Prediction of arterial pressure increase after fluid challenge

BMC Anesthesiology

Table 2 Cardiovascular, urinary and metabolic variables

	All patients			Before fluid challenge
	Before fluid challenge	After fluid challenge	p	Non-responders	Responders	p
Heart rate (beat.min^-1)	81 ± 19	77 ± 17	0.08	78 ± 14	83 ± 21	0.43
Mean arterial pressure (mmHg)	57 (53-59)	67 (63-74)	< 0.001	56 (53-58)	59 (53-60)	0.45
Central venous pressure (mmHg)	8 ± 5	11 ± 6	< 0.001	5 (4-10)	9 (5-11)	0.31
Central venous saturation (%)	72 ± 10	73 ± 10	0.22	73 ± 8	71 ± 11	0.45
Arterial lactate (mMol.l^-1)	1.3 (1-2.1)	1.3 (1-1.7)	0.022	1.5 (0.8-2.5)	1.3 (1-1.9)	1
Δv-aPCO₂ (mmHg)	6 (3.5-7.5)	5(2.8-6.3)	0.58	6 ± 3	5 ± 4	0.42
Urinary output (ml.kg^-1.h^-1)	0.7 (0.4-1.2)	1.1 (0.6-1.6)	0.024	0.7 (0.4-1.2)	0.8 (0.4-1.1)	0.53
FENa (%)	0.3 (0.1-1.2)	0.4 (0.1-1.5)	1	0.3 (0.1-1.3)	0.4 (0.1-1.2)	0.77
Urinary Na/K ratio	0.9 (0.3-2.2)	0.8 (0.3-2.7)	0.48	0.6 (0.2-2.5)	1.1 (0.4-2.1)	0.54

Δv-aPCO₂: central venous to arterial CO₂ partial pressure difference; FENa: fractional excretion of sodium. Data are shown as mean ± SD or median (interquartile range). Δv-aPCO2 and FENa were evaluated in 35 patients, urinary Na/K ratio 31 patients

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