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The last few decades have given rise to extensive research focused on atrial conduction disorders, identified by ECG, and their clinical relevance. Most notably, the observed associations of interatrial block, supraventricular arrhythmias, and increased risk of cardiovascular mortality have driven further research, and in particular into determining the role of interatrial block as a novel risk factor of stroke. Interatrial blocks are characterized by P-wave duration ≥120 ms with left atrial retrograde activation that signifies a conduction delay between the left and right atria.1 Similar to other types of heart block, interatrial block may be partial (first-degree) or advanced (third-degree).1 Advanced interatrial block (aIAB), also termed Bayés syndrome, indicates atrial fibrosis and abnormal cardiac modeling. Although common in patients with aIAB,1,2 left atrial enlargement is not a necessary component of a diagnostic criteria.
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- © 2016 American Academy of Neurology
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