Patient selection: abdominoplasty
Outcome: medical complications or unplanned reoperation within 30 days (medical complications include: pneumonia, unexpected reintubation, ventilator dependence for > 48 hours, pulmonary embolism, deep vein thrombosis, renal insufficiency, UTI, peripheral nerve injury, myocardial infarction, bleeding requiring transfusion and sepsis)
Parameters:
(1) age in years
(2) body mass index (BMI) in kg per square meter
(3) gender
(4) diabetes mellitus
(5) smoker within the past year
(6) pulmonary comorbidity
(7) hypertension requiring medication
(8) bleeding disorder
(9) ASA class
(10) duration of operation in hours
|
Parameter
|
Finding
|
beta coefficient for medical complication
|
beta coefficient for unplanned reoperation
|
|
age
|
|
(0.002*(age))
|
(0.029*(age))
|
|
BMI
|
|
(0.088*(BMI))
|
(0.078*(BMI))
|
|
gender
|
male
|
0.194
|
0.601
|
|
|
female
|
0
|
0
|
|
diabetes
|
no
|
0
|
0
|
|
|
yes
|
0.691
|
0.440
|
|
smoker
|
no
|
0
|
0
|
|
|
yes
|
0.642
|
1.064
|
|
pulmonary comorbidity
|
no
|
0
|
0
|
|
|
yes
|
0.190
|
-0.265
|
|
hypertension
|
no
|
0
|
0
|
|
|
yes
|
0.234
|
0.277
|
|
bleeding disorder
|
no
|
0
|
0
|
|
|
yes
|
1.520
|
0
|
|
ASA class
|
1 or 2
|
0
|
0
|
|
|
>= 3
|
-0.032
|
0.673
|
|
duration of surgery
|
<= 6 hours
|
0
|
0
|
|
|
> 6 hours
|
0.255
|
0
|
X for medical complications =
= SUM(points for all 10 parameters) - 6.313
probability of medical complication =
= 1/(1+EXP((-1)*X))
Y for unplanned reoperation =
= SUM(points for all 10 parameters) - 8.263
probability of unplanned reoperation =
= 1/(1+EXP((-1)*Y))
