Korean J Urol.  2012 Dec;53(12):848-852. 10.4111/kju.2012.53.12.848.

Influence of Ureteral Stone Components on the Outcomes of Electrohydraulic Lithotripsy

• Song HC
• Jung HB
• Lee YS
• Lee YG
• Kim KK
• Cho ST

• KMID: 1988730
• DOI: http://doi.org/10.4111/kju.2012.53.12.848

Abstract

PURPOSE
We evaluated the influence of urinary stone components on the outcomes of ureteroscopic removal of stones (URS) by electrohydraulic lithotripsy (EHL) in patients with distal ureteral stones.
MATERIALS AND METHODS
Patients with a single distal ureteral stone with a stone size of 0.5 to 2.0 cm that was completely removed by use of EHL were included in the study. Operating time was defined as the time interval between ureteroscope insertion and complete removal of ureteral stones. Ureteral stones were classified into 5 categories on the basis of their main component (that accounting for 50% or more of the stone content) as follows: calcium oxalate monohydrate (COM), calcium oxalate dihydrate, carbonate apatite (CAP), uric acid (UA), and struvite (ST).
RESULTS
A total of 193 patients (131 males and 62 females) underwent EHL. The mean operating time was 25.1+/-8.2 minutes and the mean stone size was 1.15+/-0.44 cm. Calcium oxalate stones accounted for 64.8% of all ureteral stones, followed by UA (19.7%), CAP (8.3%), and ST (7.2%) stones. The mean operating time was significantly longer in the UA group (28.6+/-8.3 minutes) than in the COM group (24.0+/-7.8 minutes, p=0.04). In multivariate analyses, the stone size was negatively associated with the odds ratio (OR) for successful fragmentation. UA as a main component (OR, 0.42; 95% confidence interval, 0.20 to 0.89; p=0.023) was also found to be significantly important as a negative predictive factor of successful fragmentation after adjustment for stone size.
CONCLUSIONS
The results of the present study suggest that successful fragmentation by URS with EHL could be associated with the proportion of the UA component.

Keyword

Lithotripsy; Ureteroscopy; Uric acid; Urinary

MeSH Terms

Accounting
Apatites
Calcium Oxalate
Carbon
Humans
Lithotripsy
Magnesium Compounds
Male
Multivariate Analysis
Odds Ratio
Phosphates
Ureter
Ureteroscopes
Ureteroscopy
Uric Acid
Urinary Calculi
Apatites
Calcium Oxalate
Carbon
Magnesium Compounds
Phosphates
Uric Acid

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