Jing et al reported a nomogram for predicting acute kidney injury (AKI) after cardiac surgery with cardiopulmonary bypass. This can help to identify a patient who may benefit from more aggressive management of renal function. The authors are from Southern Medical University in Guangzhou City and the First People's Hospital of Foshan in China.
Patient selection: status post cardiac surgery with cardiopulmonary bypass
Parameters:
(1) sex
(2) age in years, from 0 to 100
(3) hypertension
(4) minutes on cardiopulmonary bypass, from 0 to 900
(5) intraoperative transfusion of red blood cells in units, from 0 to 50
(6) intraoperative transfusion volume of 5% sodium bicarbonate solution in mL, from 0 to 1,000
(7) intraoperative urine output in mL, from 0 to 5,500 mL
points for age =
= 0.888 * (years)
points for cardiopulmonary bypass time =
= 0.080667 * (minutes)
points for RBC units =
= 2 * (number of units)
points for sodium bicarbonate solution =
= 0.0674 * (volume)
points for urine output =
= 41.3 - (0.0075091 * (volume))
|
Parameter
|
Finding
|
Points
|
|
sex
|
male
|
22.66
|
|
|
female
|
0
|
|
hypertension
|
no
|
0
|
|
|
yes
|
22.89
|
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 415.71
value of X =
= (0.03089 * (score)) - 4.843
probability of AKI =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.75.
