World Journal of Nephrology and Urology, ISSN 1927-1239 print, 1927-1247 online, Open Access
Article copyright, the authors; Journal compilation copyright, World J Nephrol Urol and Elmer Press Inc
Journal website http://www.wjnu.org

Original Article

Volume 2, Number 2, November 2013, pages 60-64

The Influence of Stone Size, Skin to Stone Distance and Hydronephrosis on Extracorporeal Shock Wave Lithotripsy Session and Shock Wave Numbers in Ureteral Stones

Figure

Figure 1.
Figure 1. Shockwave/sessions number and stone size according to of hydronephrotic grades, P < 0.05; *compared to grade 1, **compared to grade 2.

Tables

Table 1. Variables in Hydronephrotic Grades (Mean ± SD)
 
Grade 1 (N = 35)Grade 2 (N = 28)Grade 3 (N = 17)
P < 0.05, *compared to grade 1, **compared to grade 2 (Mann-Whitney U).
Age (years)35.7 ± 8.538.5 ± 14.240.6 ± 14.2
Gender (m/f)24/1121/711/6
Stone size (mm)8.7 ± 2.69.6 ± 3.111.7 ± 3.7*, **
SWL shocks’ number2,821 ± 1,6943,835 ± 1,949*5,666 ± 2,381*, **
SWL sessions’ number1.3 ± 0.51.7 ± 0.8*2.3 ± 1.1*
Skin-stone distance (cm)9.5 ± 1.99.6 ± 2.39.9 ± 1.5

 

Table 2. Variables According to Stone Size (Mean ± SD)
 
Group I ≤ 10 mm (N = 57)Group II > 10mm (N = 23)
*P < 0.05, compared to group I (independent samples test).
Gender (m/f)43/1413/10
Age (years)38.8 ± 12.635.2 ± 10.0
Stone size (mm)7.9 ± 1.413.9 ± 2.4
Shockwave number3,318 ± 1,9335,036 ± 2,346*
SWL session number1.4 ± 0.62.3 ± 1.1*
Skin-stone distance (cm)9.4 ± 1.810.2 ± 2.3

 

Table 3. The Correlation of Variables With SWL Parameters
 
Pearson correlation
rP
*P > 0.05, **P < 0.001.
Stone Diameter-Shock number0.5130.000**
Stone Diameter-Session number0.6090.000**
Hydronephrotic grade-Shock number0.4720.000**
Hydronephrotic grade-Session number0.4410.000**
Skin-stone distance-Shockwave number0.1470.194*
Skin-stone distance-Session number0.2060.067*