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Table 2 Airway outcomes with sLMA insertion and univariate associations with labor status

From: The effects of labor on airway outcomes with Supreme™ laryngeal mask in women undergoing cesarean delivery under general anesthesia: a cohort study

Continuous variables

Labor Status

Univariate analysis

Labor

N = 221

No Labor

N = 363

Mean difference

(95% CI)

p-value

Time to effective ventilation (s), mean (SD)

16.0 (5.75)

15.3 (3.35)

-0.65 (−1.49 to 0.18)

0.1262

Seal pressure (cmH2O), mean (SD)

26.8 (3.44)

27.5 (3.87)

0.79 (0.19 to 1.4)

0.0104

Peak airway pressure (cmH2O), mean (SD)

17.3 (3.76)

18.9 (4.03)

1.54 (0.89 to 2.19)

< 0.0001

Minimum tidal volume (ml), mean (SD)

465.0 (45.62)

484.2 (57.12)

19.17 (10.75 to 27.6)

< 0.0001

Maximum tidal volume (ml), mean (SD)

477.9 (42.61)

501.1 (52.63)

23.21 (15.39 to 31.03)

< 0.0001

Lowest SpO2 (%), mean (SD)

98.6 (1.10)

98.5 (1.14)

−0.10 (−0.29 to 0.09)

0.3012

Gastric aspirate volume (mL), mean (SD)

12.0 (7.16)

15.5 (17.12)

3.53 (1.53 to 5.54)

0.0006

pH of gastric aspirate, mean (SD)

2.3 (0.62)

2.4 (0.95)

0.11 (−0.02 to 0.24)

0.0851

pH of sLMA laryngeal surface, mean (SD)

7.0 (0.55)

7.1 (0.39)

0.08 (0.00 to 0.16)

0.0559

Binary variables

Labor

N = 221

No Labor

N = 363

Unadjusted odds ratio

(95%CI)

p-value

First-attempt sLMA insertion failure, n (%)

9 (4.07)

1 (0.28)

15.37 (1.93 to 122.14)

0.0098

Blood on sLMA, n (%)

7 (3.17)

1 (0.28)

11.84 (1.45 to 96.82)

0.0212

Sore throat, n (%)

14 (6.33)

24 (6.61)

0.96 (0.48 to 1.89)

0.8959

Voice hoarseness, n (%)

2 (0.90)

2 (0.55)

1.65 (0.23 to 11.79)

0.6185