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Dynamic Effects of Exercise and Different Escape Rhythms on the Supernormal Period of an Accessory Pathway
Author(s) -
LUM JEREMY J.,
HO REGINALD T.
Publication year - 2007
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/j.1540-8167.2006.00740.x
Subject(s) - medicine , rhythm , period (music) , heart rhythm , physical medicine and rehabilitation , neuroscience , cardiology , physics , acoustics , biology
Spontaneous conduction during the supernormal period (SNP) of accessory pathways (AP) is rare and observed only during atrio‐ventricular block (AVB). The effect of exercise and different escape rhythms on the SNP is unknown. We evaluated these factors on the SNP of a para‐Hisian AP after a failed ablation complicated by AVB. The SNP onset and duration were later and longer during paced versus junctional rhythm. Exercise caused linear shortening of the SNP that was directly related to junctional cycle length. The SNP is a dynamic window shifting in parallel with AP refractoriness and affected by exercise and type of escape rhythm.