Individualized risk estimation for postoperative pulmonary complications after hepatectomy based on perioperative variables

Table 1 Post-surgical pulmonary complications

Complication-pulmonary	n	Ratio (n/total number of patients), %
Pleural cavity infection	1	0.06
Respiratory tract infection	3	0.18
Pneumothorax	3	0.18
Respiratory insufficiency	7	0.43
Atelectasis	22	1.35
Pneumonia	30	1.84
Pleural effussion	184	11.27

Table 2 Univariate analysis of preoperative clinical risk factors related to pulmonary complications of hepatectomy

Variable	n	Pearson coefficient	P value1
Age (years old)		0.087	0.000
≥ 65	147
< 65	1486
Medical diseases requiring drug treatment		0.200	< 0.001
Yes	248
No	1385
Child-pugh grade		0.093	< 0.001
A	1463
B, C	170
Number of segments resected		0.124	< 0.001
≤ 2 segments resected	1046
≥ 3 segments resected	587
Blood transfusion		0.182	0.000
Yes	689
No	944
Blood loss (mL)		0.103	< 0.001
≥ 800	204
< 800	1429
Operation duration (min)		0.169	0.000
≥ 180	922
< 180	711
Adjacent organ invasion		0.066	0.007
Yes	18
No	1615
Preoperative hospital stay (days)		0.098	0.000
≤ 7	1142
> 7	491

¹Pearson’s correlation analysis.

Table 3 Multivariate analysis to screen and assign independent influencing factors of post-hepatectomy pulmonary complications

Variable	Odds ratio	P value1
χ1: Age (≥ 65 years old/< 65 years old)	1.926	0.011
χ2: Medical diseases requiring drug treatment (Yes/No)	3.523	< 0.001
χ3: Number of segments resected (≥ 3/≤ 2)	1.683	0.002
χ4: Operation duration (≥ 180 min/< 180 min)	1.896	0.004
χ5: Blood transfusion (Yes/No)	1.836	0.003

¹Logistic regression.

Table 4 New scoring system

Variable	Conditions	Scores
χ1: Age	< 65 years old	0
	≥ 65 years old	2
χ2: Medical diseases requiring drug treatment	No	0
	Yes	4
χ3: Number of segments resected	≤ 2	0
	≥ 3	2
χ4: Operation duration	< 180 min	0
	≥ 180 min	2
χ5: Blood transfusion	No	0
	Yes	2

Note: The total score was calculated as the sum of the five variables.