Key result
Homogeneous conduction velocity is linked to ~77% lower arrhythmia risk in adult congenital heart disease.
Why the study?
Ultra-high-density mapping enables detailed mechanistic analysis of atrial reentrant tachycardia but had not been used to evaluate circuit conduction velocity patterns in adults with congenital heart disease.
Does ultra-high-density mapping-guided conduction velocity analysis distinguish atrial reentrant patterns and predict postablation conduction block in adults with congenital heart disease?
Observational (n=136)
Yes
Does ultra-high-density mapping-guided conduction velocity analysis distinguish atrial reentrant patterns and predict postablation conduction block in adults with congenital heart disease?
Absolute Event Rate: 90% vs 57%
p-value: p=0.04
Ultra-high-density mapping reveals that surgical obstacles produce slower and smaller circuits in adult congenital heart disease, and non-isthmus conduction time can predict postablation block.
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May identify lower-risk patients post-ablation in adult congenital heart disease; leaves open whether mapping-guided strategies warrant prospective trials.
Kahle et al. (2021) conducted an observational in Intra-atrial reentrant tachycardia in adult congenital heart disease (n=136). Ultra-high-density mapping was evaluated on Arrhythmia-free survival for homogeneous versus non-homogeneous conduction velocity patterns (p=0.04). In adults with congenital heart disease, homogeneous conduction velocity patterns were associated with better arrhythmia-free survival over >1 year of follow-up (90% vs 57%; P=0.04).
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