RT Book, Section
A1 Zimmerman, Franklin H.
SR Print(0)
ID 1200101297
T1 Ventricular Arrhythmias
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=1200101297
RD 2025/01/23
AB A  premature  depolarization  that  originates  in  the  ventricular  myocardium  or  terminal  Purkinje  fibers  is  termed  a  ventricular  premature  complex  (VPC).  The  impulse  is  initiated  outside  of  the  specialized  conduction  system,  activating  the  nearby  myocardium  via  slow,  myocyte-to-myocyte  transmission.  The  impulse  then  engages  the  His-Purkinje  system  to  depolarize  the  remaining  myocardium.  We  know  that  this  type  of  transmission  produces  a  wide  QRS  complex  (≥0.12  seconds)  with  secondary  T  wave  abnormalities  that  are  directed  opposite  to  that  of  the  dominant  R  wave  (Figure  19-1).