Effects of fluid administration on renal perfusion in critically ill patients

Table 6 Changes in resistivity index in responders and non-responders to fluid challenge, defined using a cut-off of a 10 % increase in MAP, PP or both

Fluid responsiveness	Increase in MAP >10 %		Increase in PP >10 %		Increase in MAP or PP >10 %
Fluid responsiveness	Responsive	Non-responsive	Responsive	Non-responsive	Responsive	Non-responsive
	n = 20	n = 29	n = 27	n = 22	n = 30	n = 19
RI	0.75 (0.70–0.81)	0.75 (0.67–0.80)	0.74 (0.67–0.81)	0.75 (0.68–0.80)	0.75 (0.67–0.81)	0.75 (0.69–0.78)
RI₂	0.73 (0.67–0.79)	0.73 (0.65–0.78)	0.72 (0.66–0.78)	0.74 (0.66–0.78)	0.73 (0.66–0.79)	0.74 (0.66–0.78)
p	<0.01	0.018	<0.01	0.40	<0.01	0.69

Variables are shown as median and interquartile range and were compared using Wilcoxon test. MAP mean arterial pressure, n number of patients, PP, pulse pressure, RI resistivity index at baseline, RI₂ resistivity index after fluid challenge

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