1. Accuracy and precision of the ultrasound cardiac output monitor (USCOM 1A) in pregnancy: comparison with three-dimensional transthoracic echocardiography 
H. McNamara, P. Barclay, V. Sharma 
British Journal of Anaesthesia 
Volume 113, Issue 4, Pages (October 2014)
DOI: /bja/aeu162
Copyright © 2014 The Author(s) Terms and Conditions

2. Fig 1
The same USCOM Doppler trace (velocity vs time) is shown in the (a) FT mode and (b) TP mode. Stroke volume (SV)=π×(OTD/2)2×VTI where OTD is the outflow tract diameter, estimated from nomograms within the USCOM according to height and VTI the velocity–time integral (area under the trace). The red line indicates the area used to calculate the VTI.
British Journal of Anaesthesia  , DOI: ( /bja/aeu162)
Copyright © 2014 The Author(s) Terms and Conditions

3. Fig 2
Bland–Altman plots showing the agreement between 3D-TTE and USCOM (FT, left; TP, right), for measurement of CO (a and b), SV (c and d), and HR (e and f).
British Journal of Anaesthesia  , DOI: ( /bja/aeu162)
Copyright © 2014 The Author(s) Terms and Conditions

4. Fig 3
Bland–Altman plot showing the agreement between LVOT CSA as estimated by USCOM and measured by TTE.
British Journal of Anaesthesia  , DOI: ( /bja/aeu162)
Copyright © 2014 The Author(s) Terms and Conditions

5. Fig 4
Intra-observer reproducibility of the USCOM using the (a) FT and (b) TP modes.
British Journal of Anaesthesia  , DOI: ( /bja/aeu162)
Copyright © 2014 The Author(s) Terms and Conditions