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Table 2 Pearson linear correlations between Doppler indices and levels of LBNP

From: Comparison of tricuspid inflow and superior vena caval Doppler velocities in acute simulated hypovolemia: new non-invasive indices for evaluating right ventricular preload

    

Relationship to LBNP

Index

Max

Min

Ave

Slope

Intercept

Pearson

P

S(cm/s)

80.2

17.9

38.9 ± 15.0

-1.001

69.0

-0.744

<0.001

D(cm/s)

52.7

12.7

28.6 ± 8.3

-1.626

76.4

-0.674

<0.001

AR(cm/s)

28.6

4.2

14.7 ± 6.1

-2.534

67.3

-0.771

<0.001

E(cm/s)

80.0

39.0

63.2 ± 10.2

-0.977

91.7

-0.495

<0.001

A(cm/s)

59.0

29.5

42.3 ± 6.9

0.546

6.88

0.188

0.087

S/D

1.96

0.93

1.34 ± 0.21

-47.21

93.4

-0.501

<0.001

E/A

2.66

0.90

1.53 ± 0.36

-26.58

70.7

-0.473

<0.001

HR

112

52

76 ± 12

1.089

-53.0

0.668

<0.001

  1. LBNP=lower body negative pressure; S= systolic forward velocity of SVC; D= diastolic forward velocity of SVC; AR= atrial reversal velocity of SVC; E=early transtricuspid filling velocity; A=late transtricuspid filling velocity; HR=heart rate; Max=maximum; Min=minimum; Ave=average.