P435Is it safe to implant a leadless pacemaker in patients with existing CIEDs? Experience from the Micra post market registry. (20th June 2017) - El-Chami, M.; Kowal, R.; Johansen, JB.; Zaidi, O.; Mont, L.; Iacopino, S.; Faerestrand, S.; Li, S.; Van Osch, D.; Roberts, P.