Vagal responses during PV isolation are

• A. They Occur During PV Isolation
• B. They Never Occur
• C. They Occur Only With Certain Energy Settings
• D. They Occur Only With Non-Irrigated Catheters

Answer: (A)

Vagal responses during PV isolation occur because the area around the pulmonary vein ostia contains dense autonomic innervation, including ganglionated plexi that provide parasympathetic (vagal) input to the heart. When ablation lesions touch or disrupt these autonomic fibers, a vagal reflex can be triggered, leading to transient bradycardia, AV conduction slowing or block, and sometimes hypotension. This reflex is driven by the local anatomy and neural connections, not by a specific energy setting or catheter type, so it can happen across a range of ablation energies and with both irrigated and non-irrigated catheters. If it occurs, the typical approach is to pause energy delivery and manage the hemodynamics, sometimes with atropine if needed. The takeaway is that vagal responses are a known, predictable consequence of targeting autonomic tissue near the pulmonary veins, rather than something limited to particular equipment or settings.