Cheng et al reported a nomogram for predicting the risk of surgical site infection following resection of a lung neoplasm. This can help to identify a patient who may require closer monitoring. The authors are from Shanghai Jiao Tong University
Patient selection: status post resection of a lung neoplasm by minimally invasive surgery
Parameters:
(1) sex
(2) best FEV1 to FVC ratio
(3) medication for diabetes
(4) age in years
(5) operation time in minutes
points for best FEV1 to FVC ratio =
= 100 - (0.328 * (ratio))
Parameters
Findings
Points
sex
female
0
male
33.6
diabetes medications
no
0
yes
40
age in years
<= 60 years
0
> 60 years
27.4
operation time
< 60 minutes
0
60 to 120 minutes
24
120 to 180 minutes
50.5
> 180 minutes
100
total score =
= SUM(points for all of the parameters)
Interpretation:
• minimum score: 0
• maximum score: 289.5
value of X =
= (0.02706 * (score)) - 4.295
probability of SSI =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve was 0.81.
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