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Table 3 Agreement and concordance analyses between esophageal Doppler and pulse pressure-derived algorithms for estimation of cardiac output and tracking EDCO changes

From: Impact of arterial load on the agreement between pulse pressure analysis and esophageal Doppler

PPCO algorithm

Mean CO, L/minute

Bias ± LOA, L/minute

PE, percentage

Four-quadrant plot

Polar plot

    

Concordance, percentage

Concordance, percentage

Mean θ ± RLOA, degrees

Windkessel

6.40

−0.11 ± 2.50

40.2

76.8

63.8

12.5 ± 52.7

Fluid administration

6.30

−0.01 ± 1.67

27.0

93.4

74.9

6.5 ± 47.5

Vasopressor change

6.59

−0.29 ± 3.15

49.8

51.8

44.7

22.9 ± 55.1

Windkessel with RC decay

6.41

−0.12 ± 2.42

38.9

77.2

64.9

12.0 ± 52.5

Fluid administration

6.31

−0.02 ± 1.68

27.2

93.6

76.8

6.5 ± 46.7

Vasopressor change

6.60

−0.31 ± 2.99

47.3

51.0

43.4

21.9 ± 57.5

Liljestrand-Zander

6.16

0.13 ± 1.66

27.2

92.3

70.5

−5.6 ± 48.8

Fluid administration

6.07

0.22 ± 1.55

25.5

91.4

64.0

−3.9 ± 53.4

Vasopressor change

6.32

−0.03 ± 1.70

27.5

94.1

84.4

−9.2 ± 35.9

Herd

6.45

−0.16 ± 2.47

39.6

76.1

59.5

13.1 ± 55.4

Fluid administration

6.35

−0.06 ± 1.89

30.6

91.7

64.5

9.9 ± 49.1

Vasopressor change

6.63

−0.34 ± 2.91

46.0

48.2

39.2

19.4 ± 64.4

Pressure root-mean-square

6.42

−0.13 ± 2.54

40.8

75.6

63.9

13.6 ± 52.6

Fluid administration

6.31

−0.02 ± 1.69

27.4

92.1

77.7

7.2 ± 44.8

Vasopressor change

6.63

−0.34 ± 3.21

50.7

45.7

40.1

24.5 ± 57.9

Systolic area

6.37

−0.08 ± 2.29

36.9

66.6

59.9

6.1 ± 62.7

Fluid administration

6.19

0.10 ± 1.49

24.4

88.5

75.1

−3.9 ± 50.7

Vasopressor change

6.69

−0.39 ± 2.88

45.3

36.6

35.3

22.2 ± 67.1

Systolic area with correction

6.34

−0.05 ± 2.27

36.7

66.3

61.5

4.9 ± 62.5

Fluid administration

6.17

0.12 ± 1.55

25.3

86.1

74.7

−3.7 ± 51.2

Vasopressor change

6.66

−0.37 ± 2.78

43.8

38.4

35.8

19.2 ± 69.1

Corrected impedance

6.27

0.02 ± 2.10

34.1

65.4

60.2

−1.8 ± 60.3

Fluid administration

6.10

0.19 ± 1.50

24.7

80.3

70.4

−8.5 ± 50.9

Vasopressor change

6.60

−0.31 ± 2.48

39.2

44.9

41.9

10.2 ± 68.3

  1. Concordance refers to the percentage of agreement between changes between esophageal Doppler cardiac output (EDCO) and pulse-pressure derived cardiac output (PPCO) measurements (exclusion zone = 9.5%, obtained from the combined least significant change for EDCO and PPCO). CO, cardiac output; LOA, limits of agreement; mean θ, mean angle of all radial vectors from the polar axis; PE, percentage of error = 2 standard deviations/mean of pulse pressure-derived and esophageal Doppler cardiac output measurements; RLOA, radial limits of agreement.
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Critical Care

ISSN: 1364-8535