Xiao et al reported a nomogram for predicting perioperative blood transfusion for a patient undergoing intracranial aneurysm clamping surgery. The authors are from Hubei University of Arts and Sciences in China.
Patient selection: intracranial aneurysm clamping surgery
Parameters:
(1) white blood cell count in 10^9/L
(2) sex
(3) ruptured aneurysm
(4) plasma D-dimer in mg/L
(5) platelet count in 10^9/L
(6) hemoglobin in g/L
points for WBC =
= (1.877 * (WBC count)) + 25.26
points for D-dimer =
= (1.744 * (D-dimer)) + 41.853
points for platelet count =
= 101.484 - (0.262 * (platelet count))
points for hemoglobin =
= 173.523 - (0.969 * (hemoglobin))
|
Parameter
|
Finding
|
Points
|
|
sex
|
male
|
39.94
|
|
|
female
|
50.74
|
|
ruptured aneurysm
|
no
|
38.52
|
|
|
yes
|
51.61
|
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 167.967
• maximum score: 451.493
value of X =
= (0.0514 * (score)) - 15.83
probability of transfusion =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.83 in the derivation and 0.80 in the validation cohorts.
