Comparison of non-triggered magnetic resonance imaging and echocardiography for the assessment of left atrial volume and morphology

Table 2 LA volume measurements by TTE and CE-MRA

	CE-MRA	TTE	Bias (LoA)	Bias%	Pearson r	ICC (95% CI)
All patients n = 65
LA volume, ml (±SD)	106 ± 44	78 ± 26	28 (− 22–77)	30%	0.85^a	0.86 (0.77–0.91)_a
LA volume index, ml/m² (±SD)	51 ± 22	37 ± 13	14 (− 12–39)	32%	0.87^a	0.86 (0.77–0.91)^a
Sinus Rhythm n = 14
LA volume, ml (±SD)	88 ± 24	67 ± 16	21 (−22–64)	27%	0.45	0.59 (−0.27–0.87)
LA volume index, ml/m² (±SD)	45 ± 15	34 ± 9	11 (−13–35)	28%	0.57^a	0.66 (− 0.05–0.89)^a
Atrial Fibrillation n = 11
LA volume, ml (±SD)	125 ± 28	85 ± 23	39 (13–65)	37%	0.88^a	0.93 (0.74–0.98)_a
LA volume index, ml/m² (±SD)	58 ± 13	39 ± 9	19 (4–33)	38%	0.82^a	0.87 (0.52–0.97)^a
Discordant or unknown rhythm during CE-MRA n = 40
LA volume, ml (±SD)	107 ± 50	80 ± 29	27 (−28–82)	29%	0.88^a	0.87 (0.75–0.93)^a
LA volume index, ml/m² (±SD)	51 ± 26	38 ± 15	13 (−15–41)	29%	0.90^a	0.88 (0.77–0.93)^a

Abbreviations; CE-MRA contrast enhanced magnetic resonance imaging, ICC intraclass correlation coefficient, LoA limits of agreement, TTE transthoracic echocardiography
^aSignificant at p < 0.05

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