Table 1.
Intra-examination precision of transthoracic echocardiography measurements in sinus rhythm
| TTE parameters | One measurement | Two measurements | Three measurements | Four measurements | Five measurements |
|---|---|---|---|---|---|
| LV parameters | |||||
| E wave | 7 [4–11]% | 5 [3–8]% | 4 [2–6]% | 4 [2–6]% | 3 [2–5]% |
| A wave | 8 [4–11]% | 6 [3–8]% | 5 [2–6]% | 4 [2–5]% | 6 [3–8]% |
| e’ wave | 9 [5–14]% | 6 [3–10]% | 5 [3–8]% | 5 [2–7]% | 4 [2–6]% |
| E/A ratio | 10 [5–14]% | 7 [4–10]% | 6 [3–8]% | 5 [3–7]% | 4 [2–6]% |
| E/e’ ratio | 12 [8–18]% | 8 [6–13]% | 7 [5–11]% | 6 [4–9]% | 5 [4–8]% |
| s’ wave | 9 [6–13]% | 6 [4–9]% | 5 [3–8]% | 4 [3–7]% | 4 [3–6]% |
| VTI | 6 [4–9]% | 4 [3–7]% | 4 [2–5]% | 3 [2–5]% | 3 [2–4]% |
| LVEF | 14 [7–17]% | 10 [5–12]% | 8 [4–10]% | 7 [3–8]% | 6 [3–7]% |
| RV parameters | |||||
| TAPSE | 7 [5–11]% | 5 [4–8]% | 4 [3–6]% | 4 [3–6]% | 3 [2–5]% |
| S wave | 8 [4–12]% | 6 [3–8]% | 5 [2–7]% | 4 [2–6]% | 3 [2–5]% |
| LV and RV dimensions | |||||
| LVEDA | 7 [5–11]% | 5 [3–8]% | 4 [3–6]% | 4 [2–5]% | 3 [2–5]% |
| RVEDA | 9 [6–14]% | 7 [4–10]% | 5 [3–8]% | 5 [3–7]% | 4 [3–6]% |
| RVEDA/LVEDA | 11 [7–16]% | 8 [5–12]% | 6 [4–9]% | 6 [3–8]% | 5 [3–7]% |
n = 84, data are summarised as median [interquartile range]
LV left ventricular, RV right ventricular, TTE transthoracic echocardiography, E early peak velocity of transmitral flow with pulsed Doppler, A atrial peak velocity of transmitral flow with pulsed Doppler, e’ early diastolic peak velocity of the lateral mitral annulus with tissue Doppler imaging, s’ systolic peak velocity of the lateral mitral annulus with tissue Doppler imaging, VTI velocity-time integral of the left ventricular outflow tract, LVEF left ventricular ejection fraction, TAPSE tricuspid annular plane systolic excursion, S systolic peak velocity of the tricuspid annulus with tissue Doppler imaging, LVEDA left ventricular end-diastolic area, RVEDA right ventricular end-diastolic area