Lenoir et al developed the Predictive Model of Transfusion in Spine Surgery (PMTSS) to identify a patient undergoing spinal surgery who may need to be transfused. The authors are from Beaujon University Hospital in Clichy, France.
Parameters:
(1) age of the patient in years
(2) preoperative hemoglobin
(3) number of spinal levels being fused
(4) transpedicular osteotomy
Parameter
Finding
Points
age of the patient in years
<= 50 years of age
0
> 50 years of age
1
preoperative hemoglobin
> 14 g/dL
0
12 to 14 g/dL
1
< 12 g/dL
2
number of spinal levels fused
<= 2
0
> 2 levels
1
transpedicular osteotomy
not performed
0
performed
4
total score =
= MIN(4, SUM(points for all 4 parameters))
Interpretation:
• minimum score: 0
• maximum score: 4
• The risk of needing a transfusion increased as the score increased.
Score
Percent Transfused
0
0%
1
7%
2
19%
3
54%
4
90%
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