Li et al reported a nomogram for predicting lower extremity deep vein thrombosis in a neurocritical care patient. The authors are from Tongi University in Shanghai.
Patient: neurocritical ICU
Parameters:
(1) age in years from 10 to 100
(2) Glasgow coma scale (GCS)
(3) infection
(4) muscle strength grade, from 0 to 5 (using the MRC scale)
(5) D-dimer level in µg/mL, from 0 to 80
points for age =
= (1.11 * (age)) - 11.11
points for GCS =
= 42.5 - (2.83 * (GCS))
points for D-dimer =
= 0.992 * (DDimer)
Parameter
Finding
Points
infection
no
0
yes
14.1
muscle strength grade
<= 3
22.1
>= 4
0
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 249.6
value of X =
= (0.04428 * (score)) - 4.868
probability of deep vein thrombosis =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.82 in the derivation and 0.78 in validation cohorts.
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