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Table 5 Interobserver variability of main exercise Doppler echocardiographic measurements of all participating centers at rest and at peak exercise

From: A multicentric quality-control study of exercise Doppler echocardiography of the right heart and the pulmonary circulation. The RIGHT Heart International NETwork (RIGHT-NET)

  TRV (cm/s) RVOT Act
(msec)
TAPSE
(mm)
RV S′
(cm/s)
RV FAC
(%)
LVOT VTI
(cm)
E
(cm/s)
e’
(cm/s)
LV EF (%)
MOD
Rest
 Mean 282 ± 22 128 ± 28 20.2 ± 2.2 12.2 ± 0.5 58 ± 8 20.5 ± 1.8 59.7 ± 5.3 12.0 ± 1.1 50 ± 4.6
 Mean absolute difference 10.6 ± 10.8 13 ± 14 1.1 ± 1.2 0.4 ± 0.5 9.5 ± 7 1.6 ± 1.7 3.5 ± 4.2 0.7 ± 0.9 3.9 ± 3
 Mean relative difference, % 3.8 ± 4 9.7 ± 9 5.3 ± 5.5 2.9 ± 3.9 15 ± 10 7.4 ± 7 5.7 ± 6.6 6.0 ± 6.9 7.6 ± 5.8
 ICC 0.97 0.95 0.97 0.95 0.82 0.98 0.99 0.97 0.97
 95% Confidence interval 0.92–0.99 0.93–0.99 0.92–0.99 0.88–0.98 0.75–0.91 0.95–0.99 0.97–0.99 0.93–0.99 0.93–0.99
Peak exercise
 Mean 322 ± 16 92 ± 16 24.2 ± 4.3 20.9 ± 1 59 ± 11 22.0 ± 2.8 82 ± 6.4 21 ± 1,6 57 ± 7
 Mean absolute difference 7.7 ± 7.4 11 ± 11 1.5 ± 3 0.6 ± 0.8 9.2 ± 7.7 2.2 ± 2.4 7.3 ± 6.4 1.4 ± 1.2 5 ± 4
 Mean relative difference, % 2.4 ± 2.3 12 ± 13 8 ± 14 2.9 ± 3.4 16 ± 14 9.6 ± 10 8.3 ± 7.0 6.5 ± 5.1 9 ± 7
 ICC 0.98 0.92 0.95 0.95 0.80 0.97 0.98 0.97 0.96
 95% Confidence interval 0.95–0.99 0.89–0.99 0.90–0.99 0.80–0.98 0.74–0.90 0.92–0.99 0.95–0.99 0.93–0.99 0.92–0.99
  1. Legend: Act acceleration time; CH chamber; E, mitral early inflow velocity; e’ early diastolic mitral annular lateral velocity; EF ejection fraction; FAC fractional area change; ICC intraclass correlation coefficient; LVOT left ventricular outflow tract; MOD biplane method of disks (modified Simpson’s rule); RV right ventricle; RVOT right ventricular outflow tract; S′, tissue Doppler–derived tricuspid lateral annular systolic velocity; TAPSE tricuspid annular plane systolic excursion; TRV tricuspid regurgitation velocity; VTI velocity time integral
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