Table 2.

Univariate and multivariate Cox regression analyses in terms of VT/VF recurrence

	Univariate analysis			Multivariate analysis
Variables	Hazard ratio	95% CI	p-value	Hazard ratio	95% CI	p-value
Atrial fibrillation (paroxysmal and persistent)	1.095	0.584 ~ 2.052	0.777
LVEF (%)	0.986	0.970 ~ 1.001	0.074
LVEF ≦ 30%	1.995	1.064 ~ 3.740	0.031
LVEDV (mL)	1.004	1.000 ~ 1.007	0.028
LVEDV > 163.5 mL	2.042	1.170 ~ 3.562	0.012	2.549	1.249 ~ 5.201	0.010
LVESV (mL)	1.004	1.001 ~ 1.008	0.025
Heart failure NYHA functional class ≧ 3	1.293	0.688 ~ 2.430	0.425
QRS width (msec)	1.008	1.000 ~ 1.016	0.059
QRS width > 125 msec	2.067	1.003 ~ 4.260	0.049	2.173	1.030 ~ 4.586	0.042
Ischemic cardiomyopathy	0.998	0.580 ~ 1.717	0.995
Dilated cardiomyopathy	0.851	0.437 ~ 1.655	0.634
Anti-arrhythmic drugs	0.611	0.298 ~ 1.252	0.178
Post VT ablation	0.844	0.272 ~ 2.615	0.768

*Abbreviations: VT ventricular tachycardia, VF ventricular fibrillation, CI confidence interval, LVEF left ventricular ejection fraction, LVEDV left ventricular end diastolic volume, LVESV left ventricular end systolic volume, NYHA New York Heart Association