Wang et al reported a nomogram to predict peripartum blood transfusion for a patient undergoing Cesarean section. The authors are from Cheeloo College of Shandong University in China.
Patient selection: woman undergoing Cesarean section
Parameters:
(1) age in years, from 15 to 50
(2) predelivery hemoglobin in g/L. from 70 to 150
(3) predelivery plasma fibrinogen in g/L, from 7.0 to 1.5
(4) preeclampsia
(5) placental abnormalities
points for age =
= (2.0686 * (age)) - 31.0286
points for hemoglobin =
= 100.125 - (0.6675 * (hemoglobin))
points for fibrinogen =
= 127.2727 - (18.1818 * (fibrinogen))
|
Parameter
|
Finding
|
Points
|
|
preeclampsia
|
no
|
0
|
|
|
yes
|
47.7
|
|
placental abnormalities
|
no
|
0
|
|
|
yes
|
42.1
|
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 315.6
X =
= (0.04032 * (score)) - 5.921
probability of perioperative blood transfusion =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.82.
