| Haemodynamic response | Group 1 (N = 30) | Group 2 (N = 30) | P-value |
| Heart rate (per min), mean ± SD | 78 ± 6 | 73 ± 6 | > 0.05 |
| SBP (mmHg), mean ± SD | 117 ± 6 | 118 ± 4 | > 0.05 |
| DBP (mmHg), mean ± SD | 79 ± 5 | 78 ± 3 | > 0.05 |
| SpO2 (%), mean ± SD | 99 ± 3 | 99 ± 2 | > 0.05 |
| EtCO2, (mmHg), mean ± SD | 32 ± 1 | 33 ± 1 | > 0.05 |