Propafenone added to ibutilide increases conversion rates of persistent atrial fibrillation. - Korantzopoulos, P.; Kolettis, T. M.; Papathanasiou, A.; Naka, K. K.; Kolios, P.; Leontaridis, I.; Draganigos, A.; Katsouras, C. S.; Goudevenos, J. A. (Heart, 2006)