Table 2.
Changes in impedance during and after closed endotracheal tube suction compared to the baseline (zero) values
| Infant no. | Maximum impedance loss during suction | Residual impedance loss after suction | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Global ΔZ | Region of interest (% of maximum global loss) | Global ΔZ (% of max loss) | Region of interest (% of residual global loss) | |||||||
| V | D | R | L | V | D | R | L | |||
| 1 | −51 | −31 (59) | −20 (41) | −24 (48) | −26 (52) | −5.1 (10) | −4.5 (88) | −0.6 (12) | −3.7 (72) | −1.5 (28) |
| 2 | −68 | −39 (57) | −29 (43) | −33 (48) | −35 (52) | −2.3 (3) | −2.3a | 0.07a | −1.2 (51) | −1.1 (49) |
| 3 | −43 | −15 (35) | −28 (65) | −24 (55) | −19 (45) | 6.2b | 3.7 (60) | 2.5 (40) | 2.1 (34) | 4.1 (66) |
| 4 | −62 | −31 (50) | −31 (50) | −35 (57) | −27 (43) | −1.8 (3) | 1.9a | −3.7a | −1.4 (76) | −0.4 (24) |
| 5 | −58 | −41 (70) | −17 (30) | −27 (46) | −31 (54) | 0.02 (0) | 0.5a | −0.4a | −1.3a | 1.3a |
| 6 | −67 | −31 (46) | −36 (54) | −46 (69) | −21 (31) | −0.1 (0.2) | −0.3a | 0.2a | −1.2a | 1.1a |
| 7 | −34 | −17 (50) | −17 (50) | −19 (57) | −15 (43) | −3.7 (11) | −0.3 (7) | −3.4 (92) | −2.4 (65) | −1.3 (35) |
| 8 | −40 | −22 (55) | −18 (45) | −21 (52) | −19 (48) | −3.5 (9) | −2.8 (81) | −0.7 (19) | −0.8 (23) | −2.7 (77) |
| 9 | −59 | −35 (60) | −24 (40) | −31 (52) | −28 (48) | −8.7 (15) | −3.4 (39) | −5.3 (61) | −4.1 (47) | −4.6 (53) |
| 10 | −49 | −25 (51) | −24 (49) | −24 (49) | −25 (51) | −6.6 (13) | −4.2 (63) | −2.4 (37) | −4.0 (61) | −2.6 (39) |
| 11 | −48 | −32 (66) | −16 (34) | −27 (56) | −21 (44) | 9.3b | 2.3 (25) | 7.0 (75) | 3.5 (37) | 5.8 (63) |
| Median | −51 | −31 (55) | −24 (45) | −27 (52) | −25 (48) | −2.3 (3) | −0.3 | −0.6 | −1.3 | −1.1 |
V Ventral, D dorsal, R right, L left
aRegions with volume loss and increase after endotracheal suction (percentages not shown because of the opposite regional values)
bImpedance stabilized at higher level after suction compared to baseline