The Relationship between the frequency of PP and oxygenation
index
The Improvement of oxygenation in different times of PP showed that PP1
exhibited the highest percentage of oxygenation improvement: PP1
(73.1%,57/78) vs PP2 (71.9%,41/57) vs PP3 (51.5%,17/33)
(Fig 3A).
The more times of PP, the more pronounced of increase in oxygenation
index (Fig 3B).
The magnitude of change in oxygenation index was compared among patients
who underwent PP at least three times (34 patients), (all compared with
the difference in oxygenation index at T0 of the current PP). At the end
of the PP (T3), it was observed that PP1 had the highest change: PP1
[30.8 (-16.4,46.9)] vs PP2
[7.0 (-11.8,38.0)] vs PP3 [1.25 (-28,28)]. Furthermore,
during the duration of the PP (T1, T2), PP2 showed the highest change:
PP1 [34.5 (17.8,83.4)] vs to PP2 [56.3 (13.0,92.8)]vs PP3 [40.0 (7.0,67.0)] (Fig 3C).
The oxygenation indices at each point (T0, T1, T2, T3) of PP1
demonstrated a continuous increase after the initiation PP: T0 [115.0
(98.6,147.5)] vs T1 [167.0 (133.0,215.0)] vs T2
[185.0 (147.5,230.0)]. Furthermore, the oxygenation indices were
higher at the end of PP1: T3 [161.3 (116.5,213.4)] vs T0
[115.0 (98.6,147.5)] (Fig 3D).