Computed tomography-determined stone-free rates for ureteroscopy of upper-tract stones

Amanda MacEjko, Onisuru T. Okotie, Lee C. Zhao, Jonathan Liu, Kent T Perry Jr, Robert B Nadler

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Background and Purpose: Most series on ureteroscopy for urolithiasis use postoperative plain radiography of the kidneys, ureters, and bladder (KUB) or intravenous urography (IVU) to determine outcomes. These imaging modalities, however, are not very sensitive and may overestimate stone-free rates (SFRs). The aim of our study was to assess SFRs after ureteroscopy for urolithiasis using CT follow-up. Patients and Methods: A total of 92 patients underwent 113 ureteroscopic procedures for either renal or ureteral stones. Success of ureteroscopy was then determined by the absence of any stone fragments (stone-free). Stone-clearance rates (SCRs) were also calculated for ≤2mm and ≤4mm residual stone fragments. Results: Each renal unit contained a mean of 1.87stones with a mean stone diameter of 8± 6mm. The overall SFR was 50.4%. SFRs were significantly higher for ureteral stones (80%) than renal stones (34.8%) (P= 0.0001). Renal units with multiple stones were less likely to be stone free than those with single stones (P= 0.011). No difference in SFRs was found between lower pole and non-lower-pole stones. Conclusions: Overall SFRs by CT were lower than SFRs reported by radiography of the KUB or IVU criteria. Further studies to identify the clinical significance and natural history of residual stone fragments on CT scan after ureteroscopy are needed.

Original languageEnglish (US)
Pages (from-to)379-382
Number of pages4
JournalJournal of Endourology
Volume23
Issue number3
DOIs
StatePublished - Mar 1 2009

Fingerprint

Ureteroscopy
Tomography
Kidney
Urolithiasis
Urography
Ureter
Radiography
Urinary Bladder
Natural History

ASJC Scopus subject areas

  • Urology
  • Medicine(all)

Cite this

MacEjko, Amanda ; Okotie, Onisuru T. ; Zhao, Lee C. ; Liu, Jonathan ; Perry Jr, Kent T ; Nadler, Robert B. / Computed tomography-determined stone-free rates for ureteroscopy of upper-tract stones. In: Journal of Endourology. 2009 ; Vol. 23, No. 3. pp. 379-382.
@article{5955288b235b408f972bf0ba3acbd3eb,
title = "Computed tomography-determined stone-free rates for ureteroscopy of upper-tract stones",
abstract = "Background and Purpose: Most series on ureteroscopy for urolithiasis use postoperative plain radiography of the kidneys, ureters, and bladder (KUB) or intravenous urography (IVU) to determine outcomes. These imaging modalities, however, are not very sensitive and may overestimate stone-free rates (SFRs). The aim of our study was to assess SFRs after ureteroscopy for urolithiasis using CT follow-up. Patients and Methods: A total of 92 patients underwent 113 ureteroscopic procedures for either renal or ureteral stones. Success of ureteroscopy was then determined by the absence of any stone fragments (stone-free). Stone-clearance rates (SCRs) were also calculated for ≤2mm and ≤4mm residual stone fragments. Results: Each renal unit contained a mean of 1.87stones with a mean stone diameter of 8± 6mm. The overall SFR was 50.4{\%}. SFRs were significantly higher for ureteral stones (80{\%}) than renal stones (34.8{\%}) (P= 0.0001). Renal units with multiple stones were less likely to be stone free than those with single stones (P= 0.011). No difference in SFRs was found between lower pole and non-lower-pole stones. Conclusions: Overall SFRs by CT were lower than SFRs reported by radiography of the KUB or IVU criteria. Further studies to identify the clinical significance and natural history of residual stone fragments on CT scan after ureteroscopy are needed.",
author = "Amanda MacEjko and Okotie, {Onisuru T.} and Zhao, {Lee C.} and Jonathan Liu and {Perry Jr}, {Kent T} and Nadler, {Robert B}",
year = "2009",
month = "3",
day = "1",
doi = "10.1089/end.2008.0240",
language = "English (US)",
volume = "23",
pages = "379--382",
journal = "Journal of Endourology",
issn = "0892-7790",
publisher = "Mary Ann Liebert Inc.",
number = "3",

}

Computed tomography-determined stone-free rates for ureteroscopy of upper-tract stones. / MacEjko, Amanda; Okotie, Onisuru T.; Zhao, Lee C.; Liu, Jonathan; Perry Jr, Kent T; Nadler, Robert B.

