Cao et al reported a model with accompanying nomogram for evaluating a patient undergoing laparoscopic cholecystectomy. These can help to identify a patient who may have a prolonged stay in the postanesthesia care unit (PACU). The authors are from Sun Yat-sen Memorial Hospital.
Patient selection: laparoscopic cholecystectomy
Parameters:
(1) sex
(2) age in years
(3) body mass index (BMI) in kg per square meter
(4) ASA grade, from 1 to 4
(5) active smoker
(6) gastrointestinal disease
(7) liver disease
(8) cardiovascular disease
Parameter
Finding
Points
sex
male
0
female
0.058
age in years
< 65 years
0
>= 65 years
0.757
BMI
< 28
0
>= 28
-0.395
ASA grade
0.318* (ASA)
active smoker
no
0
yes
0.739
gastrointestinal disease
no
0
yes
1.142
liver disease
no
0
yes
-0.719
cardiovascular disease
no
0
yes
0.637
value of X =
= SUM(points for all of the parameters) - 2.241
probability of prolonged stay in PACU =
= 1 / (1 + EXP((-1) * X))
Performance:
• The area under the ROC curve was 0.66 for the training set and 0.61 for the validation set.
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