Association between operative position and postoperative nausea and vomiting in patients undergoing laparoscopic sleeve gastrectomy

Table 1 Demographical characteristics data of the patients

Variable	The supine position group	The supine split-leg position group	P value
Age (year)	32.27 ± 7.00	30.40 ± 6.04	0.273
BMI (kg/m2)	39.88 ± 5.48	39.90 ± 4.83	0.986
Gender (female), n (%)	24 (80)	28 (93)	0.490
Smoking	12	2	0.002a
Systolic pressure (mmHg)	141.1 ± 16.90	131.77 ± 17.11	0.038a
Diastolic pressure (mmHg)	93.77 ± 13.18	88.93 ± 12.20	0.146
Blood uric acid (μmol/L)	402.00 (376.00, 485.25)	409.50 (343.25, 464.00)	0.124
Fasting blood-glucose (mmol/L)	5.44 (4.80, 6.96)	5.04 (4.59, 5.62)	0.311
ALT (U/L)	42.50 (18.25, 82.25)	27.00 (17.00, 44.75)	0.149
AST (U/L)	27.00 (18.50, 47.50)	21.00 (17.00, 30.25)	0.120

^aP < 0.05.

Normal distribution was expressed as the mean ± SD, non-normal distribution is expressed as median (interquartile spacing). The percentage (95% confidence interval) was for categorical variables. BMI: Body mass index; ALT: Alanine aminotransferase; AST: Aspartate aminotransferase.

Table 2 Clinical data of the patients

Variable	The supine position group	The supine split-leg position group	P value
Preparation time before surgery (minute)	35.00 (28.75, 50.00)	35.00 (28.75, 50.00)	0.834
Operation time (minute)	140.60 ± 32.26	168.23 ± 46.24	0.009a
Anesthesia recovery time (minute)	42.5 (39.00, 55.00)	50.00 (40.00, 70.00)	0.05
Hospitalization time (day)	4 (1)	4 (0)	0.181

^aP < 0.05.

Normal distribution was expressed as the mean ± SD, non-normal distribution is expressed as median (interquartile spacing). The percentage (95% confidence interval) was for categorical variables.

Table 3 Application of vomiting and antiemetics

Variable	The supine position group	The supine split-leg position group	P value
Vomiting	11 (36.7%)	15 (50.0%)	0.297
Number of antiemetics applications (frequency)
0	19	15	0.599
1-2	9	11
> 3	2	4
Time of application of vomiting medicine
-	19	15	0.736
0-6 hours	5	6
6-12 hours	2	2
> 12 hours	4	7

Table 4 Odds ratio and 95% confidence intervals of risk factors for postoperative nausea and vomiting after bariatric surgery

Influencing factor	P value	OR	95% confidence interval
			Superior limit	Lower limit
Position	0.766	1.192	0.376	3.778
Gender	0.585	0.603	0.098	3.712
BMI	0.515	1.038	0.927	1.163
Smoking	0.161	2.97	0.649	13.592

BMI: Body mass index; OR: Odds ratio.