Key result
Cryoballoon application for the isolation of a right superior pulmonary vein induced an electrical conduction block between the right atrium and superior vena cava connection in a 53-year-old male.
Case Report (n=1)
Cryoballoon ablation for right superior pulmonary vein isolation can inadvertently cause electrical conduction block at the right atrium-superior vena cava junction.
Potential inadvertent RA-SVC block warrants monitoring during RSPV cryoballoon ablation; single case leaves open incidence and relevance.
A 53-year-old male underwent a pulmonary vein isolation (PVI) of atrial fibrillation (AF) with a second-generation cryoballoon (CB). Although the patient maintained sinus rhythm after the PVI, a superior vena cava (SVC) fibrillation was recorded by a circular-multipolar-electrode catheter positioned inside the SVC that suggested conduction block between the right atrium (RA)-SVC connection. An adenosine triphosphate intravenous injection induced a dormant reconnection of the SVC myocardial sleeve and converted sinus rhythm to an AF rhythm. This case demonstrated that a CB application for the isolation of a right superior pulmonary vein could induce an electrical conduction block between the RA-SVC connection.
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Watanabe et al. (2018) conducted a case report in Atrial fibrillation (n=1). Pulmonary vein isolation with a second-generation cryoballoon was evaluated on Bidirectional conduction block within the superior vena cava. Cryoballoon application for the isolation of a right superior pulmonary vein induced an electrical conduction block between the right atrium and superior vena cava connection in a 53-year-old male.
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