Alonso-Tunon et al reported a model for predicting perioperative blood transfusion for a patient undergoing cardiac surgery. The authors are from Virgen del Rocio University Hospital, University of Seville and Vigen Macarena University Hospital in Seville, Spain.
Patient selection: cardiac surgery
Parameters:
(1) preoperative hemoglobin in g/dL
(2) surgical procedure
(3) body mass index in kg per square meter
(4) sex
(5) age in years
Parameters
Finding
Points
hemoglobin
>= 14 g/dL
0
13 to 13.9 g/dL
0.74
12 to 12.9 g/dL
1.58
11 to 11.9 g/dL
2.38
< 11 g/dL
3.94
surgical procedure
single
0
combined
1.38
body mass index
< 30
0
>= 30
0.38
sex
male
0
female
0.51
age in years
< 60 years
0
>= 60 years
0.31
value of X =
= SUM(points for all of the parameters) - 1.46
probability of perioperative blood transfusion =
= 1 / (1+EXP((-1) * X))
Performance:
• The area under the ROC curve was 0.81.
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