Fig. 3From: The assessment of circulating volume using inferior vena cava collapse index and carotid Doppler velocity time integral in healthy volunteers: a pilot studyCorrelations between IVCCI with the change in stroke volume on passive leg raise. (a) Correlation between IVCCI with quiet respiration and increase in stroke volume on passive leg raise. (b) Correlation between IVCCI with a sniff and increase in stroke volume on passive leg raiseBack to article page