Table 5.
Intra- and inter-observer reproducibility for left atrial strain and strain rate measurements derived by fast and FT approach
| Method | Strain/SR | Intra-observer (n = 20) | Inter-observer (n = 20) | ||
|---|---|---|---|---|---|
| Bias (limits of agreement) | CV, % | Bias (limits of agreement) | CV, % | ||
| Fast approach | εs, % | −0.01 (−2.37, 2.34) | 3.6 | −0.15 (−3.16, 2.86) | 4.7 |
| εe, % | −0.15 (−1.81, 1.51) | 5.3 | 0.10 (−1.58, 1.77) | 5.3 | |
| εa, % | 0.14 (−1.76, 2.04) | 6.2 | −0.25 (−2.93, 2.43) | 8.9 | |
| SRs, 1/s | 0.03 (−0.18, 0.23) | 6.5 | 0.06 (−0.24, 0.35) | 9.7 | |
| SRe, 1/s | −0.05 (− 0.29, 0.18) | 7.9 | − 0.03 (− 0.29, 0.23) | 8.1 | |
| SRa, 1/s | −0.01 (− 0.25, 0.24) | 6.4 | −0.03 (− 0.38, 0.32) | 9.4 | |
| FT approach | εs, % | 0.16 (−5.39, 5.72) | 8.6 | 0.21 (−5.29, 5.71) | 8.5 |
| εe, % | 0.24 (−2.54, 3.02) | 8.8 | −0.17 (−3.18, 2.84) | 9.5 | |
| εa, % | −0.08 (− 3.01, 2.87) | 9.6 | 0.38 (− 3.26, 4.02) | 11.9 | |
| SRs, 1/s | 0.03 (−0.28, 0.34) | 9.5 | 0.07 (−0.25, 0.39) | 10.0 | |
| SRe, 1/s | −0.06 (− 0.36, 0.25) | 10.3 | 0.08 (− 0.26, 0.42) | 11.4 | |
| SRa, 1/s | −0.03 (− 0.44, 0.37) | 10.6 | − 0.08 (− 0.62, 0.45) | 13.9 | |
ε left atrial strain, SR left atrial strain rate, FT feature tracking, CV coefficient of variation