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Table 7 Comparison between group A: VCV and group B: PCV-VG according to lung US finding

From: Comparison between volume-controlled ventilation and pressure-controlled volume-guaranteed ventilation in postoperative lung atelectasis using lung ultrasound following upper abdominal laparotomies: a prospective randomized study

Lung US finding Group A: VCV (n = 30) Group B: PCV-VG (n = 30) x2 p value
Intraoperative 30 min  
Normal 8 (26.7%) 14 (46.7%) 2.540 0.111
Abnormal 22 (73.3%) 16 (53.3%)
Absent A-lines 12 (40%) 10 (33.3%) 0.285 0.593
Presence B-lines 14 (46.7%) 11 (36.7%) 0.607 0.436
Lung pulse 17 (56.7%) 10 (33.3%) 3.263 0.0708
Immediate postoperative
Normal 9 (30.0%) 11 (36.7%) 0.298 0.585
Abnormal 21 (70.0%) 19 (63.3%)
Absent A-lines 11 (36.7%) 9 (30.0%) 0.298 0.585
Presence B-lines 16 (53.3%) 14 (46.7%) 0.257 0.612
Lung pulse 16 (53.3%) 14 (46.7%) 0.257 0.612
After 2 h
Normal 10 (33.3%) 12 (40%) 0.285 0.593
Abnormal 20 (66.7%) 18 (60%)
Absent A-lines 7 (23.3%) 5 (16.7%) 0.402 0.526
Presence B-lines 14 (46.7%) 13 (43.3%) 0.069 0.793
Lung pulse 13 (43.3%) 12 (40%) 0.066 0.797
After 6 h
Normal 11 (36.7%) 14 (46.7%) 0.607 0.436
Abnormal 19 (63.3%) 16 (53.3%)
Absent A-lines 8 (26.7%) 6 (20.0%) 0.360 0.548
Presence B-lines 14 (46.7%) 13 (43.3%) 0.069 0.793
Lung pulse 14 (46.7%) 13 (43.3%) 0.069 0.793
  1. Data presented as number and percentage, p value > 0.05 NS; *p value < 0.05 S
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