RT Book, Section
A1 Teply, Robyn
A1 Packard, Kathleen
A2 Sutton, S. Scott
SR Print(0)
ID 1158313606
T1 Arrhythmias
T2 McGraw-Hill's NAPLEX® Review Guide, 3e
YR 2019
FD 2019
PB McGraw-Hill Education
PP New York, NY
SN 9781260135923
LK accesspharmacy.mhmedical.com/content.aspx?aid=1158313606
RD 2022/05/19
AB Cardiac  arrhythmia  is  an  abnormality  of  impulse  generation,  impulse  propagation,  or  a  combination  of  both.  Normal  conduction  and  cardiac  rhythm  are  initiated  by  the  sinoatrial  (SA)  node.  The  electrical  current  then  travels  through  the  conduction  network  and  enters  the  ventricle  via  the  atrioventricular  (AV)  node  and  bundle  of  His.  From  the  bundle  of  His,  the  electrical  activity  moves  into  the  branch-like  system  called  the  Purkinje  system.  As  the  current  flows  through  the  myocardium,  the  excitation  coordinates  the  contraction  of  the  atria  and  ventricles.  After  stimulation,  each  group  of  cells  experiences  a  refractory  period  in  which  it  cannot  be  excited.  As  the  electrical  current  meets  refractory  tissue,  the  stimulation  ceases  allowing  for  the  process  to  begin  again.