Table 2.

Comparisons of related parameter between ZEEP and high PEEP in 30 patients

Variables	ZEEP	High PEEP	P value
SpO2 (%)	95 (91–98)	98 (96–99)	0.008*
HR (bpm)	94 ± 17	94 ± 17	0.783
MAP (mmHg)	87 ± 9	84 ± 10	0.022*
EELI (AU)	1400 (996–1800)	7883 ± 3739	< 0.0001*
GI	0.411 (0.370–0.503)	0.386 (0.350–0.432)	0.131
VQMatch%	61 (47–70)	71 ± 10	< 0.0001*
DeadSpace%	18 ± 10	13 ± 10	0.013*
Shunt%	22 ± 14	16 ± + 11	0.008*
R pixels total	Baseline	142 ± 74	N/A
Ventral	Baseline	32 (13–95)¶	N/A
Dorsal	Baseline	82 (53–128)	N/A
O pixels total	Baseline	48 (0–121)	N/A
Ventral	Baseline	48 (0–115)¶	N/A
Dorsal	Baseline	0 (0–0.25)	N/A
O/R pixels ratio	Baseline	0.45 (0–1.1)	N/A

SpO₂ peripheral capillary oxygen saturation, HR heart rate, MAP mean arterial pressure, EELI end-expiratory lung impedance, GI the global inhomogeneity index, R recruitment, O overdistension, N/A not applicable

*Significantly different between ZEEP vs. high PEEP

^¶P < 0.05 compared to dorsal