Effects of ultrasound-guided alveolar recruitment manoeuvres compared with sustained inflation or no recruitment manoeuvres on atelectasis in laparoscopic gynaecological surgery as assessed by ultrasonography: a randomized clinical trial

Table 4 Number of recruitment manoeuvres

	T1		χ2 P value		T2		χ2 P value
	SI group	UD group	χ2 P value		SI group	UD group	χ2 P value
Number of RMs
0	0(0.00%)	0(0.00%)	45.88	0.00	0(0.00%)	0(0.00%)	49.09	0.00
1	30(100.00%)	4(13.33%)			30(100.00%)	3(10.00%)
2	0(0.00%)	14(46.67%)			0(0.00%)	13(43.33%)
3	0(0.00%)	8(26.67%)			0(0.00%)	7(23.3%3)
4	0(0.00%)	4(13.33%)			0(0.00%)	6(20.00%)
5	0(0.00%)	0(0.00%)			0(0.00%)	1(3.33%)
Maximal inflation pressure(cmH₂O)
30	30(100.00%)	18(90.00%)	3.13	0.08	30(100.00%)	13(65.00)	12.21	0.00
35	0(0.00%)	2(10.00%)			0(0.00%)	5(25.00%)
40	0(0.00%)	0(0.00%)			0(0.00%)	2(10.00%)

ISSN: 1471-2253