Table 4

Association of CMR with first-onset atrial arrhythmia during follow-up

Patient factors (n=65)	Per*	HR	95% CI	p Value†
Right heart CMR measures
Functional right atrial indexed volume	↑5 mL/m²	*1.026*	**1.008 to 1.044**	0.005
Native right atrial indexed volume	↑5 mL/m²	*1.026*	**1.008 to 1.044**	0.005
Atrialised RV indexed volume	↑5 mL/m²	1.046	0.967 to 1.132	0.262
Tricuspid regurgitant fraction	↑1%	1.015	0.986 to 1.044	0.314
Apical septal leaflet displacement	↑1 mm	1.035	0.992 to 1.081	0.112
Apical septal leaflet displacement/LV septal length	↑1%	*1.034*	**1.001 to 1.068**	*0.041*
Functional RV end diastolic volume	↑5 mL/m²	*1.046*	**1.004 to 1.089**	*0.033*
Functional RV stroke volume index	↓10 mL/m²	0.923	0.769 to 1.109	0.394
Functional RV ejection fraction	↓5%	*1.543*	**1.103 to 2.160**	*0.011*
Left heart CMR measures
LV end diastolic volume index	↑5 mL/m²	0.926	0.813 to 1.056	0.253
LV stroke volume index	↓10 mL/m²	1.346	0.857 to 2.110	0.197
LV ejection fraction	↓5%	1.040	0.951 to 1.136	0.395
Cardiac index	↓100 mL/min/m²	1.001	0.997 to 1.005	0.594
Combined right and left CMR heart measures
Functional RV/LV end diastolic indexed volume ratio	↑1 unit	*1.546*	**1.140 to 2.097**	*0.005*
Total right/left volume index	↑1 unit	*1.183*	**1.063 to 1.317**	*0.002*
Severity Index volume	↑1 unit	2.626	0.672 to 10.259	0.165

*Unit change in the parameter tested for hazard analysis is based on clinical relevance.
†p Values are derived from univariable Cox proportional hazard analysis.
CMR, cardiovascular magnetic resonance; LV, left ventricular; RV, right ventricular.
Significant univariable predictors of first-onset sustained atrial arrhythmia are formatted bold and italic.