Key result
Paroxysmal AF links to APD restitution slopes >1 near pulmonary veins, enabling PACs to initiate AF.
Why the study?
Human left atrial action potential duration restitution and its relationship to the initiation of atrial fibrillation by single premature atrial complexes had not been studied.
Does an APD restitution slope >1 near pulmonary veins explain the initiation of clinical AF by single premature atrial complexes in patients with paroxysmal and persistent AF?
Observational (n=27)
Does an APD restitution slope >1 near pulmonary veins explain the initiation of clinical AF by single premature atrial complexes in patients with paroxysmal and persistent AF?
Absolute Event Rate: 1.5% vs 0.7%
p-value: p=<0.001
In patients with paroxysmal AF, an APD restitution slope >1 near the pulmonary veins enables single premature atrial complexes to initiate AF, whereas in persistent AF, dynamic activation delay flattens this restitution.
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APD restitution findings remain hypothesis-generating in paroxysmal AF; should not yet alter clinical practice or guide therapy.
Narayan et al. (2008) conducted an observational in Atrial fibrillation (n=27). Paroxysmal atrial fibrillation vs. Persistent atrial fibrillation was evaluated on Maximum left atrial action potential duration (APD) restitution slope (p=<0.001). Paroxysmal atrial fibrillation was associated with a maximum APD restitution slope >1 near pulmonary veins compared to persistent AF (1.5 vs 0.7, p<0.001), enabling single PACs to initiate AF.