RT Book, Section
A1 Zimmerman, Franklin H.
SR Print(0)
ID 1200100968
T1 Atrioventricular Conduction Abnormalities
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=1200100968
RD 2024/04/19
AB The  term  normal  sinus  rhythm  indicates  depolarization  by  the  sinus  pacemaker  at  a  standard  rate  (60-100  bpm)  followed  by  normal  atrial  depolarization  and  atrioventricular  (AV)  conduction  to  the  ventricles.  This  requires  perfect  coordination  of  the  entire  specialized  conduction  system  so  that  every  P  wave  is  accompanied  by  a  normal  PR  interval  and  then  by  a  QRS  complex.  The  structures  of  the  specialized  conduction  system  include  the  SA  node,  interatrial  and  internodal  bundles,  the  AV  junction  (subdivided  into  the  AV  node  and  the  bundle  of  His),  the  bundle  branches,  and  the  Purkinje  fibers.  Abnormalities  of  AV  conduction  can  arise  anywhere  along  this  route,  which  produce  the  ECG  findings  that  we  will  review  in  this  chapter.