Table 4.

Intra-observer variability

3-D Echo measurement (first echocardiographer)	Mean ± SD	r	p-value
RV-EDV (mL)
First	80.1 ± 40.6
Second	79.9 ± 44.1	0.97	<0.001
Third	83.8 ± 44.2
RV-ESV (mL)
First	46.1 ± 33.5
Second	46.1 ± 36.3	0.98	<0.001
Third	48.4 ± 38.1
RV-SV (mL)
First	34.0 ± 16.8
Second	31.5 ± 15.4	0.86	<0.001
Third	34.6 ± 15.6
RV-EF (%)
First	44.9 ± 13.8
Second	42.8 ± 13.6	0.83	<0.001
Third	44.2 ± 14.0

3-D, three-dimensional; EDV, end-diastolic volume; EF, ejection fraction; ESV, end-systolic volume; r, intra-class correlation coefficient; RV, right ventricle; SV, stroke volume.