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Table 4 Repeatability of measurements comparing scan-rescan and interval scans

From: Test-retest variability of left ventricular 4D flow cardiovascular magnetic resonance measurements in healthy subjects

 

Scan-rescan

Interval scans

 
 

Observed mean difference (95% confidence interval)

CoV

Observed mean difference (95% confidence interval)

CoV

P value between CoV for scan-rescan and interval scans

End diastolic volume, ml

6.6 (−11.9 to 25.1)

4.6

1.1 (−19.2 to 21.4)

4.6

0.65

End systolic volume, ml

1.4 (−7.3 to 10.2)

6.8

−1.0 (− 13.3 to 11.3)

9.5

0.11

Left ventricular ejection fraction, %

0.4 (−5.5 to 6.5)

3.0

1.1 (−5.2 to 7.3)

3.3

0.12

Heart rate, bpm

4.3 (−6.9 to 15.5)

7.6

1.7 (−11.7 to 15.1)

6.8

0.18

Volume ratios

 

Direct flow, % EDV

−0.2 (−2.8 to 2.3)

2.5

−1.0 (−7.1 to 5.1)

6.2

0.10

Retained inflow, % EDV

−0.5 (−4.1 to 3.0)

6.6

0.7 (−6.0 to 7.5)

16.1

0.04

Delayed ejection flow, % EDV

0.6 (−3.9 to 5.0)

9.2

−0.6 (−7.2 to 6.0)

15.0

0.07

Residual volume, % EDV

0.2 (−2.0 to 2.4)

3.0

0.9 (−5.4 to 7.2)

8.0

0.007

Kinetic energy

 

Direct flow KE at ED, μJ/ml

0.4 (−2.8 to 3.7)

13.5

−0.01 (−4.2 to 4.2)

16.9

0.40

Retained inflow KE at ED, μJ/ml

0.5 (−1.6 to 2.6)

13.8

0.03 (−3.5 to 3.5)

20.4

0.13

Delayed ejection flow KE at ED, μJ/ml

0.7 (−1.5 to 3.0)

17.7

0.6 (−2.5 to 3.8)

27.5

0.16

Residual volume KE at ED, μJ/ml

0.06 (−0.5 to 0.6)

15.4

0.1 (−0.8 to 0.9)

29.0

0.23

  1. CoV Coefficient of variation, EDV End diastolic volume, bpm Beats per minute