Premium
“Supernormal” Conduction and Excitability
Author(s) -
MOORE E. NEIL,
SPEAR JOSEPH F.,
FISCH CHARLES
Publication year - 1993
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.1540-8167.1993.tb01234.x
Subject(s) - refractory period , thermal conduction , medicine , depolarization , electrical conduction system of the heart , effective refractory period , cardiology , electrocardiography , physics , thermodynamics
“Supernormal” Conduction and Excitability. Electrocardiograph manifestation of “supernormal” conduction is defined as conduction that is more rapid than expected or presence of conduction when block is anticipated. It is not supernormal in the sense of being more rapid than normal. Therefore, the term relative supernormality or “supernormality” is more appropriate. The mechanism of “supernormal” conduction is conduction during a period of supernormal excitability and conduction associated with altered membrane potential. Some of the more common phenomena that are not dependent on conduction during the supernormal period but manifest better than expected conduction, thus simulating “supernormal” conduction, include dual AV nodal conduction, the “gap” phenomenon, “peeling back” of the refractory period, summation of subthreshold responses, diastolic phase 4 depolarization, and phasic autonomic influences.