Abstract
A 42-year old female with no significant past medical history, normal physical exam, and normal routine lab studies presents with “thumps” in her chest. A Holter monitor evaluation revealed normal sinus rhythm with two different PR intervals suggesting “dual AV nodal pathways” and occasional blocked P waves with junctional escape complexes. The behavior was most suggestive that no conduction through either pathway reached the His bundle, suggesting distal block must be beyond each pathway, but still within the AV node. These strips are shown. Their interpretation is discussed, along with the underlying explanation and significance.
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