Table 1. Results of EIT and arterial blood gas measurements (mean ± SD) in 6 horses for the first 6 hours (t1-t6) after recovery from anaesthesia.
ROI = Region of interest 1–4; tfillr = Filling time for each region (1dors, 2dors, 3dors, 4mid, 5vent, 6vent, 7vent); tinflr = Inflation period for each region (1dors-7vent); RR = Respiratory rate; VTEIT = Tidal volume as calculated from the EIT signal; PaCO2 = Arterial partial pressure of carbon dioxide; PaO2 = Arterial partial pressure of oxygen. Values are percentages unless otherwise stated.
| Baseline | t1 | t2 | t3 | t4 | t5 | t6 | p Value | |
|---|---|---|---|---|---|---|---|---|
| hold % | 45.7 ± 9.0 | 67.5 ± 8.6 | 62.1 ± 10.8 | 55.5 ± 6.2 | 56.0 ± 8.0 | 53.1 ± 8.3 | 52.0 ± 8.4 | <0.001 |
| ROI 1 | 13.0 ± 3.8 | 10.2 ± 6.2 | 13.2 ± 3.0 | 12.0 ± 4.9 | 12.5 ± 5.3 | 11.5 ± 4.3 | 10.4 ± 3.8 | 0.202 |
| ROI 2 | 36.6 ± 3.5 | 35.3 ± 5.7 | 36.2 ± 4.5 | 36.0 ± 5.9 | 36.4 ± 3.9 | 36.6 ± 2.4 | 34.1 ± 1.7 | 0.353 |
| ROI 3 | 38.9 ± 3.4 | 41.9 ± 4.8 | 40.1 ± 2.5 | 41.1 ± 6.0 | 40.0 ± 4.6 | 40.6 ± 3.4 | 41.7 ± 3.2 | 0.176 |
| ROI 4 | 11.5 ± 2.6 | 12.6 ± 6.8 | 10.5 ± 4.9 | 10.8 ± 6.5 | 11.2 ± 4.7 | 11.3 ± 2.4 | 13.7 ± 2.8 | 0.250 |
| tfillr 1dors | 49.5 ± 9.2 | 48.5 ± 22.7 | 56.1 ± 15.1 | 49.5 ± 13.3 | 45.2 ± 16.6 | 47.6 ± 15.3 | 48.5 ± 8.3 | 0.511 |
| tfillr 2dors | 51.3 ± 4.9 | 52.3 ± 10.1 | 53.5 ± 8.6 | 51.6 ± 10.3 | 48.6 ± 11.5 | 50.6 ± 9.4 | 51.6 ± 7.7 | 0.735 |
| tfillr 3dors | 52.2 ± 3.8 | 47.4 ± 5.5 | 50.3 ± 3.4 | 48.1 ± 13.4 | 48.5 ± 8.5 | 49.8 ± 6.6 | 52.3 ± 8.3 | 0.190 |
| tfillr 4mid | 52.8 ± 3.9 | 43.9 ± 7.1 | 48.2 ± 4.7 | 47.6 ± 12.1 | 48.6 ± 7.5 | 49.5 ± 5.9 | 50.4 ± 6.3 | 0.003 |
| tfillr 5vent | 53.5 ± 4.1 | 41.7 ± 8.0 | 47.0 ± 6.4 | 46.3 ± 12.0 | 48.7 ± 8.9 | 49.5 ± 5.6 | 49.6 ± 6.1 | <0.001 |
| tfillr 6vent | 53.9 ± 4.8 | 40.8 ± 11.1 | 45.0 ± 7.0 | 46.7 ± 6.6 | 47.6 ± 9.7 | 49.0 ± 6.5 | 49.1 ± 6.0 | <0.001 |
| tfillr 7vent | 53.3 ± 7.6 | 37.9 ± 12.9 | 37.1 ± 22.6 | 36.4 ± 23.5 | 39.7 ± 20.8 | 47.3 ± 9.0 | 47.7 ± 11.5 | 0.002 |
| tinflr 1dors | 54.7 ± 10.4 | 57.8 ± 18.4 | 63.2 ± 13.3 | 52.8 ± 13.1 | 58.2 ± 13.3 | 49.5 ± 15.7 | 54.7 ± 12.1 | 0.086 |
| tinflr 2dors | 51.6 ± 7.2 | 66.5 ± 6.5 | 62.5 ± 10.6 | 54.4 ± 9.8 | 58.7 ± 10.8 | 52.8 ± 8.5 | 56.6 ± 7.4 | <0.001 |
| tinflr 3dors | 48.7 ± 7.8 | 66.3 ± 8.3 | 61.0 ± 9.7 | 53.8 ± 11.5 | 58.3 ± 10.9 | 52.8 ± 7.9 | 54.8 ± 7.0 | <0.001 |
| tinflr 4mid | 46.6 ± 7.9 | 65.3 ± 9.5 | 59.3 ± 9.5 | 53.0 ± 13.0 | 55.7 ± 9.7 | 52.7 ± 8.7 | 53.0 ± 7.4 | <0.001 |
| tinflr 5vent | 44.1 ± 7.6 | 57.9 ± 11.2 | 54.1 ± 10.0 | 51.3 ± 10.6 | 51.6 ± 10.7 | 50.5 ± 9.6 | 48.9 ± 9.4 | <0.001 |
| tinflr 6vent | 41.2 ± 8.3 | 45.1 ± 16.8 | 44.2 ± 18.9 | 47.6 ± 11.2 | 48.3 ± 12.5 | 48.7 ± 11.4 | 43.8 ± 9.6 | 0.366 |
| tinflr 7vent | 37.1 ± 9.4 | 34.3 ± 15.0 | 37.7 ± 28.6 | 36.9 ± 19.0 | 35.1 ± 17.3 | 43.6 ± 12.4 | 39.7 ± 8.7 | 0.503 |
| RR (breaths per minute) | 7.6 ± 0.8 | 6.0 ± 2.9 | 7.1 ± 2.0 | 9.2 ± 2.2 | 8.8 ± 3.6 | 8.9 ± 2.3 | 10.1 ± 4.3 | 0.247 |
| VTEIT (mL) | 6079.7 ± 2733.3 | 5120.3 ± 1631.7 | 5355.8 ± 1987.6 | 5258.2 ± 1856.6 | 5058.3 ± 2413.0 | 5086.1 ± 1617.1 | 5308.5 ± 1989.9 | 0.982 |
| PaCO2 kPa (mmHg) | 5.6 ± 0.4 (42.0 ± 3.2) | 6.2 ± 1.2 (46.7 ± 8.7) | 6.6 ± 0.5 (49.5 ± 3.4) | 5.9 ± 0.8 (43.9 ± 5.7) | 5.7 ± 0.3 (42.4 ± 2.0) | 5.2 ± 0.3 (39.0 ± 2.0) | 5.3 ± 0.3 (39.4 ± 2.5) | 0.004 |
| PaO2 kPa (mmHg) | 12.0 ± 1.2 (90.0 ± 9.2) | 11.1 ± 1.6 (83.2 ± 12.0) | 10.9 ± 1.5 (82.0 ± 11.0) | 11.1 ± 1.9 (83.2 ± 14.1) | 10.3 ± 1.5 (77.5 ± 11.5) | 11.2 1.3 (84.2 ± 9.9) | 11.0 ± 1.2 (82.2 ± 9.2) | 0.840 |