Non-linear parameters were computed to assess the extent of spatial organization in the atria in terms of coupling/synchronization between electrograms recorded in different atrial sites. Recordings of 9 patients suffering from paroxysmal atrial fibrillation were tested during four clinical experimental conditions: sinus rhythm and atrial fibrillation, both before and after isoproterenol infusion, a drug mimicking adrenergic activation. Two non-linear metrics were investigated: an index of non-linear association (NLA) and a synchronization (S) index based on the cross-conditional entropy. Results evidence the presence of reduced coupling after drug infusion in both sinus rhythm and atrial fibrillation. Moreover, passing from the NLA to the S index, the capability of the parameter to capture the subtle changes due to isoproterenol administration increased.
|Titolo:||Assessment of spatial organization in the atria during paroxysmal atrial fibrillation and adrenergic stimulation|
LOMBARDI, FEDERICO (Penultimo)
|Parole Chiave:||adrenergic stimulation; atrial fibrillation; endocardial recordings; non-linear analysis; synchronization|
|Settore Scientifico Disciplinare:||Settore MED/11 - Malattie dell'Apparato Cardiovascolare|
|Data di pubblicazione:||2006|
|Digital Object Identifier (DOI):||10.1515/BMT.2006.051|
|Appare nelle tipologie:||01 - Articolo su periodico|