Tachycardias pp 245-257 | Cite as

Ventricular Response In Atrial Fibrillation: Effects of AV Nodal Refractory Periods, Atrioventricular Block, and Preexcitation Syndromes

  • Frederic Fillette
  • Guy Fontaine
Part of the Developments in Cardiovascular Medicine book series (DICM, volume 28)


Aerial fibrillation (AF) is a rapid (400–600 cycles/min) and irregular activation of the atria [161M, 31S]. Successive activation fronts separated by variable time intervals pass through different pathways in the thin atrial myocardial wall [120C, 52S]. These irregularities explain the continually changing appearance of the atrial activity in the surface ECG. The temporal and spatial irregularities cause fascicular atrial movements resulting in ineffective atrial contractility. When the disorganized electrical activity reaches the atrioventricular (AV) node of Aschoff and Tawara, only a fraction of the atrial impulses conduct to the ventricles, and ventricular rhythm is irregular but the rate is slower than that of atrial fibrillation [31C]. The fraction of transmitted atrial impulses depends on several factors which are discussed below.


Atrial Fibrillation Refractory Period Accessory Pathway Versus Node Ventricular Response 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Martinus Nijhoff Publishing, Boston/The Hague/Dordrecht/Lancaster 1984

Authors and Affiliations

  • Frederic Fillette
  • Guy Fontaine

There are no affiliations available

Personalised recommendations