Matthay et al evaluated patients receiving ultramassive blood transfusions and identified factors associated with outcomes. The authors created 2 classification and regression tree (CART) models, one composed of all patients, even those with incomplete data. The authors are from multiple institutions in the United States.
Ultramassive blood transfusion: > 20 units of RBCs in first 24 hours, all patients, including those with incomplete data
Outcome: survival
Parameters:
(1) Glasgow Coma Score (GCS)
(2) age in years
(3) resuscitative thoracotomy
(4) platelet count in 10^9/L
GCS
Age
Thoracotomy
Platelet Count
Survival
3
NA
NA
NA
18%
>= 4
>= 50
NA
NA
25%
>= 4
< 50
yes
NA
26%
>= 4
< 50
no
>= 52 * 10^9/L
71%
>= 5
< 50
no
< 52 * 10^9/L
14%
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