Gw. Botteron et Jm. Smith, A TECHNIQUE FOR MEASUREMENT OF THE EXTENT OF SPATIAL-ORGANIZATION OF ATRIAL ACTIVATION DURING ATRIAL-FIBRILLATION IN THE INTACT HUMAN HEART, IEEE transactions on biomedical engineering, 42(6), 1995, pp. 579-586
Atrial fibrillation (AF) is a common clinical problem, associated with
considerable morbidity and mortality, for which effective management
strategies have yet to be devised, The absence of objective measures t
o guide selection of antiarrhythmic drug therapy for maintenance of si
nus rhythm leaves only clinical endpoints (either beneficial or detrim
ental) for assessment of drug action, with occasional catastrophic con
sequences. As part of an attempt to provide an objective framework for
the assessment of antiarrhythmic drug action on the electrophysiologi
c determinants of atrial fibrillation, we have developed a measure of
the spatial organization of atrial activation processes during atrial
fibrillation. By recording activation sequences at multiple equally sp
aced locations on the endocardial surface of the atria during atrial f
ibrillation in humans and determining the degree of correlation betwee
n these activation sequences as a function of distance, we have been a
ble to construct spatial correlation functions for atrial activation,
We have found that atrial activation remains well-correlated, independ
ent of distance during normal sinus rhythm and atrial flutter, During
atrial fibrillation, correlation decays monotonically with distance an
d the space-constant for this decay may be used to describe the relati
ve spatial organization of atrial fibrillation. We provide examples of
the impact of antiarrhythmic agents on the space-constant and suggest
that assessment of the relative spatial organization of atrial activa
tion using this methodology may potentially provide an objective frame
work to guide therapy in patients with AF.