Two-minute disconnection technique with a double-lumen tube to speed the collapse of the non-ventilated lung for one-lung ventilation in thoracoscopic surgery

Table 4 MAP, HR, SpO₂ and rSO₂ at different time points

Variable	Group	T₀	T₁	T₂	T₃	T₄
MAP	N (n = 20)	76 ± 11.1	73 ± 11.3	72 ± 6.1	74 ± 10.3	71 ± 7.8
(mmHg)	C (n = 20)	74 ± 9.2	72 ± 7.8	73 ± 7.7	72 ± 9.3	72 ± 7.0
HR	N (n = 20)	71 ± 11.1	63 ± 6.6*	68 ± 7.5	69 ± 6.1	70 ± 8.0
(bpm)	C (n = 20)	73 ± 11.4	65 ± 7.8*	67 ± 6.9	70 ± 6.9	69 ± 7.3
SpO₂	N (n = 20)	96 ± 0.7	99 ± 0.8*	99 ± 2.3*	99 ± 1.2*	99 ± 1.0*
(%)	C (n = 20)	95 ± 0.9	99 ± 0.9*	99 ± 1.3*	99 ± 1.1*	99 ± 0.9*
Left rSO₂	N (n = 20)	69 ± 4.7	75 ± 4.1*	78 ± 3.4*†	70 ± 7.7	71 ± 4.1
(%)	C (n = 20)	70 ± 4.5	75 ± 5.5*	74 ± 5.9*	71 ± 6.9	70 ± 4.4
Right rSO₂	N (n = 20)	68 ± 4.3	74 ± 5.1*	77 ± 4.3*†	71 ± 4.9	70 ± 4.1
(%)	C (n = 20)	69 ± 4.8	75 ± 5.0*	74 ± 5.2*	72 ± 4.9*	71 ± 3.6

The data are expressed as the mean ± SD values. * P < 0.05 compared with T₀. ^† P < 0.05 compared with group C

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