Spectral analysis of epicardial 60-lead electrograms in dogs with 4-week-old myocardial infarction.
There were few studies on the spectral analysis of multiple-lead epicardial electrograms in chronic myocardial infarction. Spectral analysis of multi-lead epicardial electrograms was performed in 6 sham-operated dogs (N group) and 8 dogs with 4-week-old myocardial infarction (MI group). Four weeks after the ligation of left anterior descending coronary artery, fast Fourier transform was performed on 60-lead epicardial electrograms, and then inverse transform was performed on 5 frequency ranges from 0 to 250 Hz. From the QRS onset to QRS offset, the time integration of unsigned value of reconstructed waveform was calculated and displayed as AQRS maps. On 0-25 Hz AQRS map, there was no significant difference between the 2 groups. In the frequency ranges of 25-250 Hz, MI group had significantly smaller AQRS values than N group solely in the infarct zone. It was shown that high frequency potentials (25-250 Hz) within QRS complex were reduced in the infarct zone.
Department of Nursing, Faculty of Health Science, Yamagata School of Health Science, JApan.yhosoya@yachts.ac.jp
Y
Y
Hosoya
K
K
Ikeda
T
T
Komatsu
M
M
Yamaki
I
I
Kubota
D000818:Animals; D004285:Dogs; D004562:Electrocardiography; D009203:Myocardial Infarction / Q000503:physiopathology*; D013057:Spectrum Analysis