Intra-and inter-observer variability of point of care ultrasound measurements to evaluate hemodynamic parameters in healthy volunteers

The Ultrasound Journal

Table 3 Inter-researcher variability: ICC based on all three examiners’ full sets of images, with the 95% confidence interval and the correlating sample size number of volunteers

Parameter	ICC	95% Confidence interval		Sample size (N = 21)
Parameter	ICC	Lower border	Upper border	Sample size (N = 21)
Measured
LVOT-D	0.518	0.237	0.763	17
LVOT-VTI	0.427	0.098	0.739	13
EPSS	0.427	0.098	0.739	13
MAPSE	0.409	0.087	0.714	15
TAPSE	0.303	0.028	0.605	18
IVC-D	0.655	0.295	0.876	12
rCBF-D	0.302	− 0.054	0.682	12
rCBF-VTI	0.152	− 0.071	0.511	12
Calculated
CO	0.621	0.309	0.848	13
SV	0.693	0.414	0.881	13
IVC-CI	0.472	0.135	0.777	12
rCBF	0.148	− 0.052	0.489	12

ICC intra-class correlation coefficient, LVOT-D left ventricular outflow tract diameter, LVOT VTI left ventricular outflow tract velocity time integral, EPSS e point septal separation, MAPSE mitral annular plane systolic excursion, TAPSE tricuspid annulus plane systolic excursion, IVC-D inferior vena cava diameter, rCBF-D right Carotid blood flow diameter, rCBF-VTI right Carotid blood flow velocity–time integral, CO cardiac output, SV stroke volume, IVC-CI inferior vena cava collapsibility index, rCBF right Carotid blood flow