Extremally rare cause of AV block during typical atrial flutter ablation not related to conduction tissue injury.
Khushal ChoudharyLeonell Freytes SantiagoDaniel ReadeDejan TojcicAhmad JalladAdam S BudzikowskiPublished in: Pacing and clinical electrophysiology : PACE (2023)
The most likely explanation for the transient AV block during the ablation procedure is that there was reversible injury to the tissue strip between the CTI and the CS os, which is critical for the activation of the AV node.