Comparison of superior and inferior vena cava diameter variation measured with transthoracic echocardiography to predict fluid responsiveness in mechanically ventilated patients after abdominal surgery

Table 2 Main hemodynamic and ultrasonographic parameters between responders and non-responders at baseline and after volume expansion

Parameters	Time Point	Resonder (n = 30)	Nonresponder (n = 40)	P
MAP (mmHg)	T0	91 ± 13	90 ± 11	0.829
MAP (mmHg)	T1	94 ± 15	92 ± 11	0.506
CVP (cmH₂O)	T0	6 ± 2	6 ± 2	0.848
CVP (cmH₂O)	T1	7 ± 2†	7 ± 3†	0.774
HR (beats min⁻¹)	T0	62 ± 11	60 ± 9	0.346
HR (beats min⁻¹)	T1	64 ± 10†	59 ± 8†	0.013
VTI (cm)	T0	20.8 ± 3.4	22.3 ± 3.3	0.054
VTI (cm)	T1	24.3 ± 3.4†	23.3 ± 3.7†	0.286
CO (L min⁻¹)	T0	3.9 (3.5–4.6)	4.3 ± 1.0	0.455
CO (L min⁻¹)	T1	4.7 (4.2–5.6) †	4.4 ± 1.0†	0.02
SVCCI	T0	0.33 ± 0.11	0.16 (0.12–0.21)	< 0.001
SVCCI	T1	0.29 ± 0.09	0.17 ± 0.08	< 0.001
dIVC	T0	0.20 (0.16–0.35)	0.13 (0.08–0.21)	0.001
dIVC	T1	0.22 (0.14–0.33)	0.12 (0.07–0.19)	0.002
SVCV	T0	0.18 (0.13–0.29)	0.11 (0.07–0.15)	< 0.001
SVCV	T1	0.20 (0.14–0.28)	0.13 ± 0.08	< 0.001

^†P < 0.05 versus before fluid challenge test. T0, Before fluid challenge; T1, After fluid challenge; P-value corresponds to the comparison between Responders and Nonresponders

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