Constans et al reported a prediction model for lower limb deep vein thrombosis in an outpatient. This is in distinction to their previous St Andre score for inpatients. The authors are from Hopital Saine-Andre, Societe Regionale de Medecine Vasculaire Aquataine and Universite Victor Segalen-Bordeaux II in France.
Patient selection: outpatient
Parameters:
(1) sex
(2) lower limb palsy or immobilization
(3) confinement to bed in days
(4) lower limb enlargement
(5) unilateral limb pain
(6) another plausible diagnosis that can explain the findings
Parameter
Finding
Points
sex
female
0
male
1
lower limb palsy or immobilization
no
0
yes
1
confinement to bed
no or <= 3 days
0
> 3 days
1
lower limb enlargement
no
0
yes
1
unilateral limb pain
no
0
yes
1
another plausible diagnosis
no
0
yes
-1
total score =
= SUM(points for all 6 parameters)
Interpretation:
• minimum score: -1
• maximum score: 5
• The higher the score the greater the risk of deep vein thrombosis.
Score
Risk Group
Percent with DVT
<= 0
low
4-7%
1 or 2
intermediate
27-30%
>= 3
high
58-82%
Performance:
• The area under the ROC curve is 0.79.
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