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Correlation between AF Substrate Ablation Difficulty and Left Atrial Fibrosis Quantified by Delayed‐Enhancement Cardiac Magnetic Resonance

Background:  Studies have shown that the presence of left atrial (LA) fibrosis can be assessed by LA delayed‐enhancement cardiac magnetic resonance (LA DE‐CMR) and may be predictive of outcome after ablation for atrial fibrillation (AF). We sought to test the hypothesis that the amount of LA fibrosis evaluated by DE‐CMR correlates with the difficulty of complex fractionated atrial electrograms (CFAE) ablation.