In: Journal of Endourology, Vol. 23, No. 3, 01.03.2009, p. 379-382.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Computed tomography-determined stone-free rates for ureteroscopy of upper-tract stones

AU - MacEjko, Amanda

AU - Okotie, Onisuru T.

AU - Zhao, Lee C.

AU - Liu, Jonathan

AU - Perry Jr, Kent T

AU - Nadler, Robert B

PY - 2009/3/1

Y1 - 2009/3/1

N2 - Background and Purpose: Most series on ureteroscopy for urolithiasis use postoperative plain radiography of the kidneys, ureters, and bladder (KUB) or intravenous urography (IVU) to determine outcomes. These imaging modalities, however, are not very sensitive and may overestimate stone-free rates (SFRs). The aim of our study was to assess SFRs after ureteroscopy for urolithiasis using CT follow-up. Patients and Methods: A total of 92 patients underwent 113 ureteroscopic procedures for either renal or ureteral stones. Success of ureteroscopy was then determined by the absence of any stone fragments (stone-free). Stone-clearance rates (SCRs) were also calculated for ≤2mm and ≤4mm residual stone fragments. Results: Each renal unit contained a mean of 1.87stones with a mean stone diameter of 8± 6mm. The overall SFR was 50.4%. SFRs were significantly higher for ureteral stones (80%) than renal stones (34.8%) (P= 0.0001). Renal units with multiple stones were less likely to be stone free than those with single stones (P= 0.011). No difference in SFRs was found between lower pole and non-lower-pole stones. Conclusions: Overall SFRs by CT were lower than SFRs reported by radiography of the KUB or IVU criteria. Further studies to identify the clinical significance and natural history of residual stone fragments on CT scan after ureteroscopy are needed.

AB - Background and Purpose: Most series on ureteroscopy for urolithiasis use postoperative plain radiography of the kidneys, ureters, and bladder (KUB) or intravenous urography (IVU) to determine outcomes. These imaging modalities, however, are not very sensitive and may overestimate stone-free rates (SFRs). The aim of our study was to assess SFRs after ureteroscopy for urolithiasis using CT follow-up. Patients and Methods: A total of 92 patients underwent 113 ureteroscopic procedures for either renal or ureteral stones. Success of ureteroscopy was then determined by the absence of any stone fragments (stone-free). Stone-clearance rates (SCRs) were also calculated for ≤2mm and ≤4mm residual stone fragments. Results: Each renal unit contained a mean of 1.87stones with a mean stone diameter of 8± 6mm. The overall SFR was 50.4%. SFRs were significantly higher for ureteral stones (80%) than renal stones (34.8%) (P= 0.0001). Renal units with multiple stones were less likely to be stone free than those with single stones (P= 0.011). No difference in SFRs was found between lower pole and non-lower-pole stones. Conclusions: Overall SFRs by CT were lower than SFRs reported by radiography of the KUB or IVU criteria. Further studies to identify the clinical significance and natural history of residual stone fragments on CT scan after ureteroscopy are needed.

UR - http://www.scopus.com/inward/record.url?scp=65549132871&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=65549132871&partnerID=8YFLogxK

U2 - 10.1089/end.2008.0240

DO - 10.1089/end.2008.0240

M3 - Article

C2 - 19250025

AN - SCOPUS:65549132871

VL - 23

SP - 379

EP - 382

JO - Journal of Endourology

JF - Journal of Endourology

SN - 0892-7790

IS - 3

ER -