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Table 4 Predictors of right atrial enlargement according to RA volume index

From: Reference right atrial dimensions and volume estimation by steady state free precession cardiovascular magnetic resonance

Univariate analysis: OR 95%CI p value Chi square
4-chamber longitudinal diameter (>6.6 cm) 13.6 6.97, 26.62 <0.001 NA
4-chamber transverse diameter (>5.8 cm) 5.0 2.41, 10.37 <0.001 18.7
4-chamber area (>30 cm2) 17.05 6.99, 41.17 <0.001 39.2
2-chamber longitudinal diameter (>6.5 cm) 9.6 4.14, 22.36 <0.001 27.7
2-chamber transverse diameter (>5.7 cm) 12.1 4.89, 30.12 <0.001 29
2-chamber area (>29 cm2) 21.6 6.83, 68.14 <0.001 27.4
4-chamber longitudinal diameter indexed (>3.6 cm/m2) 8.4 4.14, 17.12 <0.001 34.5
4-chamber transverse diameter indexed (>3.2 cm/m2) 8.4 3.29, 21.45 <0.001 19.8
4-chamber area indexed (>15 cm2/m2) 10.8 4.66, 25.18 <0.001 30.7
2-chamber longitudinal diameter indexed (>3.5 cm/m2) 12.0 3.71, 38.82 <0.001 17.2
2-chamber transverse diameter indexed (>3.2 cm/m2) 8.7 3.67, 20.44 <0.001 24.3
2-chamber area indexed (>16 cm2/m2) 38.5 9.55, 154.82 <0.001 26.4
Multivariate analysis (indexed parameters): OR 95%CI p value Chi square
2-chamber area indexed (>16 cm2/m2) 6.71 2.35, 19.13 <0.001 32.9
2-chamber longitudinal diameter indexed (>3.5 cm/m2) 7.78 2.14, 28.35 0.002  
  1. The upper limit of normal is shown in brackets according to Table 2.