O'Donnell et al developed a simple score for predicting the risk of blood transfusion in a patient undergoing endovascular repair of an infrarenal abdominal aortic aneurysm. The authors are from Beth Israel Deaconess Medical Center in Boston.
Patient selection: infrarenal abdominal aortic aneurysm, S/P endovascular repair
Outcome: blood transfusion
Parameters:
(1) hematocrit in percent
(2) diameter of the aneurysm in centimeters
(3) COPD
(4) functional status
Parameter
Finding
Points
hematocrit
> 36 percent
0
30 to 36 percent
3
< 30 percent
5
diameter
< 5.5 cm
>= 5.5 cm
1
COPD
no
yes
functional status
independent
not independent
2
total score =
= SUM(points for all 4 parameters)
Interpretation:
• minimum score: 0
• maximum score: 9
• The higher the score the greater the risk of blood transfusion.
Total Score
Risk of Transfusion
2%
3%
4.6%
7%
4
10.5%
15.3%
6
22%
7
30.4%
8
40.4%
9
51.3%
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Specialty: Clinical Laboratory, Surgery, general, Cardiology
