RT Book, Section
A1 Zimmerman, Franklin H.
SR Print(0)
ID 1200100844
T1 Aberrant Conduction
T2 ECG Core Curriculum
YR 2023
FD 2023
PB McGraw Hill Education
PP New York, NY
SN 9780071785211
LK accesscardiology.mhmedical.com/content.aspx?aid=1200100844
RD 2024/04/19
AB A  supraventricular  impulse  results  in  a  narrow  QRS  complex  by  virtue  of  rapid  synchronous  conduction  through  the  His-Purkinje  system,  finally  reaching  the  ventricular  myocardium.  As  we  have  learned  previously,  a  fixed  conduction  delay  or  interruption  in  the  bundle  branches  or  their  divisions  produces  abnormalities  of  QRS  complex  morphology  that  we  know  as  bundle  branch  block  or  fascicular  block.  The  ECG  findings  include  alterations  in  QRS  complex  duration,  amplitude,  configuration,  and  axis.  The  term  aberration  (or  aberrant  ventricular  conduction)  is  used  to  describe  transient  bundle  branch  block  and  fascicular  block  that  are  unrelated  to  preexisting  bundle  branch  block,  preexcitation,  or  the  effects  of  drug  or  electrolyte  abnormalities.  This  temporary  alteration  of  conduction,  also  called  phasic  aberrant  ventricular  conduction,  is  due  to  differential  refractoriness  of  the  bundle  branches  combined  with  variances  in  cycle  length,  concepts  that  we  will  now  review.