Wu et al reported the WCRDA score for predicting renal dysfunction following open surgical repair of an abdominal aortic aneurysm. The authors are from West China Medical School of Sichuan University in Chengdu.
WCDRA = West China Renal Dysfunction after AAA open surgical repair
Patient selection: open surgical repair of an abdominal aortic aneurysm
Parameters:
(1) ruptured vs unruptured aneurysm
(2) blood loss in liters
(3 hemodynamic instability
(4) current smoking
(5) serum creatinine prior to surgery in µmol/L
(6) therapy with antihypertensive drugs (BD meds)
Aneurysm Status
Other Parameter
Finding
Points
ruptured
blood loss
<= 1 liter
0
ruptured
blood loss
> 1 liter
1
ruptured
hemodynamic instability
no
0
ruptured
hemodynamic instability
yes
1
ruptured
creatinine
<= 150 µmol/L
0
ruptured
creatinine
> 150 µmol/L
2
unruptured
blood loss
<= 1 liter
0
unruptured
blood loss
> 1 liter
1
unruptured
smoker
no
0
unruptured
smoker
yes
1
unruptured
BP meds
no
0
unruptured
BP meds
yes
2
total score =
= SUM(points for applicable parameters)
Interpretation:
• minimum score: 0
• maximum score: 4
• The higher the score the greater the risk of renal dysfunction.
Score
Unruptured
Ruptured
0
2%
6%
1
6%
20%
2
24%
48%
3
41%
77%
4
78%
92%
Performance:
• The area under the ROC curve is 0.79 for the ruptured cohort.
• The area under the ROC curve is 0.81 for the unruptured cohort.
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