Fig. 3
From: Emergency department non-invasive cardiac output study (EDNICO): an accuracy study
Accuracy of each method was assessed by its agreement with LVOT VTI (left ventricular outflow tract velocity time integral) in identifying fluid responders. Changes in stroke volume (ΔSV) after fluid challenge as determined by LVOT VTI are plotted against CCABF (common carotid artery blood flow) (a), SSAD (suprasternal aortic Doppler) (b), bioreactance (c), and PVUT (plethysmography vascular unloading technique) (d). A 10% exclusion zone is marked by a square in the concordance plots. Dots in the right upper quadrant (red area) indicate agreement between LVOT VTI and the test method in identifying fluid responders. IVCCI was assessed with a dot plot (e) which shows the IVCCI values of fluid responders (FR) on the left and fluid non-responders (NR) on the right. The receiver operating characteristic curve (f) had an area under the receiver operating curve (AUROC) of 0.464 (p = 0.747) [95% CI 0.264–0.675]