for greater than 15 hours, risk of induction of other arrhythmias including tachyarrhythmias requiring further management including cardioversion or risk of bradyarrhythmias, in the past when we had a cardioverter with 150 joules, he did have a 5.5-second pause especially while he is on antiarrhythmic therapy, statistically less significant risk of CVA, although we cannot really make that null. 
for greater than 15 hours , risk of induction of other arrhythmias including tachyarrhythmias requiring further management including cardioversion or risk of bradyarrhythmias , in the past when we had a cardioverter with 150 joules , he did have a 5.5 - second pause especially while he is on antiarrhythmic therapy , statistically less significant risk of CVA , although we can not really make that null .