents had elevated resistive indexes. The two occluded stents with normal resistive indexes were found in kidneys without significant obstruction before stent placement. Ninety-one percent (20/22) of patent stents were associated with a resistive index of less than 0.70. In the two cases of falsely elevated Doppler studies, the resistive index was obtained only 24-36 hr after placement of the stent; however, the resistive index was at least 10% less than that before stent placement. No significant correlation existed between degree of pyelocaliectasis shown on real-time sonography and stent status. CONCLUSION: In the presence of pyelocaliectasis after placement of an internal ureteral stent, intrarenal Doppler sonography can be used to accurately distinguish between patency and obstruction. Real-time sonographic findings (degree of pyelocaliectasis) are not useful in this clinical situation.
J F Platt; J H Ellis; J M Rubin
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  AJR. American journal of roentgenology     Volume:  161     ISSN:  0361-803X     ISO Abbreviation:  AJR Am J Roentgenol     Publication Date:  1993 Jul 
Date Detail:
Created Date:  1993-07-22     Completed Date:  1993-07-22     Revised Date:  2010-03-24    
Medline Journal Info:
Nlm Unique ID:  7708173     Medline TA:  AJR Am J Roentgenol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  87-90     Citation Subset:  AIM; IM    
Department of Radiology, University of Michigan Hospitals, Ann Arbor 48109-0030.
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MeSH Terms
Aged, 80 and over
Dilatation, Pathologic / ultrasonography
Kidney Calices / pathology,  ultrasonography
Kidney Pelvis / pathology,  ultrasonography*
Middle Aged
Prospective Studies
Ureter / ultrasonography*
Ureteral Obstruction / therapy,  ultrasonography

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