RT Book, Section
A1 Michaud, Gregory F.
A1 Stevenson, William G.
A2 Jameson, J. Larry
A2 Fauci, Anthony S.
A2 Kasper, Dennis L.
A2 Hauser, Stephen L.
A2 Longo, Dan L.
A2 Loscalzo, Joseph
SR Print(0)
ID 1162882831
T1 Focal Atrial Tachycardia
T2 Harrison's Principles of Internal Medicine, 20e
YR 2018
FD 2018
PB McGraw-Hill Education
PP New York, NY
SN 9781259644016
LK accesspharmacy.mhmedical.com/content.aspx?aid=1162882831
RD 2024/04/20
AB Focal  atrial  tachycardia  (AT)  can  be  due  to  abnormal  automaticity,  triggered  automaticity,  or  a  small  reentry  circuit  confined  to  the  atrium  or  atrial  tissue  extending  into  a  pulmonary  vein,  the  coronary  sinus,  or  vena  cava.  It  can  be  sustained,  nonsustained,  paroxysmal,  or  incessant.  Focal  AT  accounts  for  ~10%  of  PSVTs  in  patients  referred  for  catheter  ablation.  Nonsustained  AT  is  commonly  observed  on  24-h  ambulatory  ECG  recordings,  and  the  prevalence  increases  with  age.  In  fact,  frequent  atrial  ectopy  and  nonsustained  AT  is  often  a  precursor  to  more  significant  arrhythmias  such  as  atrial  fibrillation  and  flutter.  Though  unsustained,  frequent  atrial  ectopy  or  short  bursts  of  AT  may  be  symptomatic  and  require  therapy  similar  to  that  required  for  focal  AT.