TABLE 2.
Early (23–29 wk)
|
Late (36–39 wk)
|
|||
---|---|---|---|---|
Control (n = 10) | Ventilated (n = 7) | Control (n = 7) | Ventilated (n = 6) | |
V(lu), ml | 23.40 ± 9.07 | 39.98 ± 8.27* | 70.84 ± 22.44 | 104.89 ± 33.74† |
AA(pa/lu), % | 91.22 ± 1.91 | 88.97 ± 1.22 | 88.77 ± 1.77 | 88.33 ± 6.12 |
V(pa), ml | 21.42 ± 8.53 | 35.51 ± 7.04* | 62.78 ± 20.17 | 92.50 ± 27.98† |
AA(ae/pa), % | 71.13 ± 8.68 | 65.18 ± 6.80 | 53.18 ± 9.58 | 75.45 ± 11.42* |
V(ae), ml | 14.88 ± 5.25 | 23.13 ± 4.94* | 33.29 ± 12.81 | 68.48 ± 25.83* |
AA(end/ae), % | 19.52 ± 5.10 | 17.43 ± 4.34 | 21.57 ± 5.86 | 18.92 ± 4.37 |
V(end), ml | 2.91 ± 1.36 | 3.93 ± 0.98 | 7.50 ± 3.34 | 12.16 ± 3.97† |
Definition of abbreviations: AA(ae/pa) = areal density of air-exchanging parenchyma; AA(end/ae) = areal density of PECAM-1–immunoreactive microvascular endothelial compartment; AA(pa/lu) = parenchymal areal density; V(ae) = total volume of air-exchanging parenchyma; V(end) = total microvascular endothelial volume; V(lu) = total lung volume; V(pa) = parenchymal volume.
Values represent means ± SD of (n) lungs.
p < 0.01 versus corresponding control.
p < 0.05 versus corresponding control.