Table 2.
Anesthetic outcomes of participants receiving either SLMA or ETT while undergoing cesarean section under general anesthesia
| Characteristics | SLMA (n = 460) |
ETT (n = 460) |
Mean Difference / Odds ratio (95%CI) |
p-value |
|---|---|---|---|---|
| Number of insertion attempts, n (%) | ||||
| First attempt | 456 (99.1) | 456 (99.1) | Reference | – |
| Second attempt or more | 4 (0.9) | 4 (0.9) | 1.00 (0.25, 4.02) | 1.0000 |
| Time to effective ventilation (s), mean (SD) | 16.1 (3.9) | 39.1 (7.2) | -22.96 (−23.71, −22.21) | < 0.0001 |
| Seal pressure (cmH2O), mean (SD) | 27.1 (3.8) | 27.9 (3.6) | -0.77 (−1.25, −0.30) | 0.0014 |
| Lowest tidal volume (ml), mean (SD) | 430.9 (39.2) | 429.2 (39.3) | 1.76 (−3.32, 6.84) | 0.4965 |
| Lowest respiratory rate (breaths /min), median (IQR) | 12 (12.0, 12.0) | 12 (12.0, 12.0) | 0.00 (0.00, 0.00) | 0.7957 |
| Highest peak airway pressure (cmH2O), mean (SD) | 16.8 (3.4) | 17.0 (3.6) | −0.14 (−0.59, 0.31) | 0.5320 |
| Seal pressure minus highest peak airway pressure (cmH2O), mean (SD) | 10.3 (4.2) | 10.9 (4.3) | −0.63 (−1.18, − 0.08) | 0.0250 |
| Lowest SpO2 (%), median (IQR) | 99.0 (97.0, 99.0) | 98.5 (97.0, 99.0) | 0.50 (0.00, 0.00) | 0.2109 |
| Baseline systolic blood pressure (mmHg), mean (SD) | 116.8 (8.6) | 116.8 (11.2) | −0.002 (−1.297, 1.292) | 0.9974 |
| Systolic blood pressure 2 min after induction (mmHg), mean (SD) | 114.0 (11.1) | 133.9 (18.2) | −19.96 (−21.91, − 18.01) | < 0.0001 |
| Systolic blood pressure 5 min after induction (mmHg), mean (SD) | 103.7 (10.4) | 111.2 (13.3) | −7.51 (−9.06, −5.97) | < 0.0001 |
| Baseline heart rate (beats /min), mean (SD) | 84.4 (10.3) | 85.5 (10.1) | −1.04 (−2.36, 0.28) | 0.1210 |
| Heart rate 2 min after induction (beats /min), mean (SD) | 93.6 (12.9) | 105.4 (11.7) | −11.75 (− 13.34, − 10.16) | < 0.0001 |
| Heart rate 5 min after induction (beats /min), mean (SD) | 88.0 (13.3) | 92.9 (11.9) | −4.87 (−6.5, −3.24) | < 0.0001 |
Difference between the two categories are expressed as mean difference or median difference and odds ratio with 95% confidence interval for continuous and categorical values, respectively. Categorical values are compared using Chi-Square test and continuous variables are compared using two-sample Student’s t-test or Wilcoxon test. P-values of 0.05 or less are considered significant