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Figure 2 | Critical Care

Figure 2

From: Equipment review: New techniques for cardiac output measurement – oesophageal Doppler, Fick principle using carbon dioxide, and pulse contour analysis

Figure 2

Principle of stroke volume calculation from aortic velocity (VAo) measurements. The area under the maximum aortic velocity envelope (VTI) represents the stroke distance. Assuming that all red blood cells are moving at maximum velocity and that aortic cross-sectional area is constant during systole, stroke volume is obtained by multiplying stroke distance by aortic cross-sectional area.

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Critical Care

ISSN: 1364-8535