The impact of different geometric assumption of mitral annulus on the assessment of mitral regurgitation volume by Doppler method

Table 3 Results of Pearson’s correlation and Bland-Altman analysis for MRvol by QPD and reference methods

Method	MRvol (ml)	Pearson’s correlation analysis		Bland-Altman analysis
Method	MRvol (ml)	r	p	Mean difference (ml)	95% limits of agreement (ml)	p
Circular assumption
QPD-MA_PLAX	66.4 ± 41.1	0.574	<0.0001	22.5	− 43.6 ~ 88.6	<0.0001
QPD-MA_A4C	54.3 ± 27.6	0.822	<0.0001	10.4	−20.6 ~ 41.4	<0.0001
QPD-MA_A2C	38.4 ± 20.6	0.805	<0.0001	−5.5	−31.7 ~ 20.2	0.0002
RT3DE	43.9 ± 21.3
Ellipse assumption
QPD-MA_{PLAX + A4C}	59.1 ± 29.5	0.789	<0.0001	15.2	−20.5 ~ 51.0	<0.0001
QPD-MA_{PLAX + A2C}	50.6 ± 25.6	0.776	<0.0001	6.8	−24.9 ~ 38.5	0.0002
QPD-MA_{A4C + A2C}	45.6 ± 21.5	0.905	<0.0001	1.7	−16.6 ~ 20.1	0.0844

QPD-MA_PLAX MRvol was measured by QPD using circular geometric assumption, and the MA diameter was measured in PLAX view, QPD-MA_{PLAX + A4C} MRvol was measured by QPD using ellipse assumption, and the MA diameter was measured in PLAX and A4C view, RT3DE MRvol was measured using EROA multiplied by the VTI_MR

ISSN: 1476-7120