Key result
This case report presents the first known observation of intermittent advanced interatrial block, demonstrating that advanced IAB can resolve to its partial, incomplete type.
Case Report (n=1)
This case report provides the first evidence that advanced interatrial block can be intermittent and resolve to a partial block.
Advanced IAB regression may occur; hypothesis-generating and requires prospective validation before clinical consideration.
Abnormal atrial depolarization, characterized by P waves > or =110 ms on the electrocardiogram, can manifest as partial or advanced interatrial block (IAB). Advanced IAB, denoted by biphasic P waves in leads II, II and aVF, is considered to confer increased severity in interatrial conduction delay, and is now perceived to be a result of continued deterioration in interatrial impulse propagation between the atria. While progression from partial to advanced IAB has been described, the converse, resolution of advanced IAB, which has often been touted as 'complete block' to its partial, 'incomplete' type, i.e. the occurrence of intermittent advanced IAB, has escaped observations so far. We present the first known report of such a scenario.
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Ariyarajah et al. (2007) conducted a case report in Intermittent advanced interatrial block (n=1). Intermittent advanced interatrial block was evaluated on Occurrence of intermittent advanced interatrial block. This case report presents the first known observation of intermittent advanced interatrial block, demonstrating that advanced IAB can resolve to its partial, incomplete type.
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