Key result
Electrical isolation of the superior vena cava using a second-generation cryoballoon was successfully accomplished in 80.8% of patients, with transient phrenic nerve injury occurring in 19.2%.
Why the study?
The safety and efficacy of superior vena cava isolation using second-generation cryoballoon ablation remained unknown.
Is electrical isolation of the superior vena cava using a second-generation cryoballoon feasible and safe in patients with SVC-related paroxysmal atrial fibrillation?
Observational (n=26)
Is electrical isolation of the superior vena cava using a second-generation cryoballoon feasible and safe in patients with SVC-related paroxysmal atrial fibrillation?
Second-generation cryoballoon ablation for SVC isolation in paroxysmal AF is feasible but requires vigilant monitoring due to a 19.2% rate of transient phrenic nerve injury.
SVC isolation with second-generation CB may be feasible in selected patients; leaves open long-term safety and efficacy.
BACKGROUND: The safety and efficacy of superior vena cava (SVC) isolation using second-generation cryoballoon (CB) ablation remain unknown. METHODS: A total of 26 (3.2%) patients with SVC-related paroxysmal atrial fibrillation (AF) from a consecutive series of 806 patients who underwent second-generation CB were included. Pulmonary vein isolation was initially achieved by CB ablation. If the SVC trigger was determined, the electrical isolation of SVC isolation was performed using the second-generation CB. RESULTS: Real-time SVC potential was observed in all patients. Isolation of the SVC was successfully accomplished in 21 (80.8%) patients. The mean number of freeze cycles in each patient was 2.1 ± 1.1. The mean time to isolation and ablation duration were 22.5 ± 14.2 seconds and 94.5 ± 22.3 seconds, respectively. A transient phrenic nerve (PN) injury was observed in five patients (19.2%). There were two patients (7.7%) experienced reversible sinus node injury during the first application. During a mean follow-up period of 13.2 ± 5.8 months, four patients (15.4%) had atrial arrhythmia recurrences. CONCLUSION: Isolation of SVC using the second-generation 28-mm CB is feasible when SVC driver during AF is identified. Vigilant monitoring of PN function during CB ablation of SVC is needed to avoid PN injury.
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Wei et al. (2020) conducted an observational in SVC-related paroxysmal atrial fibrillation (n=26). Electrical isolation of the superior vena cava using second-generation cryoballoon was evaluated on Successful isolation of the superior vena cava. Electrical isolation of the superior vena cava using a second-generation cryoballoon was successfully accomplished in 80.8% of patients, with transient phrenic nerve injury occurring in 19.2%.
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