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Fig. 3 | BMC Anesthesiology

Fig. 3

From: The value of arterial pressure waveform cardiac output measurements in the radial and femoral artery in major cardiac surgery patients

Fig. 3

Polar Plot. Polar plots: Polar plot analysis describes the vector of CO change as an angle to the line of identity (x = y). In case this angle is zero or 180°, the agreement of the two CO readings is 100%. The magnitude of change in CO is represented as the average of the reference (PiCCO) and the test (ProAQT®) cardiac output (distance from the center). The exclusion zone is 0.5 L/min. Two statistical variables are shown from the polar data: (1) the angular bias, which is the average angle between all polar data points and the horizontal polar axis. (2) The polar concordance rate, which is the proportion of data points that lie within 30° of the polar axis (thick lines)

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BMC Anesthesiology

ISSN: 1471-2253

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