DocumentCode :
473842
Title :
Quantification of phase recurrences in atrioventricular (AV) conduction during atrial arrhythmias
Author :
Masè, M. ; Glass, L. ; Ravelli, F.
Author_Institution :
Dept of Phys., Univ. of Trento, Trento
fYear :
2006
fDate :
17-20 Sept. 2006
Firstpage :
761
Lastpage :
764
Abstract :
In this study we propose a new method to characterize atrioventricular (AV) coupling during atrial arrhythmias, based on the quantification of the recurrences of the AV phase series, which represents the timing of atrial beats with respect to subsequent ventricular beats. Recurrences are quantified in terms of autocorrelation function maximum (R), Shannon Entropy (SE) and synchrogram features (locking ratio LR, presence p and length k of phase-locked epochs). AV phase series obtained during type I and II atrial flutter (AFL1 and AFL2) and atrial fibrillation (AF) showed the existence of significant phase-locked segments, whose presence, length and locking ratios decreased at increasing atrial frequency and complexity (AFL1: R=0.99plusmnO.01, SE=1.13plusmn0.52, p=99.5plusmn0.9%, k=96.3+30.4, LR=0.37plusmn0.15; AFL2: R=0.75plusmnO.01, SE=2.99plusmn0.01, p=57.3+8.8%, k=2.42 + 0.54, LR=0.23+0.02; AF: R=0.77plusmn0.06, SE=2.90+0.25, p=70.8plusmn18.9%, k=2.24plusmn0.29, LR=0.34plusmn0.06). The quantification of AV phase recurrences could have basic as well as clinical applications for understanding AV node dynamics during atrial arrhythmias and characterizing AV pharmacological control.
Keywords :
bioelectric phenomena; cardiology; medical signal processing; patient diagnosis; AFL1; AFL2; AV node dynamics; AV pharmacological control; AV phase series; Shannon entropy; atrial arrhythmias; atrial beat timing; atrial fibrillation; atrioventricular conduction; atrioventricular coupling characterisation; atrioventricular phase recurrence quantification; autocorrelation function maximum; phase locked segments; synchrogram features; type I atrial flutter; type II atrial flutter; ventricular beats; Autocorrelation; Cardiology; Catheters; Character recognition; Entropy; Frequency; Pattern recognition; Physics; Physiology; Timing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Computers in Cardiology, 2006
Conference_Location :
Valencia
Print_ISBN :
978-1-4244-2532-7
Type :
conf
Filename :
4511963
Link To Document :
بازگشت