Ventricular proarrhythmic effects of ventricular cycle length and shock strength in a sheep model of transvenous atrial defibrillation.

Synchronized transvenous atrial defibrillation shocks delivered on beats with a short preceding ventricular cycle length (< 300 milliseconds) are associated with a significantly increased risk of initiation of VF. To decrease the risk of ventricular proarrhythmia, short CLs should be avoided.