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Published on: May 26, 2015
Characterisation and Enhanced Residual Risk Stratification of Long-Term Post-Discharge Ischaemic Events After Atrial
Hironori Ishiguchi1, Shintaro Hashimoto1, Yasuhiro Yoshiga1
1Department of Medicine and Clinical ScienceDivision of Cardiology, Yamaguchi University School of Medicine Graduate School of MedicineUbe, Yamaguchi PrefectureJapan.
Summary
Post-catheter ablation for atrial fibrillation (AF), ischemic events are uncommon but persist. A new model combining CHA₂DS₂-VASc score and left atrial volume index (LAVI) improves risk prediction for these events.
Area of Science:
- Cardiology
- Electrophysiology
- Thrombosis Research
Background:
- Residual thromboembolic risk persists after catheter ablation for atrial fibrillation (AF).
- Long-term post-ablation ischemic events are poorly understood, complicating risk stratification.
- Characterizing these events and developing improved risk models is crucial.
Purpose of the Study:
- To characterize long-term ischemic events following AF catheter ablation.
- To develop and validate an enhanced risk stratification model for post-ablation ischemic events.
- To assess the predictive value of existing scores and novel parameters like LAVI.
Main Methods:
- Single-center historical cohort study of 1,163 patients undergoing initial AF ablation.
- Primary endpoint: composite of postdischarge ischemic events (stroke, TIA, systemic embolism).
- Comparison of CHA₂DS₂-VASc score, LAVI, and a combined model for risk prediction.
Main Results:
- A median follow-up of 5.1 years revealed a 2.1% incidence of ischemic events (0.38 per 100 person-years).
- Events were of mixed etiology (42% AF-related), with 54% occurring during sinus rhythm.
- The combined CHA₂DS₂-VASc and LAVI model demonstrated improved discrimination and reclassification over CHA₂DS₂-VASc alone.
Conclusions:
- Post-ablation ischemic events are infrequent but diverse in etiology, including non-cardioembolic causes.
- A combined risk model integrating CHA₂DS₂-VASc and LAVI offers modest incremental value for residual risk stratification.
- Enhanced risk assessment is vital for managing patients post-AF ablation.
