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After the atrial pace premature ventricular contraction (PVC) response algorithm was disabled, PVCs occurred without closely coupled atrial pacing. Of note, the intrinsic atrial activity early in the extended postventricular atrial refractory period likely would be too early to result in long–short induced atrial fibrillation even if the PVC response had remained on. LV = left ventricle; RV = right ventricle.
