Gliding window fast Fourier transform analysis--a new method for discovering the contribution of higher frequencies in signal-averaged ECG.
OBJECTIVE
An attempt to detect the 'parasitic contribution' of high frequencies in the electrocardiogram signal.


METHODS
A new method--gliding window fast Fourier transform analysis (GWFFTA)--was developed. It was applied in healthy subjects and in patients with acute myocardial infarction.


METHODS
Faculty of Medicine and University Hospital.


METHODS
The GWFFTA was used in 29 healthy volunteers and in a group of 30 patients with myocardial infarction, on day 7 to 14 after admission to a coronary unit.


METHODS
Noninvasive examination, performed under standard conditions.


RESULTS
GWFFTA provides better reproducible results compared with 'classic' fast Fourier transform analysis. The parasitic contribution of high frequencies within QRS complex and ST segment in patients with acute myocardial infarction is independent of presence or absence of late potentials. Contribution of high frequencies are three times higher in patients with acute myocardial infarction than in healthy probands.


CONCLUSIONS
GWFFTA is a reproducible method of detection of high frequencies during whole heart activation. Contribution of high frequencies in patients with acute myocardial infarction reflects the state of the entire myocardium. It is also confirmed by the lack of correlation with the presence or absence of late potentials. Late potentials are more reflective of focal changes.
Hulin
I
I
Institute of Pathophysiology, Medical School Comenius University, Bratislava, Slovakia.
Slavkovsky
P
P
Hatala
R
R
Petrasova
H
H
Cik
V
V
Murin
J
J
D000200:Action Potentials; D000293:Adolescent; D000328:Adult; D000368:Aged; D016757:Death, Sudden, Cardiac / Q000453:epidemiology / Q000209:etiology; D004562:Electrocardiography / Q000379:methods; D005069:Evaluation Studies as Topic; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications / Q000175:diagnosis* / Q000473:pathology; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted