Novel Observations on the Precursor Arrhythmias of Ventricular Fibrillation in the Ambulatory Setting

Across 71 Philips MCOT® events, VF was most commonly preceded by Ectopy, followed by re-polarization changes and rate dependent changes. While previous reports have suggested monomorphic VT as commonly preceding VF, monomorphic VT was only noted in 38% of patients in this cohort.