Zhang et al reported a model for predicting loss of renal function after a partial nephrectomy. The authors are from Fudon University and Xuhai Central Hospital Shanghai in China.
Patient selection: status post partial nephrectomy
Parameters:
(1) age of the patient in years, from 20 to 85
(2) body mass index in kg per square meter, from 14 to 36
(3) diabetes mellitus
(4) operative time in minutes
(5) diameter-axial-polar (DAP) diameter level
(6) acute kidney injury
points for age =
= (1.42 * (age)) - 28.49
points for BMI =
= (4.545 * (BMI)) - 63.63
Parameter
Finding
Points
diabetes mellitus
no
0
yes
25
operative time
<= 110 minutes
0
> 110 minutes
28
DAP diameter level
1 (< 2.4 cm)
0
2 (2.5 to 4.4 cm)
35.9
3 (> 4.4 cm)
38.7
acute kidney injury
no
0
yes
44.1
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 328.38
value of X =
= (0.03676 * (score)) - 8.124
probability of renal function loss =
= 1 / (1 +EXP((-1) * X))
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