Dogan et al reported a nomogram for predicting success of shock-wave lithotripsy in a pediatric patient. This can help to identify a patient who may require more aggressive management. The authors are from Hacettepe University in Ankara, Turkey.
Patient selection: pediatric patient with renal stone, from 5 to 200 months (17 years)
Parameters:
(1) gender
(2) age in months
(3) stone size in mm
(4) stone number
(5) stone location
(6) previous intervention
Parameter
Finding
Points
gender
male
0
female
41
age in months
<= 18 months
0
19 to 36 months
40
37 to 72 months
57
>= 73 months
90
stone size
< 10 mm
0
>= 10 mm
63
stone number
1
0
>= 2
100
stone location
lower pole
52
other
0
previous intervention
no
0
yes
25
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 371
value of X =
= (0.0122 * (score)) - 1.839
probability of failure with first session =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.69.
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