Title :
Intra-QRS analysis of high frequency signal components in patients with congenital heart disease
Author :
Brümmerhof, A. ; Brockmeier, K. ; Schmitz, L. ; Thieme, R. ; Kissenbeck, S. ; Bein, G.
Author_Institution :
Virchow Med. Center, Humboldt-Univ., Berlin, Germany
Abstract :
Patients with congenital heart disease were investigated after operation using the echocardiogram, signal-averaged ECG (SAECG) and Holter ECG. 32 patients, age 13.1 y (5-31 y) and 13 controls, 14.0 y (8-21 y), were compared. Together with Butterworth filtering a second high pass filter (FIR digital filter) was introduced to analyse high frequency components not only at the end of the QRS complex. FIR high pass filtering of the whole QRS showed a significant correlation between impaired left ventricular ejection fraction and more fractionated QRS in the SAECG (p<0.003). No correlation was found between dysrhythmias in the 24-hour Holter ECG and SAECG findings. High frequency intra-QRS signal components seem to be related to functional impairment in patients with congenital heart disease after operation.
Keywords :
Butterworth filters; FIR filters; cardiology; electrocardiography; filtering theory; high-pass filters; medical signal processing; surgery; 24 hour; 5 to 31 year; 8 to 21 year; Butterworth filtering; FIR digital filter; Holter ECG; QRS complex; SAECG; congenital heart disease; controls; dysrhythmias; echocardiogram; functional impairment; high frequency component; high frequency intra-QRS signal components; high frequency signal components; impaired left ventricular ejection fraction; intra-QRS analysis; more fractionated QRS; operation; patients; second high pass filter; signal-averaged ECG; Cardiac disease; Cardiology; Digital filters; Electrocardiography; Filtering; Finite impulse response filter; Fractionation; Frequency; Risk analysis; Signal analysis;
Conference_Titel :
Computers in Cardiology, 1996
Conference_Location :
Indianapolis, IN, USA
Print_ISBN :
0-7803-3710-7
DOI :
10.1109/CIC.1996.542618
