Key result
Adding SVC isolation to AF ablation cuts atrial tachycardia recurrence ~29%.
Why the study?
Non-pulmonary vein foci, frequently located in the superior vena cava, contribute to AF initiation and maintenance, warranting evaluation of adjunctive SVC isolation.
Does concurrent superior vena cava isolation improve freedom from atrial tachycardia compared to ablation without SVC isolation in patients undergoing atrial fibrillation ablation?
Meta-Analysis (n=2,176)
Does concurrent superior vena cava isolation improve freedom from atrial tachycardia compared to ablation without SVC isolation in patients undergoing atrial fibrillation ablation?
Adjunctive superior vena cava isolation during atrial fibrillation ablation, particularly using radiofrequency energy, significantly improves freedom from atrial tachycardia compared to standard ablation alone.
Supports adjunctive SVC isolation during AF ablation; confirms benefit in this meta-analysis.
Background Pulmonary vein (PV) isolation is the mainstay in atrial fibrillation (AF) ablation. However, additional arrhythmogenic foci seem to contribute to AF initiation and maintenance. A great proportion of those non-PV foci have been reported to be located in the superior vena cava. Purpose We aimed to investigate the effectiveness of SVC isolation as an adjunctive therapy to PV isolation. Methods We performed a systematic review of MEDLINE and CENTRAL. Inclusion criteria were cohort studies with control group or randomized clinical trials, comparing patients undergoing AF ablation without additional SVC isolation to those receiving ablation with concurrent SVC isolation, in effects of freedom from atrial tachycardia. Results A total of 10 studies, incorporating 2.176 patients, were included. The majority of the patients (91.5%) expressed paroxysmal AF. The additional SVC isolation strategy in patients undergoing AF ablation was more effective than the non- SVC isolation strategy (odds ratio = 0.71; 95% confidence interval, 0.55-0.92). In a subgroup analysis, radiofrequency ablation demonstrated effectiveness (odds ratio = 0.69; 95% confidence interval, 0.53-0.92). Conversely, the use of cryoablation did not alter clinical outcomes (odds ratio = 0.69; 95% confidence interval, 0.13- 3.61). In a distinct subgroup analysis, SVC isolation guided by induction of SVC-originating AF triggers—versus no isolation when no AF-inducing triggers were observed- yielded no superiority (OR = 0.73; 95% confidence interval, 0.46–1.16). Conclusions The outcomes of AF ablation are favorable when additional SVC isolation is conducted. In a tailored care approach, radiofrequency energy should be preferred, and periprocedural induction of SVC-originating AF triggers should not be used as a criterion for performing SVC isolation. These findings support integrating SVC isolation into individualized ablation strategies to optimize patient outcomes.Figure 1Figure 2
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Botis et al. (2026) conducted a meta-analysis in Atrial fibrillation (n=2,176). Concurrent superior vena cava (SVC) isolation vs. AF ablation without additional SVC isolation was evaluated on Freedom from atrial tachycardia (OR 0.71, 95% CI 0.55-0.92). Additional superior vena cava isolation during atrial fibrillation ablation was more effective than non-SVC isolation (OR 0.71; 95% CI 0.55-0.92).
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