Doshi et al reported the Transfusion Requirement Prediction Score (TRPS) for predicting transfusion in a patient undergoing cardiac surgery. The authors are from Kasturba Medical College and Manipal Academy of Higher Education in India2
Patient selection: cardiac surgery
Parameters:
(1) hemoglobin in g/dL
(2) bypass time in minutes
(3) left ventricular ejection fraction in percent
(4) age in years
(5) sex
(6) history of warfarin prophylaxis
Parameter
Finding
Points
hemoglobin
< 12.5 g/dL
0
>= 12.5 g/dL
2
bypass time
< 148 minutes
0
>= 148 minutes
2
ejection fraction
>= 57%
0
< 57%
1
sex
male
0
female
1
age
< 59 years
0
>= 59 years
2
warfarin prophylaxis
no
0
yes
2
where:
• The point assignment for hemoglobin and ejection fraction seems counterintuitive.
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 10
• A score > 5 indicates high risk for blood transfusion.
Performance:
• The area under the ROC curve is 0.71.
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