Effect of high-pass filtering on ECG signal on the analysis of patients prone to atrial fibrillation.
The aim of this study was to assess the effect of filtering techniques on the time-domain analysis of the ECG. Multi-lead ECG recordings obtained from chronic atrial fibrillation (AF) patients after successful external cardioversion have been acquired. Several high-pass filtering techniques and three cut-off frequency values were used: Bessel and Butterworth four-pole and two-pole bidirectional and unidirectional filters, at 0.01, 0.05 and 0.5 Hz low cut-off frequency. As a reference, a beat-by-beat linear piecewise interpolation was used to remove baseline wander, on each P-wave. Results show that ECG filtering affects the estimation of P-wave duration in a manner that depends upon the type of filter used: particularly, the bidirectional filters caused negligible variation of P-wave duration, while unidirectional ones provoked an increase higher than 8%.
Censi
Federica
F
Dipartimento di Tecnologie e Salute, Istituto Superiore di Sanità, Rome, Italy. federica.censi@iss.it
Calcagnini
Giovanni
G
Triventi
Michele
M
Mattei
Eugenio
E
Bartolini
Pietro
P
Corazza
Ivan
I
Boriani
Giuseppe
G
D001281:Atrial Fibrillation / Q000175:diagnosis*; D003627:Data Interpretation, Statistical; D004562:Electrocardiography / Q000295:instrumentation / Q000706:statistics & numerical data*; D004566:Electrodes; D005080:Exercise Test; D006321:Heart / Q000503:physiopathology; D006801:Humans