Table 1.
Phase angle α and slopes for perfused lung quadrants in comparison to ROIHeart while filtered around the heart rate.
| Phase angle α (degrees) | Slope of linear regression fit | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ant-R | Ant-L | Post-R | Post-L | Ant-R | Ant-L | Post-R | Post-L | ||
| Breath hold period unfiltered | Mean | 181 | 152 | 180 | 153 | -0.75 | -0.53 | -0.98 | -0.44 |
| CI | 40 | 55 | 41 | 54 | 0.58 | 0.23 | 0.98 | 0.31 | |
| Breath hold period filtered | Mean | 159 | 152 | 159 | 157 | -0.53 | -0.45 | -0.58 | -0.36 |
| CI | 11 | 13 | 11 | 10 | 0.15 | 0.20 | 0.16 | 0.15 | |
| Spontaneous breathing filtered | Mean | 167 | 159 | 172 | 168 | -0.50 | -0.49 | -0.50 | -0.37 |
| CI | 7 | 11 | 8 | 7 | 0.09 | 0.16 | 0.10 | 0.12 | |
All lung quadrants had phase angles close to 180 degrees and negative slopes indicating reversed ΔZ behaviour. Neither filtering of the impedance signal nor respiration impacted on the slopes (P = ns, two-way-ANOVA). Ant L/R, anterior left/right; CI, confidence interval; Post L/R, posterior left/right.