The alternating wide and narrow QRS complexes following prolonged PR interval is a challenging issue. The scalar diagrams with the graphic representation of the electrical events and the careful analysis of their temporal relationship can help to better understand the surface electrocardiogram.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11199837PMC
http://dx.doi.org/10.1002/joa3.13026DOI Listing

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