Gu et al reported a nomogram for predicting urosepsis in a diabetic patient following percutaneously nephrolithotomy. The authors are from Peking University in China.
Patient selection: diabetic patient status post percutaneous nephrolithotomy
Parameters:
(1) preoperative urine culture
(2) preoperative urine nitrite
(3) intraoperative hypotension
(4) staghorn calculus
Parameter
Finding
Points
preoperative urine culture
negative
0
positive
36.3
preoperative urine nitrite
negative
0
positive
55.6
intraoperative hypotension
no
0
yes
100
staghorn calculus
no
0
yes
47.2
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 239
value of X =
= (0.02203 * (score)) - 3.025
probability of urosepsis =
= 1 / (1 + EXP((-10 * X))
Performance:
• The area under the ROC curve is 0.83.
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