Revisiting left atrial volumetry by magnetic resonance imaging: the role of atrial shape and 3D angle between left ventricular and left atrial axis

Table 2 Bland–Altman statistics of repeated measurements (n = 20)

	Bias (95% CI)	Limits of agreement (bias ± 2SD)	ICC (95% CI)
Intra-observer
Maximum LAV_SAX (mL)	− 0.9 (− 2.3 to 0.5)	(− 6.9 to 5.0)	0.98 (0.96–0.99)*
3DS at maximum LA volume (% points)	− 0.4 (− 0.9 to 0.2)	(− 2.8 to 2.1)	0.94 (0.86–0.98)*
LA axis rotation angle to 4CH plane (°)	1.5 (− 0.9 to 4.0)	(− 9.0 to 12.1)	0.94 (0.85–0.97)*
Inter-observer
End-diastolic LA-LV angle (°)	0.1 (− 1.8 to 2.0)	(− 8.1 to 8.3)	0.77 (0.50–0.90)*
End-systolic LA-LV angle (°)	− 0.6 (− 2.5 to 1.3)	(− 8.7 to 7.5)	0.81 (0.58–0.92)*

3DS 3D sphericity, CI confidence interval, ICC intraclass correlation, LA-LV angle 3D angle between left atrial and left ventricular axes, LAV_SAX measured left atrial volume by 3D segmentation, SD standard deviation
*p < 0.001

ISSN: 1471-2342