The risk of deep vein thrombosis is increased in patients with carbon monoxide poisoning. Feng and Li developed a model for predicting the risk. The authors are from Cangzhou Central Hospital in China.
Patient selection: carbon monoxide poisoning
Outcome: deep vein thrombosis in lower extremity
Parameters:
(1) plasma D-dimer level, from 0 to 10
(2) duration of coma, from 0 to 24 days
points for D-dimer =
= (plasma D-dimer) * 10
points for coma duration =
= (coma duration) * 2.0583
total score =
= SUM(points for both parameters)
Interpretation:
• minimum score: 0
• maximum score: 149.4
value of X =
= (0.1754 * (total score)) - 5.168
probability of deep vein thrombosis =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve is 0.93.
