A patient with a long R-R interval is more likely to experience which conduction phenomenon?

A long R-R interval indicates a slower heart rate, which can predispose the patient to various conduction phenomena. In this context, Ashman's phenomenon is particularly relevant. This phenomenon occurs in the setting of an irregularly irregular rhythm, where a long R-R interval leads to an aberrantly conducted beat. This can be seen in patients with conditions such as atrial fibrillation or other forms of irregular rhythms, where the heart's electrical conduction system is disrupted.

When a long R-R interval is present, the heart may conduct impulses differently due to altered refractory periods. This difference can lead to a situation where a premature beat, typically occurring after a longer than usual interval, is conducted abnormally through the His-Purkinje system, resulting in a widening of the QRS complex or an aberrant beat.

Understanding the context of Ashman’s phenomenon is crucial for recognizing that it is not merely a random occurrence; rather, it is influenced by the intrinsic conduction properties of the heart during varying intervals. This illustrates why a long R-R interval can lead to this specific conduction phenomenon.