Multiresolution wavelet analysis of the body surface ECG before and after angioplasty

1995 ◽  
Vol 23 (5) ◽  
pp. 553-561 ◽  
Author(s):  
Boris Gramatikov ◽  
Sun Yi-chun ◽  
Herve Rix ◽  
Pere Caminal ◽  
Nitish V. Thakor
Keyword(s):  
Wavelet Analysis ◽  
Body Surface ◽  
The Body ◽  
Surface Ecg ◽  
Before And After ◽  
Multiresolution Wavelet Analysis ◽  
Multiresolution Wavelet

Wavelet analysis and time-frequency distributions of the body surface ECG before and after angioplasty

2000 ◽  
Vol 62 (2) ◽  
pp. 87-98 ◽  
Author(s):  
Boris Gramatikov ◽  
Jeffrey Brinker ◽  
Sun Yi-chun ◽  
Nitish V. Thakor
Keyword(s):  
Wavelet Analysis ◽  
Body Surface ◽  
The Body ◽  
Frequency Distributions ◽  
Time Frequency ◽  
Surface Ecg ◽  
Before And After

Enhanced multiresolution wavelet analysis of complex dynamics in nonlinear systems

2021 ◽  
Vol 31 (4) ◽  
pp. 043110 ◽  
Author(s):  
A. N. Pavlov ◽  
O. N. Pavlova ◽  
O. V. Semyachkina-Glushkovskaya ◽  
J. Kurths
Keyword(s):  
Nonlinear Systems ◽  
Wavelet Analysis ◽  
Complex Dynamics ◽  
Multiresolution Wavelet Analysis ◽  
Multiresolution Wavelet

Frequency modulation within electrocardiograms during ventricular fibrillation

2000 ◽  
Vol 279 (2) ◽  
pp. H825-H835 ◽  
Author(s):  
Abhijit Patwardhan ◽  
Sachin Moghe ◽  
Ke Wang ◽  
Fabio Leonelli
Keyword(s):  
Ventricular Fibrillation ◽  
Body Surface ◽  
Dominant Frequency ◽  
The Body ◽  
Frequency Variation ◽  
Refractory Periods ◽  
Analysis Technique ◽  
Before And After ◽  
Average Variation ◽  
Dominant Frequencies

Periods of reentrant activation and effective refractory periods are correlated with dominant frequency or reciprocal of cycle periods during ventricular fibrillation (VF). In the present study, we used an analysis technique based on Wigner transforms to quantify time-varying dominant frequencies in electrocardiograms (ECGs) during VF. We estimated dominant frequencies within orthogonal ECGs recorded in 10 dogs during trials of 10 s of VF and in 9 dogs during trials of 30 s of VF. In four additional dogs, we compared dominant frequencies during 10 s of VF before and after administration of amiodarone. Our results showed the following. 1) There was substantial frequency variation or modulation within the ECGs during 10 and 30 s of VF, the average variation being ±15% from the mean frequency. Amiodarone decreased mean frequencies ( P < 0.05) as expected; however, amiodarone also decreased the variation in frequencies ( P < 0.05). 2) During 30 s of VF, the dominant frequencies increased continuously from 7.3 to 8.1 Hz ( P < 0.05). The increase in frequency was almost linear with a rate of 0.022 Hz/s ( r 2 = 0.93, P < 0.0005). 3) Modulation of frequencies during the first and the last one-half of 30 s of VF was not different. Average (in time) mean frequencies and modulation of frequencies were similar in all three ECGs. 4) Although the averages were similar, during any VF episode, dominant frequencies in ECGs recorded from different locations on the body surface were similar to each other at some times and markedly different from each other at other times. We conclude that during VF, 1) frequencies in ECGs vary considerably and continuously, and amiodarone decreases this variation; 2) mean frequencies increase linearly during first 30 s; 3) the variability in frequency does not change during 30 s; and 4) at any given time, the frequencies within spatially different body surface ECGs can be either similar or markedly different.

scholarly journals Multiresolution wavelet analysis of integer scale Bessel functions

2007 ◽  
Vol 48 (7) ◽  
pp. 073516 ◽  
Author(s):  
S. Albeverio ◽  
P. E. T. Jorgensen ◽  
A. M. Paolucci
Keyword(s):  
Wavelet Analysis ◽  
Bessel Functions ◽  
Multiresolution Wavelet Analysis ◽  
Multiresolution Wavelet
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