TABLE 5.
Intra‐observer variability for the echocardiographic measurements in 30 patients
| Measure | Mean | Range | Absolute | Relative (%) a | ICC | ||||
|---|---|---|---|---|---|---|---|---|---|
| Difference ±SD | 95% LOA | p | Difference ±SD | 95% LOA | p | ||||
| LVEDD (mm) | 46.7 | 38 ‐ 61 | ‐0.3 ± 2.7 | ‐5.6 / 5.0 | 0.55 | ‐1 ± 6 | ‐12/ 11 | 0.47 | 0.88 |
| LVESD (mm) | 31.0 | 22 ‐ 52 | ‐0.6 ± 1.9 | ‐4.3 / 3.1 | 0.08 | ‐2 ± 7 | ‐16 / 11 | 0.09 | 0.95 |
| Septal thickness (mm) | 7.0 | 5 ‐ 10 | 0.3 ± 1.0 | ‐1.7 / 2.3 | 0.12 | 4 ± 13 | ‐23 / 32 | 0.10 | 0.74 |
| Posterior wall thickness (mm) | 8.7 | 7 ‐ 13 | 0.2 ± 1.8 | ‐3.4 / 3.7 | 0.62 | 2 ± 22 | ‐42 / 45 | 0.71 | 0.56 |
| Left atrial volume (ml) | 36.9 | 17 ‐ 84 | ‐0.8 ± 6.3 | ‐13.1 / 11.3 | 0.49 | ‐1 ± 18 | ‐36 / 33 | 0.71 | 0.90 |
| E wave (cm/s) | 81.5 | 43 ‐ 149 | 0.0 ± 3.0 | ‐5.8 / 5.8 | 1 | ‐1 ± 5 | ‐10 / 9 | 0.47 | 0.99 |
| A wave (cm/s) | 56.5 | 36 ‐ 147 | 0.4 ± 2.7 | ‐4.9 / 5.7 | 0.42 | 1 ± 5 | ‐10 / 11 | 0.43 | 0.99 |
| TDI LV e’ lateral (cm/s) | 14.8 | 6 ‐ 25 | 0.1 ± 0.7 | ‐1.3 / 1.5 | 0.45 | 1 ± 5 | ‐9 / 10 | 0.62 | 0.99 |
| TAPSE (mm) | 21.5 | 12 ‐ 29 | ‐0.3 ± 1.6 | ‐3.4 / 2.8 | 0.27 | ‐2 ± 7 | ‐17 / 12 | 0.11 | 0.93 |
| Fractional shortening (%) | 34.1 | 16 ‐ 49 | 0.8 ± 5.3 | ‐9.6 / 11.3 | 0.40 | ‐2 ± 18 | ‐33 / 37 | 0.57 | 0.79 |
| LV ejection fraction (%) b | 55.6 | 39 ‐ 65 | 0.3 ± 3.6 | ‐6.7 / 7.3 | 0.67 | 1 ± 7 | ‐12 / 13 | 0.65 | 0.87 |
| Global longitudinal strain (%) | ‐19.1 | ‐14 ‐ −24 | 0.5 ± 1.2 | ‐2.0 / 2.9 | 0.06 | ‐2 ± 6 | ‐15 / 10 | 0.05 | 0.82 |
| LV mechanical dispersion (msec) | 41.3 | 21 ‐ 59 | 0.2 ± 5.6 | ‐10.7 / 11.1 | 0.83 | ‐0.2 ± 14 | ‐28 / 27 | 0.93 | 0.86 |
| Global circumferential strain (%) | ‐20.2 | ‐15 ‐ −25 | ‐0.1 ± 1.5 | ‐3.1 / 2.9 | 0.60 | 1 ± 8 | ‐15 / 16 | 0.59 | 0.82 |
| RV free wall strain (%) | ‐31.8 | ‐25 ‐ −40 | 0.4 ± 1.9 | ‐3.3 / 4.1 | 0.25 | ‐1 ± 6 | ‐13 / 11 | 0.27 | 0.85 |
| LA reservoir strain (%) | 43.3 | 26 ‐ 54 | 0.0 ± 4.6 | ‐8.9 / 9.0 | 0.96 | 0 ± 11 | ‐21 / 21 | 0.93 | 0.79 |
Abbreviations: ICC, intra‐class correlation coefficient; LA, left atrium; LOA, limits of agreement; LV, left ventricle; LVEDD, LV end‐diastolic diameter; LVESD, LV end‐systolic diameter; RV, right ventricle; TAPSE, tricuspid annular plane excursion; TDI, Tissue Doppler Imaging.
a
As a percentage of the mean the two measurements.
b
autoEF n = 24; manual EF n = 4.