Viarasilpa et al reported the ICU-Venous Thromboembolism Score for predicting the risk of symptomatic venous thromboemboli (VTE) in a critically-ill patient. The authors are from Henry Ford Hospital, Siriraj Hospital of Mahidol University and Wayne State University.
Patient selection: ICU
Parameters:
(1) prior history of venous thromboemboli
(2) platelet count on hospital admission per microliter
(3) central venous catheter
(4) duration of in-hospital mobilization in days
(5) invasive mechanical ventilation
(6) lowest hemoglobin during hospital stay in g/dL
Parameter
Finding
Points
prior history of VTE
no
0
yes
4
platelet count on admission
<= 250,000 per µL
0
> 250,000 per µL
1
central venous catheter
no
0
yes
5
immobilization
< 4 days
0
>= 4 days
4
mechanical ventilation
no
0
yes
2
lowest hemoglobin
< 9 g/dL
0
>= 9 g/dL
2
total score =
= SUM(points for all 6 parameters)
Interpretation:
• minimum score: 0
• maximum score: 18
• The higher the score the greater the risk of venous thromboembolism.
Score
Risk Group
Observed VTE
0 to 8
low
0.3%
9 to 14
intermediate
3.6%
15 to 18
17.7%
Performance:
• The area under the ROC curve is 0.87.
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