Because PAC "A" in this tracing is preceded by a longer R-R interval than PAC "B," a manifestation of Ashman's phenomenon. [1,2,3] The length of the refractory period is proportionally related to the ...
The R-R interval is the same as the P-P interval plus whatever change there is in the PR interval. In typical AV Wenckebach phenomenon, the PR intervals increase with decreasing increments and the R-R ...
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