Empiric and Trigger-Guided Superior Vena Cava Isolation in AF Ablation: Systematic Review and Meta-Analysis

Area of Science:

• Electrophysiology
• Cardiovascular Medicine
• Interventional Cardiology

Background:

• Superior vena cava isolation (SVCI) is an adjunctive procedure to pulmonary vein isolation (PVI) for atrial fibrillation (AF).
• The optimal strategy for SVCI (empiric vs. trigger-guided) remains unclear, particularly in meta-analyses focusing on index procedures for paroxysmal AF.

Purpose of the Study:

• To systematically review randomized controlled trials (RCTs) comparing PVI+SVCI versus PVI alone.
• To stratify the analysis by SVCI strategy: empiric (irrespective of SVC ectopy) versus trigger-guided (based on demonstrated SVC triggers).
• To evaluate the impact of SVCI on atrial tachyarrhythmia recurrence and procedural outcomes.

Main Methods:

• Systematic review and meta-analysis of RCTs comparing PVI+SVCI versus PVI alone, searched through November 2025.
• Primary outcome: atrial tachyarrhythmia recurrence beyond the blanking period.
• Random-effects models, subgroup analyses, meta-regression, and GRADE certainty assessment were employed.

Main Results:

• Eight RCTs (n=1231) showed that PVI+SVCI significantly reduced recurrence versus PVI alone (RR 0.77).
• Empiric SVCI demonstrated a significant recurrence reduction (RR 0.70), while trigger-guided SVCI did not reach statistical significance (RR 0.80).
• Adjunctive SVCI significantly reduced recurrence in paroxysmal AF; fluoroscopy time increased, but procedure duration was comparable. Major complications were numerically higher with SVCI+PVI.

Conclusions:

• Empiric SVCI significantly reduces atrial tachyarrhythmia/atrial fibrillation recurrence as an adjunct to PVI.
• Trigger-guided SVCI did not show a significant benefit in recurrence reduction.
• Findings support the role of empiric SVCI as an adjunct to AF ablation, independent of prior trigger documentation.